{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T11:54:09Z","timestamp":1773402849218,"version":"3.50.1"},"reference-count":24,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T00:00:00Z","timestamp":1773360000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Y2O3 is widely used in IR windows and optoelectronics, but its vibrational and spectral properties under La3+ substitutions remain unclear. This work investigates xLa2O3-(1\u2212x)Y2O3 with x = 0\u20130.2 via XRD, SEM, Raman, and IR spectroscopy to address the lack of comprehensive data on structure\u2013property correlations. The solid solution (Y1\u2212xLax)2O3 with 0 \u2264 x &lt; 0.15 was determined. The cell parameter a increases from 10.6113(5) \u00c5 to 10.7116(1) \u00c5 as x increases from 0 to 0.15 according to the Rietveld refinements. Both the Raman spectra and infrared (IR) reflection spectra show that (Y1\u2212xLax)2O3 is a \u201cone-mode\u201d system, in which eight of the 22 theoretical first-order Raman modes and 12 of 16 theoretical IR modes for the (Y1\u2212xLax)2O3 are recognized. A local vibrational mode at approximately 680 cm\u22121 is observed in the Raman spectra as x &gt; 0. The Raman modes and IR modes of (Y1\u2212xLax)2O3 show red shift and obvious peak broadening as x increases, which is caused by the expansion of unit cell and local distortions of the crystal structure. As Y3+ is substituted by La3+, the extinction coefficient \u03ba decreases significantly, which can lead to a lower IR absorption and should be beneficial for the IR window applications.<\/jats:p>","DOI":"10.3390\/ma19061119","type":"journal-article","created":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T09:26:38Z","timestamp":1773393998000},"page":"1119","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vibrational Spectra of the \u201cOne-Mode\u201d (Y1\u2212xLax)2O3 Solid Solution Ceramics"],"prefix":"10.3390","volume":"19","author":[{"given":"Xiao-Yong","family":"Zhang","sequence":"first","affiliation":[{"name":"Institute of Functional Materials, College of Materials Science and Engineering, Xi\u2032an University of Architecture and Technology, Xi\u2019an 710055, China"},{"name":"Zhejiang Zhiyuan Engineering Management Co., Ltd., Hangzhou 311100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wen-Hua","family":"Shu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi\u2019an 710072, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4384-871X","authenticated-orcid":false,"given":"Dong-Yun","family":"Gui","sequence":"additional","affiliation":[{"name":"Institute of Functional Materials, College of Materials Science and Engineering, Xi\u2032an University of Architecture and Technology, Xi\u2019an 710055, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"824","DOI":"10.1111\/jace.13354","article-title":"High Transparency Nd: Y2O3 Ceramics Prepared with La2O3 and ZrO2 Additives","volume":"98","author":"Zhang","year":"2015","journal-title":"J. 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