Preparation and properties of primary leonhardite, (Na, K)-exchanged forms of laumontite

Atsushi Yamazaki, Takahiro Shiraki, Hironori Ishida, Ryohei Otsuka

Research output: Contribution to journalArticlepeer-review


(Na, K)-exchanged forms of laumontite, co-called “primary leonhardite”, can be prepared under hydrothermal conditions. The products show two steps of dehydration at about 180 and 240°C on TG-DTA curves, the same as previous reports about primary leonhardite. XRD data recorded under controlled relative-humidity suggest that the synthetic “primary leonhardite” maintains a similar framework structure to the fully hydrated phase of laumontite between 0 and 100% RH at 25°C. The number of water molecules varied from 13 to 17 per unit cell when replacing Ca by alkaline cations. The alkaline extra-framework cation sites of “primary leonhardite” are determined by Rietveld's method.

Original languageEnglish
Pages (from-to)32-33
Number of pages2
JournalStudies in Surface Science and Catalysis
Issue numberC
Publication statusPublished - 1995 Jan 1

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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