含12mol%铈的四方氧化锆多晶的变温喇曼散射研究

VARYING TEMPERATURE RAMAN SCATTERING STUDIES OF 12 mol% Ce TETRAGONAL ZIRCONIA POLYCRYSTAL

对含12mol％铈的四方氧化锆多晶耐高温材料从17—505K温度范围进行了50—800cm`(-1)的喇曼散射研究,同时还实测了线膨胀系数随温度的变化。降温时,在165±1K观察到了类四方相向类单斜相的转变,而升温时,在450土2K发生了与之相反的转变。为了探讨该转变的原因,对布里渊区声子凝聚和可能引起的相转变做了较仔细的说明。

Raman scattering studies have been carried out on 12 mol% Ce-Tetragonal Zirconia Poly-crystal over 50-800 cm-1, and a range of temperature 17-505 K, a phase transition was observed from the tetragonal-like to monoclinic-like phase at approximately 165±1 K when the temperature was lowering. The reverse transition occurred at approximately 450±2 K when the temperature was raising.In order to study the reason of this transition, the condensation of the phonons in Brillouin zone and possible phase transition have been carefully discussed.