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

更新时间:2023-05-28

【摘要】(ZrMg)xY2-2xMo3O12（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 coefficient 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, Zr Mg Mo3O12 shows low non-hygroscopicity and negative thermal expansion, but low softening temperature. After substituting amount of Y3+ for（Zr Mg）6+ in Zr Mg Mo3O12（x=0.8）, the softening temperature increases remarkably（750 K to 830 K） and it presents near zero thermal expansion.

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