Lee, DY Jang, JW Kim, DJ 2024-01-21T12:36:18Z 2024-01-21T12:36:18Z 2021-09-05 2001-04 0272-8842 https://pubs.kist.re.kr/handle/201004/140586 Tetragonal zirconia polycrystals (TZPs) were prepared with additions of 5.31 mol% Y2O3 plus up to 5 mol% Nb:OS and their existing phases were investigated by Raman spectroscopy and X-ray diffraction, The present study reveals that Raman spectroscopy can identify the existing phases of cubic (c)-, tetragonal (t)-, monoclinic (m)-ZrO2, and Y-Nb ordered phase. The phase stability of t-ZrO2 may be governed by the competition between stable and transformable t-phase as a function of Nb2O5 content. Raman spectra of TZPs exhibit a broad and diffuse peak at around 770 cm(-1) in contrast to the c-. t- and m-phases due to local ordering. The local environment of Nb5+ in this system is maintained throughout Nb2O5 concentrations (0 < Nb2O5 less than or equal to 5 mol%), indicating that the 770 cm(-1) mode is likely to be related to the stable t-phase. (C) 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved. English ELSEVIER SCI LTD TETRAGONAL ZIRCONIA FRACTURE-TOUGHNESS STABILITY Rat-nan spectral characterization of existing phases in the ZrO2-Y2O3-Nb2O5 system Article 10.1016/S0272-8842(00)00079-1 1 CERAMICS INTERNATIONAL, v.27, no.3, pp.291 - 298 CERAMICS INTERNATIONAL 27 3 291 298 scie scopus 000168298300008 2-s2.0-0035063759 Materials Science, Ceramics Materials Science Article TETRAGONAL ZIRCONIA FRACTURE-TOUGHNESS STABILITY tetragonal zirconia polycrystal Y-Nb ordering Raman spectroscopy