Equation of state of Ca2AlSiO5.5 oxygen defect perovskite

	Equation of state of Ca2AlSiO5.5 oxygen defect perovskite
	Chaowen Xu; Shuangmeng Zhai; Lijin Ye; Yuji Higo
	2015
发表期刊	Physics & Chemistry of Minerals
卷号	42 期号:4 页码:327-336
摘要	The elastic properties of synthetic low-pressure and high-pressure Ca2AlSiO5.5 oxygen defect perovskites were investigated by in situ X-ray diffraction in a large-volume high-pressure apparatus. The P-V-T data were collected up to 22.75 GPa at room temperature, up to 12.88 GPa and 1,300 K for low-pressure phase and up to 25.76 GPa at room temperature for high-pressure phase. The P-V data at room temperature were fitted using a third-order Birch-Murnaghan equation of state to obtain K (0) = 146.1(9) GPa and = 3.64(9) for the monoclinic low-pressure phase, and K (0) = 150.4(19) GPa and = 3.16(23) for the rhombohedral high-pressure phase. If was fixed at 4.0, the isothermal bulk moduli were obtained as 142.6(3) and 144.0(8) GPa for low-pressure and high-pressure phase, respectively. Both the low-pressure and high-pressure Ca2AlSiO5.5 oxygen defect perovskites are much softer than pure CaSiO3 perovskite. The P-V-T data of low-pressure phase were fitted by the high-temperature Birch-Murnaghan equation of state to get thermoelastic properties as V (0) = 827.0(3) a"<<(3), K (T) = 146.8(22) GPa, = 3.55(21), (a,K (T) /a,T)(P) = -0.037(2) GPa/K and alpha (T) = 7.67(20) x 10(-5) - 3.20(30) x 10(-8) T. Based on the results, the density profiles of low-pressure and high-pressure Ca2AlSiO5.5 oxygen defect perovskites were calculated and compared with those of some mantle silicate minerals to discuss the potential occurrence of Ca2AlSiO5.5 oxygen defect perovskite in the Earth's interior.
关键词	Ca2alsio5.5 Oxygen Defect Perovskite In Situ X-ray Diffraction Equation Of State
学科领域	地球深部物质与流体作用地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5953
专题	地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
推荐引用方式 GB/T 7714	Chaowen Xu,Shuangmeng Zhai,Lijin Ye,et al. Equation of state of Ca2AlSiO5.5 oxygen defect perovskite[J]. Physics & Chemistry of Minerals,2015,42(4):327-336.
APA	Chaowen Xu,Shuangmeng Zhai,Lijin Ye,&Yuji Higo.(2015).Equation of state of Ca2AlSiO5.5 oxygen defect perovskite.Physics & Chemistry of Minerals,42(4),327-336.
MLA	Chaowen Xu,et al."Equation of state of Ca2AlSiO5.5 oxygen defect perovskite".Physics & Chemistry of Minerals 42.4(2015):327-336.

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