TY - JOUR

T1 - Evolution of the brewsterite structure at high pressure

T2 - A single-crystal X-ray diffraction study

AU - Seryotkin, Yurii V.

N1 - Publisher Copyright: © 2018 Elsevier Inc.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - 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.

AB - 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.

KW - Brewsterite

KW - Compressibility

KW - Crystal structure

KW - High pressure

KW - Phase transformation

KW - Single-crystal X-ray diffraction

KW - Zeolite

UR - http://www.scopus.com/inward/record.url?scp=85054297744&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2018.09.030

DO - 10.1016/j.micromeso.2018.09.030

M3 - Article

AN - SCOPUS:85054297744

VL - 276

SP - 167

EP - 172

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

ER -