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| Equation of state of Ca2AlSiO5.5 oxygen defect perovskite | |
| Chaowen Xu; Shuangmeng Zhai; Lijin Ye; Yuji Higo | |
| 2015 | |
| Source Publication | Physics & Chemistry of Minerals
 |
| Volume | 42Issue:4Pages:327-336 |
| Abstract | 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. |
| Keyword | Ca2alsio5.5 Oxygen Defect Perovskite In Situ X-ray Diffraction Equation Of State |
| Subject Area | 地球深部物质与流体作用地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5953 |
| Collection | 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 |
| Recommended Citation 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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