Preparation and Pressure-Induced Cubic-to-Orthorhombic Phase Transition in ZrW2O8
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摘要: 采用固相烧结法制备了纯度较高的钨酸锆(ZrW2O8)粉体，并利用金刚石对顶压砧(DAC)对其进行了原位高压同步辐射X射线衍射研究。结果表明:在常温下，压力0.27 GPa附近, 晶体的对称性降低, 并发生α-ZrW2O8向γ-ZrW2O8晶体结构相变; 压力3.81 GPa附近，γ-ZrW2O8完全转变为非晶相。通过拟合得到α-ZrW2O8的体弹模量B=(40.0±3.8)GPa，γ-ZrW2O8的体弹模量B=(37.0±3.0)GPa。
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关键词:
- 钨酸锆(ZrW2O8) /
- 负热膨胀 /
- 高压相变 /
- 同步辐射 /
- 体弹模量
Abstract: Negative thermal expansion (NTE) ZrW2O8 powders were prepared by solid-state reaction with ZrO2 and WO3 powders.In situ high-pressure X-ray diffraction measurements for powder ZrW2O8 were performed by using a diamond anvil cell (DAC) with synchrotron radiation facility.The result shows that powder ZrW2O8 is cubic phase with a little WO3.At about 0.27 GPa and room temperature, theα-ZrW2O8 phase transforms into a quenchable orthorhombic structure called the γ phase.Upon further compression, the γ phase becomes amorphous at the pressure of 3.81 GPa.The obtained bulk modulus of α-ZrW2O8 and γ-ZrW2O8 are (40.0±3.8)GPa and (37.0±3.0)GPa. -
图 2 不同压力下钨酸锆同步辐射X射线衍射谱
Figure 2. Synchrotron radiation X-ray diffraction patterns of zirconium tungstate under various pressures
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