Structuration under pressure

Spatial separation of inserted water during pressure-induced hydration in mesolite

Yonghwi Kim, Jinhyuk Choi, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In situ high-pressure single-crystal X-ray diffraction studies of mesolite, an aluminosilicate composed of stacks of Na+ -containing natrolite and Ca2+-containing scolecite layers in the ratio of 1:2, showed two discrete steps of pressure-induced hydration (PIH): first H2O molecules are inserted into the natrolite layers between ∼0.5 and ∼1.5 GPa and subsequently into the scolecite layers. During the PIH in the natrolite layers, the coordination environment of Na+ changes from six to seven, the same as that of Ca2+ in the scolecite layers. While the natrolite layers behave as in the mineral natrolite, the scolecite layers show a different behavior from the mineral scolecite by adopting the super-hydrated natrolite-type structure at higher pressure, as a larger distortion is not favorable in the 1:2 layered framework. This spatial separation of inserted H2O during PIH and the growing structural similarity of the two layers result in a weakening of k 3n reflections maintaining the 1:2 layer configuration. Our study of this unique behavior of mesolite provides a simple model of structuration under pressure, and the implications of our experimental findings are discussed.

Original languageEnglish
Pages (from-to)175-178
Number of pages4
JournalAmerican Mineralogist
Volume103
Issue number1
DOIs
Publication statusPublished - 2018 Jan 26

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water pressure
hydration
Hydration
natrolite
Water
water
Minerals
minerals
MesoLite
aluminosilicate
Single crystals
mineral
X ray diffraction
Molecules
X-ray diffraction
crystal
single crystals

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "In situ high-pressure single-crystal X-ray diffraction studies of mesolite, an aluminosilicate composed of stacks of Na+ -containing natrolite and Ca2+-containing scolecite layers in the ratio of 1:2, showed two discrete steps of pressure-induced hydration (PIH): first H2O molecules are inserted into the natrolite layers between ∼0.5 and ∼1.5 GPa and subsequently into the scolecite layers. During the PIH in the natrolite layers, the coordination environment of Na+ changes from six to seven, the same as that of Ca2+ in the scolecite layers. While the natrolite layers behave as in the mineral natrolite, the scolecite layers show a different behavior from the mineral scolecite by adopting the super-hydrated natrolite-type structure at higher pressure, as a larger distortion is not favorable in the 1:2 layered framework. This spatial separation of inserted H2O during PIH and the growing structural similarity of the two layers result in a weakening of k 3n reflections maintaining the 1:2 layer configuration. Our study of this unique behavior of mesolite provides a simple model of structuration under pressure, and the implications of our experimental findings are discussed.",
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Structuration under pressure : Spatial separation of inserted water during pressure-induced hydration in mesolite. / Kim, Yonghwi; Choi, Jinhyuk; Vogt, Thomas; Lee, Yongjae.

In: American Mineralogist, Vol. 103, No. 1, 26.01.2018, p. 175-178.

Research output: Contribution to journalArticle

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