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

页码：6 / 10

页数：5

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