Research on the Al³⁺，V⁵⁺ Double Ionic Substitute Negative Thermal Expansion Compound Zr_1-xAl_xMoW_1-yV_yO₈

Abstract:

The ZrW₂O₈ family of materials has been shown to display the unusual property of an isotropic bulk contraction in volume with the rising of temperature. They have a number of potential applications, for example, they would be widely used in composite material and solid electrolyte based on its characteristic of negative thermal expansion and ionic conductive property. In this paper, an Al³⁺，V⁵⁺ double substitute negative thermal expansion (NTE) solid solution Zr_1-xAl_xMoW_1-yV_yO₈ was synthesized by co-precipitation method. The phase composition, the micromorphology and the thermal expansion coefficient were obtained by using X-ray diffraction (XRD), scanning electronic microscope (SEM) and thermal mechanical analyzer (TMA), respectively. The results show that the sample’s density rises with the increasing of the content of V⁵⁺, while, its porosity declines. The thermal expansion coefficients of the samples are between -3.0~4.0×10-6 K^-1, it indicates that their negative thermal expansion behavior is a little lower than that of ZrMoWO₈. And the experiment also shows that these samples have displayed a fine behavior of heat shock resistance.

• Periodical: Materials Science Forum (Volume 689)
• Pages: 407-412
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.689.407
• Online since: June 2011
• Authors: Shao Hua Shen, Xian Zhi Qin, Shao Bin Xiang, Fu Heng Hao, Jing Tan, Qiu Guo Xiao
• Keywords: Double Ionic Substitute, Negative Thermal Expansion

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