Substitutions of Zr4+/V5+ for Y3+/Mo6+ in Y2Mo3O12 for Less Hygroscopicity and Low Thermal Expansion Properties

Qiang Ma; Lulu Chen; Heng Qi; Qi Xu; Baohe Yuan; Xiansheng Liu; Lei Xu

doi:10.3390/ma12233945

Substitutions of Zr⁴⁺/V⁵⁺ for Y³⁺/Mo⁶⁺ in Y₂Mo₃O₁₂ for Less Hygroscopicity and Low Thermal Expansion Properties

Materials (Basel). 2019 Nov 28;12(23):3945. doi: 10.3390/ma12233945.

Authors

Qiang Ma¹, Lulu Chen¹, Heng Qi¹, Qi Xu¹, Baohe Yuan¹, Xiansheng Liu², Lei Xu¹

Affiliations

¹ Collage of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
² Henan Key Laboratory of Photovoltaic Materials and Low Dimensional Materials Science Laboratory, Henan University, Kaifeng 475004, China.

Abstract

In this investigation, Zr_xY_2-xV_xMo_3-xO₁₂ (0 ≤ x ≤ 1.4) is developed and the effects of the substitutions of Zr⁴⁺/V⁵⁺ for Y³⁺/Mo⁶⁺ in Y₂Mo₃O₁₂ on the hygroscopicity and thermal expansion property are investigated. For the smaller substitution content (x ≤ 0.5), their crystal structures remain orthorhombic, while there is crystal water still in the lattice. The linear coefficients of thermal expansions (CTEs), for x = 0.1, 0.3, 0.5, and 0.7, are about -4.30 × 10^-6, -0.97 × 10^-6, 0.85 × 10^-6, and 0.77 × 10^-6 K^-1, respectively, from 476 to 773 K, which means that the linear CTE could be changed linearly with the substitution content of Zr⁴⁺/V⁵⁺ for Y³⁺/Mo⁶⁺ in Y₂Mo₃O₁₂. As long as the substitution content reaches x = 1.3/1.4, almost no hygroscopicity and low thermal expansion from room temperature are obtained and are discussed in relation to the crystal structure and microstructure.

Keywords: hygroscopicity; microstructure; substitutions; thermal expansion.

Publication types

Letter