澳大利亚镭山的偏闪闪长石(La)的热演化:再结晶和热膨胀

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ruiqi Chen, Oleg I. Siidra, Valery L. Ugolkov, Vera A. Firsova, Natalia S. Vlasenko, Angel M. Arevalo-Lopez, Marie Colmont, Vladimir N. Bocharov
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引用次数: 0

摘要

除了经济价值之外,大维石及其合成类似物在材料科学领域也有潜在的应用价值。包括大菱锰矿(La)在内的菱锰矿类矿物的独特性质使其成为具有吸引力的高放射性废物(HLW)固定化候选矿物。我们研究了澳大利亚镭山的变质大理石(La)的热演化过程。我们对温度诱导的结晶过程进行了研究,并首次测定了重结晶大理石(RD)的热膨胀系数(TEC)。我们的结果表明,RD 的热膨胀系数相对较低,这表明它具有热物理稳定性。在25-1200 °C的温度范围内,我们得到了大维石(La)的下列TEC:\(\overline{mathrm\{alpha }}\) a = \(\overline{mathrm\{alpha }}\) b = 9.96 (3) × 10-6 ºC-1; \(\overline{mathrm\{alpha }}\) c = 10.79 (4) × 10-6 ºC-1。热膨胀的特征与沿 c 轴层层堆叠的结构特征一致。体积 TEC αV = 24.81 (47)-36.80 (48) × 10-6 ºC-1。与其他用于固定 HLW 的类矿物相相比,戴维石(La)表现出几乎各向同性的热膨胀,并显示出最优越的热性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermal evolution of metamict davidite-(La) from the Radium Hill, Australia: recrystallization and thermal expansion

Thermal evolution of metamict davidite-(La) from the Radium Hill, Australia: recrystallization and thermal expansion

Thermal evolution of metamict davidite-(La) from the Radium Hill, Australia: recrystallization and thermal expansion

Aside from its economic value, davidite and its synthetic analogs may have potential applications in materials science. The unique properties of the crichtonite group minerals, including davidite-(La), make them attractive candidates for high-level waste (HLW) immobilization. We studied the thermal evolution of the metamict davidite-(La) from the Radium Hill, Australia. The investigation of the temperature-induced crystallization process was conducted, and the thermal expansion coefficients (TEC) for the recrystallized davidite (RD) were determined for the first time. Our results demonstrate that RD has relatively low TEC indicating its thermophysical stability. The following TECs of davidite- (La) for the temperature range 25–1200 °C were obtained: \(\overline{\mathrm{\alpha }}\) a = \(\overline{\mathrm{\alpha }}\) b = 9.96 (3) × 10–6 ºC−1; \(\overline{\mathrm{\alpha }}\) c = 10.79 (4) × 10–6 ºC−1. The character of the thermal expansion is in agreement with the structure characterized by layers stacked along the c axis. The volume TEC αV = 24.81 (47)—36.80 (48) × 10–6 ºC−1. Davidite-(La) exhibits an almost isotropic thermal expansion and shows one of the most superior thermal performances in comparison to the other mineral-like phases utilized for the immobilization of HLW.

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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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