Phase transitions of LiAlO2 at high pressure and high temperature

被引：56

作者：

Lei, Li ^{[1
]}

He, Duanwei ^{[1
]}

Zou, Yongtao ^{[1
]}

Zhang, Wei ^{[1
]}

Wang, Zhao ^{[1
]}

Jiang, Ming ^{[2
]}

Du, Maolu ^{[2
]}

机构：

[1] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Peoples R China

[2] SW Univ Nationalities, Elect & Informat Engn Dept, Chengdu 610041, Peoples R China

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2008年 / 181卷 / 08期

基金：

中国国家自然科学基金;

关键词：

LiAlO2; high-pressure; phase transition; stable region; preferential orientation;

D O I：

10.1016/j.jssc.2008.04.006

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

This work presents a comprehensive study on phase transitions in LiAlO2 system at high pressures and temperatures (0.5-5.0 GPa and 300-1873 K, respectively), as well as the phase stability for polymeric phases of LiAlO2; in the studied P-T space by X-ray diffraction (XRD). Besides the previously described polymorphic hexagonal alpha-phase, orthorhombic beta-phase and tetragonal delta-phase, a possible new phase of LiAlO2 was observed after the tetragonal gamma-LiAlO2 sample was treated at 5.0 GPa and 389 K. The stable regimes of these high-pressure phases were defined through the observation of coexistence points of the polymeric phases. Our results revealed that LiAlO2 could experience structural phase transitions from gamma-LiAlO2 to its polyrnorphs at lower pressures and temperatures compared to the reported results. Hexagonal alpha-LiAlO2 with highly (003) preferential orientation was prepared at 5.0GPa and 1873 K. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：1810 / 1815

页数：6

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