The bismuth orthotantalate with high anisotropic thermal expansion

被引：10
|
作者：
Zhuk, N. A. [1 ]
Krzhizhanovskaya, M. G. [2 ]
Belyy, V. A. [3 ]
Sekushin, N. A. [3 ]
Chichineva, A., I [1 ]
机构：
[1] Syktyvkar State Univ, Oktjabrskij Prospect 55, Syktyvkar 167001, Republic Of Kom, Russia
[2] St Petersburg State Univ, Inst Earth Sci, Dept Crystallog, Univ Emb 7-9, St Petersburg 199034, Russia
[3] Inst Chem Komi Sci Ctr UB RAS, Pervomayskaya St 48, Syktyvkar 167982, Republic Of Kom, Russia
来源：
SCRIPTA MATERIALIA | 2019年 / 173卷
关键词：
Phase transformations; Thermal expansion; X-ray diffraction (XRD); Differential scanning calorimetry (DSC); PHASE-TRANSFORMATIONS; NEUTRON-DIFFRACTION; BITAO4; BINBO4; CERAMICS; STABILITY; TENSOR;
D O I：
10.1016/j.scriptamat.2019.07.039
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The triclinic phase of the bismuth orthotantalate (beta-BiTao(4)) exhibited strong anisotropy of thermal expansion in the temperature range of 25-750 degrees C. The character of the thermal expansion of beta-BiTao(4) changed radically near 200 degrees C, which was not observed in its isomorphic analog (beta-BiNbo(4)). In the same temperature range the electrical properties also exhibited the local extremum. Crystal structure of beta-BiNbo(4) was refined at 25, 200, 400 and 600 degrees C from powder X-ray diffraction data. The role of bismuth lone-electron pair is discussed. beta-BiTaO4 has a potential to be used as a thermal expansion material. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6 / 10
页数：5
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