中国物理B ›› 2018, Vol. 27 ›› Issue (4): 47402-047402.doi: 10.1088/1674-1056/27/4/047402
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Lei Liu(刘雷), Li Yi(易丽), Hong Liu(刘红), Ying Li(李营), Chun-Qiang Zhuang(庄春强), Long-Xing Yang(杨龙星), Gui-Ping Liu(刘桂平)
Lei Liu(刘雷)1,2, Li Yi(易丽)1, Hong Liu(刘红)1, Ying Li(李营)1,2, Chun-Qiang Zhuang(庄春强)3, Long-Xing Yang(杨龙星)1, Gui-Ping Liu(刘桂平)1
摘要: The structures and elasticities of phase B silicates with different water and iron (Fe) content are obtained by first-principles simulation to understand the effects of water and Fe on their properties under high pressure. The lattice constants a and b decrease with increasing water content. On the contrary, c increases with increasing water content. On the other hand, the b and c decrease with increasing Fe content while a increases with increasing Fe content. The decrease of M (metal)-O octahedral volume is greater than the decrease of SiO polyhedral volume over the same pressure range. The density, bulk modulus and shear modulus of phase B increase with increasing Fe content and decrease with increasing water content. The compressional wave velocity (Vp) and shear wave velocity (Vs) of phase B decrease with increasing water and Fe content. The comparisons of density and wave velocity between phase B silicate and the Earth typical structure provide the evidence for understanding the formation of the X-discontinuity zone of the mantle.
中图分类号: (Raman and optical spectroscopy)