Negative thermal expansion property of Zn2V1.7P0.3O7

被引：16

作者：

Zhu, Yanwen ^{[1
]}

Chen, Rui ^{[1
]}

Chen, Lu ^{[1
]}

Chao, Mingju ^{[1
]}

Guo, Juan ^{[1
]}

Gao, Qilong ^{[1
]}

Liang, Erjun ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Phys & Microelect, Minist Educ, Key Lab Mat Phys, Zhengzhou 450052, Peoples R China

来源：

SOLID STATE SCIENCES | 2021年 / 112卷

基金：

中国国家自然科学基金;

关键词：

Negative thermal expansion; Zn2V1.7P0.3O7; Coefficient of thermal expansion; Rietveld refinement; Raman spectrum; Thermal shrinkage mechanism;

D O I：

10.1016/j.solidstatesciences.2020.106515

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A novel negative thermal expansion material of Zn2V1.7P0.3O7 is prepared using a solid-state method. Its phase, microstructure, thermal expansion property, and Raman spectra are analyzed in detail. Experimental results show that Zn2V1.7P0.3O7 exhibits excellent negative expansion characteristics with an expansion coefficient of -4.47 x 10(-6) K-1 in a wide temperature range of RT-673 K. The underlying mechanism of the negative thermal expansion of Zn2V1.7P0.3O7 is as follows. The distorted [ZnO5] trigonal bipyramides and [V2O7] structural units with staggered Cs symmetry (part of which V is replaced by P) in Zn2V1.7P0.3O7 are connected by sharing O-2 and O-3 atoms to form a chain, such that the sample has a layered staggered structure. The lateral vibration of the O-3 atoms and the coupling twist and rotation effect of [ZnO5] and [VO4] polyhedrons intensify, causing angles between Zn-O-3(long)-V and Zn-O-3(short)-V to decrease gradually. The gap between the inner layers of unit cell is gradually reduced, and the volume of Zn2V1.7P0.3O7 shrinks slowly.

引用

页数：8

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