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Hexagonal to cubic phase transition in YH3 under high pressure

机译:高压下YH3的六方相向立方相变

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X-ray diffraction studies on bulk yttrium trihydride, in a diamond anvil cell, have been carried out up to 25 GPa. Pressure induced hexagonal-to-cubic phase transformation in YH3 has been found at pressure of about 8 GPa. The lattice parameter of the new cubic phase was determined as equal to 5.28 A. This finding confirms the theoretical predictions based on first principle calculations of such a transformation. Equations of state have been determined for both the hexagonal hcp and cubic fcc YH3 phases. As compared to the pure yttrium metal, bulk modulus for YH3 is about four times bigger. The similarity of this transition to that observed in the other 4-f trivalent hydrides has been discussed. (C) 2004 Elsevier Ltd. All rights reserved.
机译:在高达25 GPa的金刚石砧座中,对块状三氢化钇进行了X射线衍射研究。在约8 GPa的压力下,发现YH3中压力引起的六方相到立方相变。确定新立方相的晶格参数等于5.28A。这一发现证实了基于这种变换的第一原理计算的理论预测。已经确定了六方六方晶系hcc和立方fcc YH3相的状态方程。与纯钇金属相比,YH3的体积模量大约大四倍。已经讨论了该转变与在其他4-f三价氢化物中观察到的转变的相似性。 (C)2004 Elsevier Ltd.保留所有权利。

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