The thermal behavior of k-exchanged forms of natrolite

A. Yamazaki, R. Otsuka, H. Nishido

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A series of K-exchanged forms of natrolite are easily obtained by treatment with KCl solution at room temperature for 1-62 days. The maximum degree of exchange of K is 91.94%. The thermal behavior of the exchanged forms is studied by DTA-TG and high temperature X-ray powder diffraction. The DTA curve of the exchanged form of the 91.94% sample exhibits a single large endotherm at 150°C due to a one-step dehydration, showing the remarkable decrease in dehydration temperature compared with natrolite. The dehydrated phase of natrolite collapses at about 800°C, while destruction of the dehydrated K-form occurs above 1000°C. It is well recognized that the thermal stability of natrolite is increased by Na-K exchange.

Original languageEnglish
Pages (from-to)237-242
Number of pages6
JournalThermochimica Acta
Volume109
Issue number1
DOIs
Publication statusPublished - 1986 Dec 15

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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