Pressure-Induced Successive Phase Transitions and Optical Properties in Lu2SiO5

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-06-02 DOI:10.1002/adpr.202300319
Wenming Qi, Anwar Hushur, Lin He, Rabigul Tursun, Min Gao
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Abstract

Herein, lutecium silicate is used as a rock example to investigate its two high-pressure phases (7.4 GPa: HP-II and 25.3 GPa: HP-III) and lattice dynamics by in situ high-pressure Raman scattering up to 35.1 GPa. The evidence for a highly symmetrical insulator HP-III phase is obtained. Importantly, the high-pressure structure (metastable phases) after pressure quenching is also intercepted, indicating pressure-induced permanent densification. These findings provide Raman evidence for pressure-induced successive phase transitions of highly symmetric insulators intercepted in prototype Lu2SiO5 and physical insights to explain the self-regulation of rare earth-rich regions in facilitating highly effective global carbon cycling.

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Lu2SiO5 中压力诱导的连续相变和光学特性
本文以硅酸镥岩为例,通过高达 35.1 GPa 的原位高压拉曼散射研究其两种高压相(7.4 GPa:HP-II 和 25.3 GPa:HP-III)和晶格动力学。结果证明存在高度对称的绝缘体 HP-III 相。重要的是,还截获了压力淬火后的高压结构(可转移相),表明了压力诱导的永久致密化。这些发现为在原型 Lu2SiO5 中截取高度对称绝缘体的压力诱导连续相变提供了拉曼证据,并为解释富稀土区域在促进高效全球碳循环方面的自我调节提供了物理见解。
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