{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:57:04Z","timestamp":1760151424074,"version":"build-2065373602"},"reference-count":35,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2022,3,16]],"date-time":"2022-03-16T00:00:00Z","timestamp":1647388800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004281","name":"National Science Center","doi-asserted-by":"publisher","award":["2017\/25\/B\/ST5\/01032"],"award-info":[{"award-number":["2017\/25\/B\/ST5\/01032"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>A study is presented on the synthesis of reaction-mixed nitride nanopowders in the reference system of aluminium nitride AlN, gallium nitride GaN, and titanium nitride TiN (Al:Ga:Ti = 1:1:1) followed by their high-pressure and high-temperature sintering towards novel multi-nitride composite nanoceramics. The synthesis starts with a 4 h reflux in hexane of the mixture of the respective metal dimethylamides, which is followed by hexane evacuation, and reactions of the residue in liquid ammonia at \u221233 \u00b0C to afford a mixed metal amide\/imide precursor. Plausible equilibration towards a bimetallic Al\/Ga-dimethylamide compound upon mixing of the solutions of the individual metal-dimethylamide precursors containing dimeric {Al[N(CH3)2]3}2 and dimeric {Ga[N(CH3)2]3}2 is confirmed by 1H- and 13C{H}-NMR spectroscopy in C6D6 solution. The precursor is pyrolyzed under ammonia at 800 and 950 \u00b0C yielding, respectively, two different reaction-mixed composite nitride nanopowders. The latter are subjected to no-additive high-pressure and high-temperature sintering under conditions either conservative for the initial powder nanocrystallinity (650 \u00b0C, 7.7 GPa) or promoting crystal growth\/recrystallization and, possibly, solid solution formation via reactions of AlN and GaN towards Al0.5Ga0.5N (1000 and 1100 \u00b0C, 7.7 GPa). The sintered composite pellets show moderately high mechanical hardness as determined by the Vicker\u2019s method. The starting nanopowders and resulting nanoceramics are characterized by powder XRD, Raman spectroscopy, and SEM\/EDX. It is demonstrated that, in addition to the multi-nitride composite nanoceramics of hexagonal AlN\/hexagonal GaN\/cubic TiN, under specific conditions the novel composite nanoceramics made of hexagonal Al0.5Ga0.5N and cubic TiN can be prepared.<\/jats:p>","DOI":"10.3390\/ma15062200","type":"journal-article","created":{"date-parts":[[2022,3,16]],"date-time":"2022-03-16T22:15:04Z","timestamp":1647468904000},"page":"2200","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Novel Composite Nitride Nanoceramics from Reaction-Mixed Nanocrystalline Powders in the System Aluminum Nitride AlN\/Gallium Nitride GaN\/Titanium Nitride TiN (Al:Ga:Ti = 1:1:1)"],"prefix":"10.3390","volume":"15","author":[{"given":"Mariusz","family":"Drygas","sequence":"first","affiliation":[{"name":"Faculty of Energy and Fuels, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5486-5283","authenticated-orcid":false,"given":"Katarzyna","family":"Lejda","sequence":"additional","affiliation":[{"name":"Faculty of Energy and Fuels, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0145-6475","authenticated-orcid":false,"given":"Jerzy F.","family":"Janik","sequence":"additional","affiliation":[{"name":"Faculty of Energy and Fuels, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1479-828X","authenticated-orcid":false,"given":"Svitlana","family":"Stelmakh","sequence":"additional","affiliation":[{"name":"Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokolowska 29\/37, 01-142 Warszawa, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bogdan","family":"Palosz","sequence":"additional","affiliation":[{"name":"Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokolowska 29\/37, 01-142 Warszawa, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"18865","DOI":"10.1039\/D1NR05092C","article-title":"Precursor chemistry of metal nitride nanocrystals","volume":"13","author":"Parwizian","year":"2021","journal-title":"Nanoscale"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"7770","DOI":"10.1002\/anie.201500591","article-title":"Background Story of the Invention of Efficient InGaN Blue-Light-Emitting Diodes (Nobel Lecture)","volume":"54","author":"Nakamura","year":"2015","journal-title":"Angew. Chem. Int. 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