High-pressure behavior of gasparite-(Ce) (nominally CeAsO4), a monazite-type arsenate

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

Physics and Chemistry of Minerals Pub Date : 2022-11-15 DOI:10.1007/s00269-022-01222-5

Francesco Pagliaro, Paolo Lotti, Davide Comboni, Tommaso Battiston, Alessandro Guastoni, Patrizia Fumagalli, Nicola Rotiroti, G. Diego Gatta

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Abstract

The high-pressure behavior of the natural arsenate gasparite-(Ce) [Ce_0.43La_0.24Nd_0.15Ca_0.11Pr_0.04Sm_0.02Gd_0.01(As_0.99Si_0.03O₄)] from the Mt. Cervandone mineral deposit (Piedmont Lepontine Alps, Italy), has been studied by in situ single-crystal synchrotron X-ray diffraction up to 22.01 GPa. Two distinct high-pressure ramps have been performed, using a 16:3:1 methanol:ethanol:water solution and helium as P-transmitting fluids, respectively. No phase transition occurs within the pressure range investigated, whereas a change in the compressional behavior has been observed at ~ 15 GPa. A second-order Birch-Murnaghan EoS was fitted to the P-V data, leading to a refined bulk modulus of 109.4(3) GPa. The structural analysis has been carried out on the basis of the refined structure models, allowing the description of the deformation mechanisms accommodating the bulk compression in gasparite-(Ce) at the atomic scale, which is mainly controlled by the compression of the Rare Earth Elements coordination polyhedra, while the AsO₄ tetrahedra behave as a quasi-rigid units. A micro-Raman spectroscopy analysis, performed at ambient conditions, suggests the presence of hydroxyl groups into the structure of the investigated gasparite-(Ce).

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气辉石-(Ce)(名义上为CeAsO4)，一种独居石型砷酸盐的高压行为

用高达22.01 GPa的原位同步x射线衍射研究了意大利皮埃蒙特列pontine阿尔卑斯山脉(Piedmont Lepontine Alps) Cervandone矿床天然砷酸钠气晶-(Ce) [Ce0.43La0.24Nd0.15Ca0.11Pr0.04Sm0.02Gd0.01(as0.99 si0.030 o4)]的高压行为。分别使用16:3:1的甲醇:乙醇:水溶液和氦作为p传输流体，进行了两个不同的高压斜坡。在研究的压力范围内，没有发生相变，而在~ 15 GPa时，观察到压缩行为发生了变化。二阶Birch-Murnaghan EoS与P-V数据拟合，得到了109.4(3)GPa的精细体积模量。在精细化结构模型的基础上进行了结构分析，在原子尺度上描述了气相石-(Ce)体压缩的变形机制，其主要受稀土元素配位多面体的压缩控制，而AsO4四面体则表现为准刚性单元。在环境条件下进行的微拉曼光谱分析表明，在所研究的气辉石-(Ce)的结构中存在羟基。

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)