{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T14:36:26Z","timestamp":1785162986072,"version":"3.55.0"},"reference-count":69,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2024,8,2]],"date-time":"2024-08-02T00:00:00Z","timestamp":1722556800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["52375184"],"award-info":[{"award-number":["52375184"]}]},{"name":"National Natural Science Foundation of China","award":["52205169"],"award-info":[{"award-number":["52205169"]}]},{"name":"National Natural Science Foundation of China","award":["51705082"],"award-info":[{"award-number":["51705082"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>ScAlMgO4 (SCAM), which can be used as an epitaxial substrate material of GaN in power devices, faces the challenge of achieving a high-quality surface by ultra-precision polishing due to its brittle and easily cleaved characteristics, which are closely associated with its mechanical properties. The micromechanical properties of SCAM single crystals were evaluated by nanoindentation and microscratch tests using different indenters. The elastic modulus EIT and the indentation hardness HIT of SCAM obtained by nanoindentation were 226 GPa and 12.1 GPa, respectively. Leaf-shaped chips and the associated step-like planes of SCAM can be found in the severely damaged regime during scratching by Berkovich and Vickers indenters with sharp edges due to the intersection of intense radial and lateral cracks. The fracture toughness (Kc = 1.12 MPa\u00b7m1\/2) of SCAM can be obtained by using a scratch-based methodology for a spherical indenter based on linear elastic fracture mechanics (LEFM) under an appropriate range of applied loads. An optimal expression for calculating the fracture toughness of easily cleaved materials, including SCAM, via the Vickers indenter-induced cracking method using a Berkovich indenter was recommended.<\/jats:p>","DOI":"10.3390\/ma17153811","type":"journal-article","created":{"date-parts":[[2024,8,2]],"date-time":"2024-08-02T09:34:17Z","timestamp":1722591257000},"page":"3811","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Micro\/Nanomechanical Characterization of ScAlMgO4 Single Crystal by Instrumented Indentation and Scratch Methods"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5974-7713","authenticated-orcid":false,"given":"Zifeng","family":"Ni","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China"},{"name":"Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Wuxi 214122, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guomei","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Electromechanical, Wuxi Vocational Institute of Commerce, Wuxi 214153, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingjie","family":"Ji","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2374-7863","authenticated-orcid":false,"given":"Shanhua","family":"Qian","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da","family":"Bian","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9987-9729","authenticated-orcid":false,"given":"Ming","family":"Liu","sequence":"additional","affiliation":[{"name":"Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"963","DOI":"10.1007\/s40042-023-00799-6","article-title":"Structural and electrical characteristics of ultra-thin Si-doped GaN film regrown on patterned GaN\/sapphire","volume":"82","author":"Shin","year":"2023","journal-title":"J. Korean Phys. Soc."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"127107","DOI":"10.1016\/j.jcrysgro.2023.127107","article-title":"Growth of high quality GaN on (0001) 4H-SiC with an ultrathin AlN nucleation layer","volume":"607","author":"Yang","year":"2023","journal-title":"J. Cryst. Growth"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"181101","DOI":"10.1063\/5.0061354","article-title":"GaN-based power devices: Physics, reliability, and perspectives","volume":"130","author":"Meneghini","year":"2021","journal-title":"J. Appl. Phys."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"228","DOI":"10.15541\/jim20220620","article-title":"Research Progress of ScAlMgO4 Crystal: A Novel GaN and ZnO Substrate","volume":"38","author":"Chaoyi","year":"2023","journal-title":"J. Inorg. Mater."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"SC1023","DOI":"10.7567\/1347-4065\/ab06ab","article-title":"Reuse of ScAlMgO4 substrates utilized for halide vapor phase epitaxy of GaN","volume":"58","author":"Ohnishi","year":"2019","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"10726","DOI":"10.1016\/j.ceramint.2017.05.054","article-title":"Elastic stress field model and micro-crack evolution for isotropic brittle materials during single grit scratching","volume":"43","author":"Wang","year":"2017","journal-title":"Ceram. Int."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"717","DOI":"10.1016\/j.precisioneng.2021.07.016","article-title":"Deformation behaviour of soft-brittle polycrystalline materials determined by nanoscratching with a sharp indenter","volume":"72","author":"Huang","year":"2021","journal-title":"Precis. Eng."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"128561","DOI":"10.1016\/j.surfcoat.2022.128561","article-title":"Effect of Ti\/Si and Ti\/TiN\/Si interlayers on the structure, properties, and tribological behavior of an a-C film deposited onto a C17200 copper-beryllium alloy","volume":"441","author":"Santos","year":"2022","journal-title":"Surf. Coat. Technol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"106361","DOI":"10.1016\/j.mtcomm.2023.106361","article-title":"Characterization of friction and wear of phenolic resin matrix composites reinforced by bamboo fibers of alkaline and LaCl3 treatment","volume":"35","author":"Liu","year":"2023","journal-title":"Mater. Today Commun."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"55498","DOI":"10.1021\/acsami.1c15004","article-title":"Activation of mechanophores in a thermoset matrix by instrumented scratch","volume":"13","author":"Davis","year":"2021","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"5132","DOI":"10.1016\/j.ceramint.2019.10.257","article-title":"Effect of sintering temperature on microstructure and mechanical properties of boron nitride whisker reinforced fused silica composites","volume":"46","author":"Duan","year":"2020","journal-title":"Ceram. Int."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1007\/s10338-021-00264-6","article-title":"Determination of the fracture toughness of glasses via scratch tests with a vickers indenter","volume":"35","author":"Liu","year":"2022","journal-title":"Acta Mech. Solida Sin."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"100861","DOI":"10.1016\/j.nme.2020.100861","article-title":"Evaluation of bonding properties by flat indentation method for an EBW joint of RAFM steel for fusion application","volume":"25","author":"Fu","year":"2020","journal-title":"Nucl. Mater. Energy"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"162902","DOI":"10.1016\/j.jallcom.2021.162902","article-title":"Elastic and plastic anisotropy in a refractory high entropy alloy utilizing combinatorial instrumented indentation and electron backscatter diffraction","volume":"896","author":"Raturi","year":"2022","journal-title":"J. Alloys Compd."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"086503","DOI":"10.1088\/2053-1591\/acebbb","article-title":"On determination of elastic modulus and indentation hardness by instrumented spherical indentation: Influence of surface roughness and correction method","volume":"10","author":"Peng","year":"2023","journal-title":"Mater. Res. Express"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"103744","DOI":"10.1016\/j.tafmec.2022.103744","article-title":"A new instrumented spherical indentation test methodology to determine fracture toughness of high strength steels","volume":"124","author":"Yu","year":"2023","journal-title":"Theor. Appl. Fract. Mech."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1016\/j.mssp.2019.04.037","article-title":"Investigation on residual scratch depth and material removal rate of scratching machining single crystal silicon with Berkovich indenter","volume":"100","author":"Ge","year":"2019","journal-title":"Mater. Sci. Semicond. Process."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"109096","DOI":"10.1016\/j.ijmecsci.2024.109096","article-title":"Indentation fracture of 4H-SiC single crystal","volume":"270","author":"Hou","year":"2024","journal-title":"Int. J. Mech. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"367","DOI":"10.5545\/sv-jme.2012.679","article-title":"Effect of scratch velocity on deformation features of C-plane Sapphire during nanoscratching","volume":"59","author":"Feng","year":"2013","journal-title":"Stroj. Vestn. J. Mech. Eng."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"19982","DOI":"10.1016\/j.ceramint.2024.03.124","article-title":"Micromechanical characterization of zirconia and silicon nitride ceramics using indentation and scratch methods","volume":"50","author":"Liu","year":"2024","journal-title":"Ceram. Int."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"120","DOI":"10.1016\/0043-1648(95)06886-4","article-title":"Abrasion and erosion of hard materials related to wear in the abrasive waterjet","volume":"196","author":"Ness","year":"1996","journal-title":"Wear"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"8740","DOI":"10.1364\/AO.400464","article-title":"Distribution model of the surface roughness in magnetorheological jet polishing","volume":"59","author":"Hai","year":"2020","journal-title":"Appl. Opt."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/j.progsolidstchem.2014.09.001","article-title":"Structure-property relationships of YbFe2O4- and Yb2Fe3O7-type layered oxides: A bird\u2019s eye view","volume":"43","author":"Grajczyk","year":"2015","journal-title":"Prog. Solid State Chem."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1016\/0022-4596(89)90203-X","article-title":"Compounds which have InFeO3(ZnO)m-type structures (m = integer)","volume":"81","author":"Kimizuka","year":"1989","journal-title":"J. Solid State Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1016\/j.mseb.2009.02.003","article-title":"Large domain growth of GaN epitaxial films on lattice-matched buffer layer ScAlMgO4","volume":"161","author":"Katase","year":"2009","journal-title":"Mater. Sci. Eng. B"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"205305","DOI":"10.1063\/1.5031024","article-title":"Characterization of the ScAlMgO4 cleaving layer by X-ray crystal truncation rod scattering","volume":"123","author":"Hanada","year":"2018","journal-title":"J. Appl. Phys."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"081103","DOI":"10.1063\/5.0019533","article-title":"Cathodoluminescence and x-ray photoelectron spectroscopy of ScN: Dopant, defects, and band structure","volume":"8","author":"Haseman","year":"2020","journal-title":"APL Mater."},{"key":"ref_28","first-page":"237","article-title":"X-ray photoelectron spectroscopic study of montmorillonite containing exchangeable divalent cations","volume":"80","author":"Seyama","year":"1984","journal-title":"J. Chem. Soc. Faraday Trans. 1 Phys. Chem. Condens. Phases"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1016\/0169-4332(91)90029-J","article-title":"Chemistry of the interface between aluminium and polyethyleneterephthalate by XPS","volume":"47","author":"Bou","year":"1991","journal-title":"Appl. Surf. Sci."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1016\/S0040-6090(00)00924-X","article-title":"Scandia optical coatings for application at 351 nm","volume":"368","author":"Grosso","year":"2000","journal-title":"Thin Solid Film."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"244612","DOI":"10.1360\/SSPMA-2022-0402","article-title":"Scratch responses of ductile materials by instrumented scratch with a spherical indenter under progressive load","volume":"53","author":"Liu","year":"2023","journal-title":"Sci. Sin. Phys. Mech. Astron."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"7901","DOI":"10.1007\/s00289-022-04397-7","article-title":"Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter","volume":"80","author":"Liu","year":"2023","journal-title":"Polym. Bull."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"6092","DOI":"10.1007\/s11665-022-07537-2","article-title":"Effects of Dopants on Scratch Responses of Diamond-Like Carbon Films by Rockwell C Diamond Indenter","volume":"32","author":"Liu","year":"2023","journal-title":"J. Mater. Eng. Perform."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"970","DOI":"10.1520\/JTE20180719","article-title":"Effect of sample tilt on measurement of friction coefficient by constant-load scratch testing of copper with a spherical indenter","volume":"48","author":"Gao","year":"2020","journal-title":"J. Test. Eval."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"9323","DOI":"10.1007\/s11665-022-07787-0","article-title":"Rate and Load Effects on Scratch Behavior of Thermoplastics by Berkovich Indenter","volume":"32","author":"Liu","year":"2023","journal-title":"J. Mater. Eng. Perform."},{"key":"ref_36","first-page":"1136","article-title":"Micromechanical characterization of microwave dielectric ceramic BaO-Sm2O3-5TiO2 by indentation and scratch methods","volume":"12","author":"Liu","year":"2023","journal-title":"J. Adv. Ceram."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s11249-018-1124-9","article-title":"Effects of normal load on the coefficient of friction by microscratch test of copper with a spherical indenter","volume":"67","author":"Gao","year":"2019","journal-title":"Tribol. Lett."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1310","DOI":"10.1016\/j.jngse.2016.09.068","article-title":"Applications of nano-indentation methods to estimate nanoscale mechanical properties of shale reservoir rocks","volume":"35","author":"Liu","year":"2016","journal-title":"J. Nat. Gas Sci. Eng."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"105302","DOI":"10.1088\/2053-1591\/aa8dc3","article-title":"Power law creep of polycarbonate by Berkovich nanoindentation","volume":"4","author":"Gao","year":"2017","journal-title":"Mater. Res. Express"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"034104","DOI":"10.1117\/1.OE.57.3.034104","article-title":"Berkovich nanoindentation of borosilicate K9 glass","volume":"57","author":"Gao","year":"2018","journal-title":"Opt. Eng."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1016\/j.jnoncrysol.2017.09.006","article-title":"Instrumented indentation of fused silica by Berkovich indenter","volume":"475","author":"Gao","year":"2017","journal-title":"J. Non-Cryst. Solids"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s11340-024-01048-y","article-title":"Improvement in Calibration Procedure in Nanoindentation: An Indenter Bluntness Indicator","volume":"64","author":"Chicot","year":"2024","journal-title":"Exp. Mech."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1016\/j.vacuum.2018.03.061","article-title":"Characterization of spherical indenter with fused silica under small deformation by Hertzian relation and Oliver and Pharr\u2019s method","volume":"153","author":"Gao","year":"2018","journal-title":"Vacuum"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"120067","DOI":"10.1016\/j.jnoncrysol.2020.120067","article-title":"A universal function for the description of nanoindentation unloading data: Case study on soda-lime glass","volume":"544","author":"Gong","year":"2020","journal-title":"J. Non-Cryst. Solids"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"735","DOI":"10.1007\/BF00548163","article-title":"The effect of work-hardening upon the hardness of solids: Minimum hardness","volume":"12","author":"Gerk","year":"1977","journal-title":"J. Mater. Sci."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1111\/j.2041-1294.2011.00073.x","article-title":"Novel combined scratch and nanoindentation experiments on soda-lime-silica glass","volume":"3","author":"Bandyopadhyay","year":"2012","journal-title":"Int. J. Appl. Glass Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"4482","DOI":"10.1016\/j.ceramint.2022.09.334","article-title":"Micromechanical properties of Dy3+ ion-doped (LuxY1-x) 3Al5O12 (x= 0, 1\/3, 1\/2) single crystals by indentation and scratch tests","volume":"49","author":"Liu","year":"2023","journal-title":"Ceram. Int."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"905","DOI":"10.1016\/j.wear.2006.01.036","article-title":"On the friction behaviour in nanoscratch testing","volume":"261","author":"Lafaye","year":"2006","journal-title":"Wear"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"30546","DOI":"10.1016\/j.ceramint.2021.07.233","article-title":"Surface generation in high-speed grinding of brittle and tough ceramics","volume":"47","author":"Choudhary","year":"2021","journal-title":"Ceram. Int."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"108311","DOI":"10.1016\/j.ijmecsci.2023.108311","article-title":"Ultrasonic assisted grinding force model considering anisotropy of SiCf\/SiC composites","volume":"250","author":"Ran","year":"2023","journal-title":"Int. J. Mech. Sci."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"101684","DOI":"10.1016\/j.mtcomm.2020.101684","article-title":"Sliding of a diamond sphere on fused silica under ramping load","volume":"25","author":"Liu","year":"2020","journal-title":"Mater. Today Commun."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"203158","DOI":"10.1016\/j.wear.2019.203158","article-title":"Measurement of fracture toughness of copper via constant-load microscratch with a spherical indenter","volume":"444","author":"Zhang","year":"2020","journal-title":"Wear"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"109126","DOI":"10.1016\/j.engfracmech.2023.109126","article-title":"Characterization of bulk metallic glasses by microscratch test under Rockwell C diamond indenter and progressive normal load","volume":"281","author":"Liu","year":"2023","journal-title":"Eng. Fract. Mech."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"447","DOI":"10.1016\/0013-7944(76)90026-6","article-title":"Stress intensity factors for the expansion loaded star crack","volume":"8","author":"Ouchterlony","year":"1976","journal-title":"Eng. Fract. Mech."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1007\/BF00725625","article-title":"A fracture mechanics analysis of indentation-induced Palmqvist crack in ceramics","volume":"2","author":"Niihara","year":"1983","journal-title":"J. Mater. Sci. Lett."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"574","DOI":"10.1111\/j.1151-2916.1980.tb10768.x","article-title":"Elastic\/plastic indentation damage in ceramics: The median\/radial crack system","volume":"63","author":"Lawn","year":"1980","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1007\/BF01729352","article-title":"New formula for indentation toughness in ceramics","volume":"6","author":"Laugier","year":"1987","journal-title":"J. Mater. Sci. Lett."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"1873","DOI":"10.1007\/BF00555296","article-title":"Indentation fracture of WC-Co cermets","volume":"20","author":"Shetty","year":"1985","journal-title":"J. Mater. Sci."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1007\/BF00541038","article-title":"Microfracture beneath point indentations in brittle solids","volume":"10","author":"Lawn","year":"1975","journal-title":"J. Mater. Sci."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"1501","DOI":"10.1007\/BF01233154","article-title":"Elastic\/plastic indentation hardness and indentation fracture toughness: The inclusion core model","volume":"22","author":"Tanaka","year":"1987","journal-title":"J. Mater. Sci."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"2016","DOI":"10.1007\/BF00557479","article-title":"Equilibrium penny-like cracks in indentation fracture","volume":"10","author":"Lawn","year":"1975","journal-title":"J. Mater. Sci."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1111\/j.1151-2916.1976.tb10991.x","article-title":"Fracture toughness determinations by indentation","volume":"59","author":"EVans","year":"1976","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1007\/BF00724706","article-title":"Evaluation of KIc of brittle solids by the indentation method with low crack-to-indent ratios","volume":"1","author":"Niihara","year":"1982","journal-title":"J. Mater. Sci. Lett."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"533","DOI":"10.1111\/j.1151-2916.1981.tb10320.x","article-title":"A critical evaluation of indentation techniques for measuring fracture toughness: I, direct crack measurements","volume":"64","author":"Anstis","year":"1981","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_65","doi-asserted-by":"crossref","unstructured":"Freiman, S. (1979). Fracture Toughness: The Role of Indentation Techniques. Fracture Mechanics Applied to Brittle Materials, ASTM International.","DOI":"10.1520\/STP678-EB"},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"493","DOI":"10.1007\/BF00721938","article-title":"Indentation microfracture in the Palmqvist crack regime: Implications for fracture toughness evaluation by the indentation method","volume":"1","author":"Lankford","year":"1982","journal-title":"J. Mater. Sci. Lett."},{"key":"ref_67","unstructured":"Blendell, J.E. (1979). The Origins of Internal Stresses in Polycrystalline AL2O3 and Their Effects on Mechanical Properties. [Ph.D. Thesis, Massachusetts Institute of Technology]."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"877","DOI":"10.1179\/026708304225017427","article-title":"New developments for fracture toughness determination by Vickers indentation","volume":"20","author":"Chicot","year":"2004","journal-title":"Mater. Sci. Technol."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"291","DOI":"10.1007\/BF00012370","article-title":"Single crystal cleavage of brittle materials","volume":"65","author":"Schultz","year":"1994","journal-title":"Int. J. Fract."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/17\/15\/3811\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T15:28:38Z","timestamp":1760110118000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/17\/15\/3811"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,8,2]]},"references-count":69,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2024,8]]}},"alternative-id":["ma17153811"],"URL":"https:\/\/doi.org\/10.3390\/ma17153811","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,8,2]]}}}