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Evolution of the brewsterite structure at high pressure: A single-crystal X-ray diffraction study
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2018-09-28 , DOI: 10.1016/j.micromeso.2018.09.030
Yurii V. Seryotkin

The structural evolution of natural brewsterite Sr1.30Ba0.66(H2O)10[Al4.00Si12.00O32], compressed in penetrating (water:ethanol 1:4 mixture) and non-penetrating (paraffin) media up to 3.5 GPa, was studied using single-crystal X-ray diffraction data from a diamond-anvil cell. The results clearly demonstrate the absence of pressure-induced hydration in the brewsterite structure. In both media, the behaviour of brewsterite under compression is similar. A nearly isotropic compression of brewsterite up to 2 GPa proceeds through a slight decrease of the framework T–O–T angles. At P > 2 GPa a phase transition occurs, which is evinced by an abrupt volume reduction by about 1%. The structure contracts mainly along the a axis and exhibits almost regular changes along the two other axes. The high-pressure phase is characterized by a doubled c parameter of the unit cell; the space group remains the same as for the initial phase.



中文翻译:

高压下镁橄榄石结构的演化:单晶X射线衍射研究

天然镁橄榄石Sr 1.30 Ba 0.66(H 2 O)10 [Al 4.00 Si 12.00 O 32 ]的结构演变,在高达3.5 GPa的渗透性(水:乙醇1:4混合物)和非渗透性(石蜡)介质中压缩,使用来自金刚石-砧座电池的单晶X射线衍射数据研究了AlN。结果清楚地表明,在镁橄榄石结构中不存在压力诱导的水合作用。在两种介质中,镁橄榄石在压缩下的行为都是相似的。通过略微减小骨架的T–O–T角,可以使镁橄榄石几乎各向同性地压缩至2 GPa。在P > 2 GPa时会发生相变,这可以通过突然减少约1%的体积来证明。该结构主要沿a轴收缩,并沿其他两个轴呈现几乎规则的变化。高压相的特征在于单位晶胞的c参数加倍。空间组与初始阶段相同。

更新日期:2018-09-28
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