{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T16:07:41Z","timestamp":1790698061468,"version":"4.1.0"},"reference-count":52,"publisher":"American Chemical Society (ACS)","issue":"38","license":[{"start":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T00:00:00Z","timestamp":1789516800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000183","name":"Army Research Office","doi-asserted-by":"publisher","award":["W911NF-23-2-0145"],"award-info":[{"award-number":["W911NF-23-2-0145"]}],"id":[{"id":"10.13039\/100000183","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,29]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Rare earth oxide phosphates (oxyphosphates), with extended metal-oxygen-phosphate bonding networks and a high rare-earth metal-to-phosphorus ratio (RE\/P &amp;gt; 1), are promising materials for thermal and environmental barrier coatings in aircraft, rockets, and hypersonic vehicles because of their refractory properties. However, challenges such as complex crystal chemistry, phase purity control, and the absence of reliable phase diagrams due to a lack of thermodynamic data complicate their application. We synthesized a full series of rare-earth oxyphosphates with composition RE3O3(PO4), using both a well-established solid-state reaction route and two different solution combustion synthesis procedures. Synthesized materials were analyzed with powder X-ray diffraction (PXRD), FTIR spectroscopy, and Raman spectroscopy to probe phase assemblages, bonding environments, and local coordination changes. We synthesized Yb3O3(PO4) and Lu3O3(PO4), which have not been previously synthesized according to the literature, thereby extending the number of experimentally confirmed compounds with these structures. Additionally, all oxide-phosphates described here exhibit excellent thermal stability up to at least 1100 \u00b0C. However, \u03b1-La3O3(PO4) undergoes a phase transformation to \u03b2-La3O3(PO4) at (972 \u00b1 5) \u00b0C, with a phase transition enthalpy of \u0394trH = (10 \u00b1 4) kJ\u00b7mol\u20131. To obtain information on the thermodynamic stability of the RE3O3(PO4) series, we experimentally determined their enthalpy of dissolution using oxide melt drop solution calorimetry at 800 \u00b0C in a 3 Na2O\u00b74 MoO3 solvent. We then calculated their enthalpy of formation using thermodynamic cycles from the respective reactions of rare-earth orthophosphates (REPO4) and rare-earth sesquioxides (RE2O3) at 25 \u00b0C. These thermodynamic data will be useful for phase diagram calculations (CalPhaD) and for assessing the phase equilibria data of RE2O3\u2013P2O5 systems. Thus, it paves the way for future research in utilizing this exotic class of rare earth metal oxide-phosphate materials in demanding energy, catalysis, and sensing sectors.<\/jats:p>","DOI":"10.1021\/acsomega.6c08162","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T13:02:07Z","timestamp":1789563727000},"page":"58198-58208","source":"Crossref","is-referenced-by-count":0,"title":["Thermochemistry of RE3O3(PO4) Rare\nEarth Oxide-Phosphates"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-2604-4887","authenticated-orcid":true,"given":"Konrad","family":"Burkmann","sequence":"first","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jared","family":"Matteucci","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Godwin A.","family":"Agbanga","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Kelly","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohit","family":"Verma","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8184-8884","authenticated-orcid":true,"given":"Sergey V.","family":"Ushakov","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5805-1466","authenticated-orcid":true,"given":"Robert","family":"Glaum","sequence":"additional","affiliation":[{"name":"Rheinische Friedrich-Wilhelms-Universita\u0308t Bonn , , Gerhard-Domagk-Stra\u00dfe 1 , ,","place":["Bonn, Germany, 53121"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0802-2709","authenticated-orcid":true,"given":"Jun","family":"Wu","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongwu","family":"Xu","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth J.","family":"Opila","sequence":"additional","affiliation":[{"name":"University of Virginia , , , ,","place":["Charlottesville, Virginia, United States, 22903"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3260-0364","authenticated-orcid":true,"given":"Alexandra","family":"Navrotsky","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,16]]},"reference":[{"issue":"3","key":"2026092911103554500_cit1","first-page":"337","article-title":"Traitements thermiques des orthophosphates\nde lanthanides LnPO4 et formation de nouveaux compose\u0301s\n(oxyphosphates)","volume":"8","author":"Serra","year":"1976","journal-title":"High Temp. 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Solid State Chem."},{"issue":"23","key":"2026092911103554500_cit46","doi-asserted-by":"publisher","first-page":"9964","DOI":"10.1039\/D4DT01086H","article-title":"Raman spectroscopic\nstudy of anhydrous and hydrous REE phosphates, oxides, and hydroxides","volume":"53","author":"Hurtig","year":"2024","journal-title":"Dalton Trans."},{"issue":"1","key":"2026092911103554500_cit47","doi-asserted-by":"publisher","first-page":"2","DOI":"10.1002\/jrs.1253","article-title":"Correlation\nbetween Raman wavenumbers\nand PO bond lengths in crystalline inorganic phosphates","volume":"36","author":"Popovic\u0301","year":"2005","journal-title":"J. Raman Spectrosc."},{"key":"2026092911103554500_cit48","doi-asserted-by":"publisher","first-page":"81","DOI":"10.1016\/j.saa.2012.08.033","article-title":"Vibrational spectra\nand factor group analysis of M0.50TiOPO4 oxyphosphates\n(M = Mg, Zn, Ni, Co, Fe and Cu)","volume":"99","author":"Eddahaoui","year":"2012","journal-title":"Spectrochim.\nActa, Part A"},{"key":"2026092911103554500_cit49","unstructured":"BIPM; IEC; IFCC; ILAC; ISO; IUPAC; IUPAP; OIML.\n          . Evaluation of measurement data - Guide to the expression of uncertainty\nin measurement; JCGM 100:2008. 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