Negative Thermal Expansion of (ZrMg) xY2–2xMo3O12 Ceramics with Low Hygroscopicity

Xianli Wang; Linjie Fu; Kun Xu; Peng Yang; Xiansheng Lu; Erjun Liang

doi:10.1007/s11595-020-2226-4

Journal of Wuhan University of Technology Materials Science Edition ›› 2020, Vol. 35 ›› Issue (1) : 53 -56. DOI: 10.1007/s11595-020-2226-4

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Negative Thermal Expansion of (ZrMg)_xY_2–2xMo₃O₁₂ Ceramics with Low Hygroscopicity

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Abstract

(ZrMg)_xY_2–2xMo₃O₁₂ (x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1) ceramics have been synthesized to obtain less hygroscopicity and negative thermal expansion. With increasing the substitution of (ZrMg)⁶⁺ (ion radius 7.2 ×10^–11 m) for Y³⁺ (ion radius 9×10⁻¹¹ m), the crystal water are reduced obviously. The linear thermal expansion coeffcient is improved with increasing the content of (ZrMg)⁶⁺. The material shows near zero thermal expansion (−0.12×10⁻⁶ K⁻¹, 430–870 K) with x=0.7. Meanwhile, ZrMgMo₃O₁₂ shows low non-hygroscopicity and negative thermal expansion, but low softening temperature. After substituting amount of Y³⁺ for (ZrMg)⁶⁺ in ZrMgMo₃O₁₂ (x=0.8), the softening temperature increases remarkably (750 K to 830 K) and it presents near zero thermal expansion.

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negative thermal expansion / hygroscopicity / raman spectroscopy / ceramics

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Xianli Wang, Linjie Fu, Kun Xu, Peng Yang, Xiansheng Lu, Erjun Liang. Negative Thermal Expansion of (ZrMg)_xY_2–2xMo₃O₁₂ Ceramics with Low Hygroscopicity. Journal of Wuhan University of Technology Materials Science Edition, 2020, 35(1): 53-56 DOI:10.1007/s11595-020-2226-4

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