Concentration- and Temperature-Induced Phase Transitions in PrAlO3–SrTiO3 System
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- 作者：Leonid Vasylechko ; Roman Stepchuk ; Yuri Prots ; Helge Rosner
- 关键词：Perovskite aluminates and titanates ; Crystal structure ; Solid solution ; Phase transitions ; 61 ; 61.05.cp ; 64.70.K
- 刊名：Nanoscale Research Letters
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：11
- 期：1
- 全文大小：1,247 KB
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Roman Stepchuk (1)
Yuri Prots (2)
Helge Rosner (2)
1. Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine
2. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187, Dresden, Germany - 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
- 出版者：Springer US
- ISSN：1556-276X
文摘
Single-phase mixed aluminates-titanates Pr1−x Sr x Al1−x Ti x O3 (x = 0.1, 0.2, 0.3, 0.5, 0.7) with rhombohedral perovskite structure were prepared by solid-state reaction technique at 1823–1873 K. Morphotropic rhombohedral-to-cubic phase transition in Pr1−x Sr x Al1−x Ti x O3 series is predicted to occur at x = 0.88. The temperature-induced structural phase transition R \( \overline{3} \) с − Pm \( \overline{3} \) m in Pr0.5Sr0.5Al0.5Ti0.5O3, detected at 930 K by in situ high-temperature X-ray synchrotron powder diffraction, occurs at considerably lower temperature as the corresponding transformation in the parent compound PrAlO3 (1770 K). Such remarkable drop of the transition temperature is explained by gradual decrease of the perovskite structure deformation in the Pr1−x Sr x Al1−x Ti x O3 series with increasing Sr and Ti contents as a consequence of the increasing Goldschmidt tolerance factor. For Pr0.3Sr0.7Al0.3Ti0.7O3 phase, a sequence of the low-temperature phase transformation R \( \overline{3} \) с − Immb(C2/m) − I4/mcm was detected. Keywords Perovskite aluminates and titanates Crystal structure Solid solution Phase transitions