高压高温下的橄榄石和 Ni2SiO4 尖晶石的拉曼光谱研究:镍对橄榄石和尖晶石结构振动特性的影响

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2024-08-26 DOI:10.1007/s00269-024-01295-4
Shuchang Gao, Jinpu Liu, Hang Cheng, Li Zhang, Yanhao Lin, Xiaoguang Li, Xueqing Qin
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引用次数: 0

摘要

分别在 22 GPa 和 700 ℃ 的高压和高温条件下,对合成的菱镁矿和 Ni2SiO4 尖晶石进行了高压和高温拉曼光谱测量。根据观测到的拉曼模式计算了等温和等压模式格吕尼森参数。此外,还评估了菱镁矿和 Ni2SiO4 尖晶石的本征非谐波性。Ni2SiO4 尖晶石的非对称 SiO4 伸展带的频率变化在减压下是不可逆的,这表明在高压下晶体结构可能会因压力而发生改变。等温模式格吕尼森参数值表明,富镍橄榄石中的 SiO4 内部振动对压力变化更为敏感。对于尖晶石类矿物,由于镍的加入,SiO4 内部振动对压力变化的敏感性较低。相反,根据等压模式格吕尼森参数值,镍会增加这些振动对温度变化的敏感性。此外,镍对橄榄石和尖晶石族矿物中不同振动模式的固有非谐波性具有独特的影响,从而改变了其晶体结构的热力学性质。
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Raman spectroscopic study of liebenbergite and Ni2SiO4 spinel at high pressure and high temperature: nickel effects on the vibration properties of olivine and spinel structures

High-pressure and high-temperature Raman spectroscopic measurements of synthetic liebenbergite and Ni2SiO4 spinel have been conducted up to 22 GPa and 700 ℃, respectively. Isothermal and isobaric mode Grüneisen parameters were calculated based on the observed Raman modes. The intrinsic anharmonicities of liebenbergite and Ni2SiO4 spinel were also evaluated. The changes of the asymmetric SiO4 stretching band of Ni2SiO4 spinel in frequency are irreversible under decompression, indicating a potential pressure-induced modification in the crystal structure at elevated pressures. The values of isothermal mode Grüneisen parameters show that the SiO4 internal vibrations in Ni-rich olivines are more sensitive to the variations of pressure. For spinel-group minerals, the SiO4 internal vibrations can be less sensitive to the pressure change due to nickel incorporation. In contrast, according to the values of isobaric mode Grüneisen parameters, nickel increases the sensitivity of these vibrations to the variations of temperature. In addition, nickel has distinctive effects on the intrinsic anharmonicities of different vibration modes in both olivine and spinel-group minerals, and therefore alter the thermodynamic properties of their crystal structures.

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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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