材料科学
共振超声光谱学
钙钛矿(结构)
八面体
相(物质)
锆酸盐
锆钛酸铅
大气温度范围
固溶体
放松(心理学)
钛酸锶
相变
锶
热力学
结晶学
凝聚态物理
陶瓷
钛酸酯
铁电性
晶体结构
薄膜
化学
复合材料
冶金
物理
纳米技术
电介质
弹性模量
光电子学
心理学
社会心理学
有机化学
作者
Ruth E. A. McKnight,B. W. Kennedy,Qi-Lin Zhou,M. P. Carpenter
标识
DOI:10.1088/0953-8984/21/1/015902
摘要
The sequence of phase transitions due to octahedral tilting across the Sr(Zr,Ti)O(3) solid solution series has been investigated by resonant ultrasound spectroscopy at high and low temperatures using ceramic samples. The elastic behaviour associated with phase transitions as a function of composition in Sr(Zr,Ti)O(3) at room temperature is proposed to be analogous to that as a function of temperature in SrZrO(3), with the [Formula: see text] transition at SrZr(0.57)Ti(0.43)O(3), [Formula: see text] at SrZr(0.35)Ti(0.65)O(3), and [Formula: see text] at SrZr(0.05)Ti(0.95)O(3). Changes in elastic constants and acoustic dissipation with temperature have been analysed for samples across the compositional range. The intermediate phases, I4/mcm and what is assumed to be Imma, appear to have stability fields across the full compositional range and both show large dissipation effects, most probably due to twin wall mobility. In contrast, the Zr-rich Pnma phase, which should contain transformation twin walls, is an unexpectedly stiff and non-dissipating material, similar to the high temperature and/or Ti-rich [Formula: see text] phase. In the case of Pnma, this is attributed to coupling between the two order parameters, which could impede relaxation responses to an applied stress. The [Formula: see text] structure is a classically stiff cubic perovskite and no transformation-related dissipation processes are expected.
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