Thermal stability, low- and high-temperature behavior of bergslagite, a berylloarsenate member of the gadolinite supergroup

IF 1.2 4区地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physics and Chemistry of Minerals Pub Date : 2025-02-18 DOI:10.1007/s00269-025-01311-1

Anastasiia K. Shagova, Liudmila A. Gorelova, Oleg S. Vereshchagin, Dmitrii V. Pankin, Anatoly V. Kasatkin

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Abstract

Bergslagite, Ca₂Be₂As₂O₈(OH)₂, is one of the only three known berylloarsenate minerals and is a member of the gadolinite supergroup. To date, very little is known about the thermal behavior of beryllium compounds and not much more about arsenates, while the thermal behavior of berylloarsenates (both natural and synthetic) has not been previously studied at all. In this work, the low and high-temperature behavior and thermal stability of bergslagite were studied in situ using single-crystal X-ray diffraction. Besides, its Raman spectrum was obtained and compared to the calculated one. Bergslagite does not undergo a phase transition in the temperature range − 173 to 700 °C, whereas it amorphizes at higher temperatures. The TO₄-based (T = Be, As) framework remains stable, while the CaO₆(OH)₂ polyhedra are slightly expanding. The volume thermal expansion coefficient (32 × 10^− 6 °C^− 1) is comparable with borosilicate / beryllophosphate analogues (30–35 × 10^− 6 °C^− 1). The low thermal stability of bergslagite can be associated with the vacant octahedral position, which is occupied by divalent cations in more thermally stable beryllosilicate analogues.

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绿柱石的热稳定性，低温和高温行为，绿柱石超群的一种绿柱石

Bergslagite, Ca2Be2As2O8(OH)2，是已知的三种绿铍酸盐矿物之一，是钆超群的一员。迄今为止，人们对铍化合物的热行为知之甚少，对砷酸盐的了解也不多，而对松砷酸酯（天然的和合成的）的热行为以前根本没有研究过。本文利用单晶x射线衍射原位研究了贝格泥岩的低温、高温行为和热稳定性。得到了其拉曼光谱，并与计算结果进行了比较。Bergslagite在- 173 ~ 700℃的温度范围内不发生相变，而在更高的温度下则非晶化。to4基（T = Be, As）骨架保持稳定，而CaO6(OH)2多面体略有膨胀。体积热膨胀系数（32 × 10−6°C−1）与硼硅酸盐/绿柱磷酸类似物（30-35 × 10−6°C−1）相当。贝格泥石的低热稳定性可能与空的八面体位置有关，在更热稳定的绿柱石类似物中，八面体位置被二价阳离子占据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics and Chemistry of Minerals 地学-材料科学：综合

CiteScore

2.90

自引率

14.30%

发文量

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)