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arXiv 0802.0160cond-mat.mtrl-sci
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压力对ABX4掺杂晶体结构和电子性质的影响

Pressure effects on the structural and electronic properties of ABX4 scintillating crystals

Daniel Errandonea, Francisco Javier Manjon

摘要:

在高压和高温下的研究有助于理解固态的物理性质,包括金属,半导体,超导体或矿物等材料。特别是,ABX4膨胀材料的相行为是一个具有挑战性的问题,对其他领域,包括技术应用和地球和行星科学有许多影响。近几年来,关于压力对这些化合物结构和电子性质影响的研究取得了很大进展。特别是,这些化合物所遵循的高压结构序列现在似乎更好地理解,这要归功于最近的实验和理论研究。在这里,我们将审查不同ABX 4结晶材料的相行为的研究。特别是,我们将集中讨论白钨矿结构的正钨酸盐,已被广泛研究高达50 GPa的不同群体所获得的结果。我们还将描述不同的实验技术,同时在高压和高温下获得可靠的数据。随着最近的发展,涉及同步加速器X射线衍射,拉曼散射,从头计算的不同技术的缺点和优点进行了讨论。根据Fukunaga和Yamaoka以及Bastide图,将讨论这些材料的相行为的差异和相似性,旨在提高对其高压行为的实际理解。还将对审查结果可能产生的技术和地球物理影响进行评论。

英文摘要:

Studies at high pressures and temperatures are helpful for understanding the physical properties of the solid state, including such classes of materials as, metals, semiconductors, superconductors, or minerals. In particular, the phase behaviour of ABX4 scintillating materials is a challenging problem with many implications for other fields including technological applications and Earth and planetary sciences. A great progress has been done in the last years in the study of the pressure-effects on the structural and electronic properties of these compounds. In particular, the high-pressure structural sequence followed by these compounds seems now to be better understood thanks to recent experimental and theoretical studies. Here, we will review studies on the phase behaviour of different ABX4 scintillating materials. In particular, we will focus on discussing the results obtained by different groups for the scheelite-structured orthotungstates, which have been extensively studied up to 50 GPa. We will also describe different experimental techniques for obtaining reliable data at simultaneously high pressure and high temperature. Drawbacks and advantages of the different techniques are discussed along with recent developments involving synchrotron x-ray diffraction, Raman scattering, and ab initio calculations. Differences and similarities of the phase behaviour of these materials will be discussed, on the light of the Fukunaga and Yamaoka and the Bastide diagrams, aiming to improve the actual understanding of their high-pressure behaviour. Possible technological and geophysical implications of the reviewed results will be also commented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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