关键词: 双离子替代/
晶格结构畸变/
近零膨胀/
ZrV2O7
English Abstract
Substitutions of dual-ion Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7 for realizing near-zero thermal expansion
Yuan Bao-He1,5,Cao Wen-Si1,
Ge Xiang-Hong2,5,
Cheng Yong-Guang3,5,
Liu Xian-Sheng4,
Liang Er-Jun5
1.North China University of Water Resources and Electric Power, Zhengzhou 450011, China;
2.College of Science, Zhongyuan University of Technology, Zhengzhou 450007, China;
3.College of Science, Center of Analysis and Testing of Henan Institute of Engineering, Zhengzhou 451191, China;
4.Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, China;
5.School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 11574276).Received Date:28 November 2016
Accepted Date:11 January 2017
Published Online:05 April 2017
Abstract:Zr1-xAlxV2-xMoxO7 (0 x 0.9) is developed by the solid state method, and the near-zero thermal expansion is realized by adjusting the quantity of substitution of Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7. For smaller x values (x 0.3), the samples remain the same cubic structure as that of ZrV2O7. The Coulomb interaction between (Al/Zr)- and (Mo/V)+ increases gradually with increasing the quantity of dual-ion substitution of Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7, which reduces the fraction of the distortionless cubic structure in the sample. For x 0.7, the cubic structures could not be found. For Zr0.5Al0.5V1.5Mo0.5O7, near-zero thermal expansion is obtained in a temperature range from 425 to 750 K (-0.3910-6 K-1). The mechanism of low thermal expansion of Zr0.5Al0.5V1.5Mo0.5O7 could relate to the distortion of crystal structure due to partial substitution of Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7 and the effect of the substitution on the unsubstituted lattice.
Keywords: dual-ion substitutions/
distortion of lattice/
mear-zero thermal expansion/
ZrV2O7
