Crystal structure of superhydrous B, a hydrous magnesium silicate synthesized at 1400'C and 20 GPa
Crystal structure of superhydrous B, a hydrous magnesium silicate synthesized at 1400'C and 20 GPa
复制标题
超水 B（一种在 1400C 和 20 GPa 下合成的水合硅酸镁）的晶体结构
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
JoHN B. Penrsn
中科院分区：
文献类型：
--
作者：
Rosnvr;rr;JoHN B. Penrsn
一种独特的硅酸镁Mg，oSiR0，o（OH）0是发现在20 GPa和1400 ℃下稳定的第一个含水相。超水B晶体属正交晶系，空间群为Pnnm，晶格参数a：5.0894（6）A，B：13.968（7）A，c：8.6956（2）A。晶体结构的检查表明，超水B是一系列相关的晶体剪切上的橄榄石型结构。该系列包括先前描述的相B和无水B，它们在较低温度和压力下是稳定的。超水B，这将存在于500和600公里之间，提供了一个可能的车辆运输的HrO在地球上的这个深度。这种物质的脱水可能对地幔过程产生深远的影响。INtnoucrroN发生在
A unique magnesium silicate, Mg,oSirO,o(OH)0, is the first hydrous phase found to be stable at 20 GPa and 1400 'C. Superhydrous B crystallizes in the orthorhombic space group Pnnm with lattice parameters a: 5.0894(6) A, b : 13.968(7) A, and c : 8.6956(2) A. Examination of the crystal structure indicates that superhydrous B is part of a series related by crystallographic shear performed on an olivine-type structure. The series includes previously described phases, B and anhydrous B, which are stable at lower temperatures and pressures. Superhydrous B, which would exist between 500 and 600 km, provides a possible vehicle for transport of HrO to this depth in the Earth. The dehydration of this material may have far-reaching implications for mantle processes. INtnooucrroN occurs at