Pressure-Induced Hydration and Formation of Bilayer Ice in Nacrite, a Kaolin-Group Clay

Huijeong Hwang, Jinhyuk Choi, Zhenxian Liu, Duck Young Kim, Yu He, Aaron J. Celestian, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

Abstract

Pressure-induced hydration of the clay mineral nacrite, Al2Si2O5(OH)4 is, in contrast to its polymorph kaolinite, partially irreversible. At ambient conditions after pressure release, a majority phase with composition Al2Si2O5(OH)42H2O with an intense (002) diffraction peak near d ∼8.4 Å has been found. Both in situ X-ray diffraction and simulations based on the density functional theory point to intercalation of molecules in nominally nonswelling clays and specific geophysical and geochemical conditions.

Original languageEnglish
Pages (from-to)183-188
Number of pages6
JournalACS Earth and Space Chemistry
Volume4
Issue number2
DOIs
Publication statusPublished - 2020 Feb 20

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Atmospheric Science
  • Space and Planetary Science

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