Experimental determination of thermal expansivity of calcium ferrite-type MgAl2O4 and its application to thermodynamical assessment of thermoelastic parameters

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2024-02-09 DOI:10.1007/s00269-023-01266-1
Hiroshi Kojitani, Mei Gonai, Yoshiyuki Inaguma, Masaki Akaogi
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Abstract

High-temperature X-ray diffraction measurements of calcium ferrite (CF)-type MgAl2O4 were performed in a temperature range of 300–673 K at atmospheric pressure. From temperature dependence of the unit cell volume, thermal expansivity (α) was determined to be α(T) = (2.46 ± 0.13) × 10–5 + (1.2 ± 0.3) × 10–8 T in 1/K. Thermoelastic parameters of isothermal bulk modulus at zero pressure (KT0), its pressure derivative (KT′) and temperature derivative [(∂KT0/∂T)P] of MgAl2O4 CF were optimized by iteration calculation combining the least squares fitting of a third-order Birch–Murnaghan equation of state to previous PVT data with α calculation using the Grüneisen relation equation, α = γthCV/(KT0V) where γth and CV are thermal Grüneisen parameter and isochoric heat capacity, respectively. γth was constrained by the α measured in this study. When pressure data were rescaled by Au equations of state which are different from that adopted in the previous study and temperature data were corrected using pressure dependence of electromotive force of a W–Re thermocouple, KT0, KT′ and (∂KT0/∂T)P were assessed to be 216(4) GPa, 3.9(3) and − 0.027(3) GPa/K, respectively. It was suggested that the optimized α was about 17% lower than that determined by the previous study at 2000 K.

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钙铁氧体型 MgAl2O4 热膨胀率的实验测定及其在热弹性参数热力学评估中的应用
在大气压力下,在 300-673 K 的温度范围内对钙铁氧体(CF)型 MgAl2O4 进行了高温 X 射线衍射测量。根据单位晶胞体积的温度依赖性,热膨胀率 (α)被确定为 α(T) = (2.46 ± 0.13) × 10-5 + (1.2 ± 0.3) × 10-8 T,单位为 1/K。MgAl2O4 CF 的零压等温体积模量(KT0)、其压力导数(KT′)和温度导数[(∂KT0/∂T)P]的热弹性参数是通过迭代计算优化的,该计算将三阶 Birch-Murnaghan 状态方程的最小二乘法拟合与先前的 P-V-T 数据相结合,并使用格吕尼森关系式计算α、α = γthCV/(KT0V) 其中,γth 和 CV 分别为热格鲁尼森参数和等时热容。γth由本研究中测得的α限制。当使用不同于之前研究的 Au 状态方程对压力数据进行重新标定,并使用 W-Re 热电偶的电动势压力依赖性对温度数据进行校正时,KT0、KT′ 和 (∂KT0/∂T)P 分别被评估为 216(4) GPa、3.9(3) 和 - 0.027(3) GPa/K。研究表明,优化后的α比之前在 2000 K 下测定的α低约 17%。
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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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