X‐ray Diffraction and Chemical Characterization of the Plastic Colloid Fraction of Chinastone

Richard Lehman, Victor A. Greenhut, Lingxiang Gao

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Abstract

The fine particle size fraction from a South China china‐stone material used in porcelains and renowned for its plasticity was characterized to determine the chemical and crystallographic structure of the <2 μm fraction. Chemical analysis suggested the presence of a chloritic material in the fine fraction, a premise which was supported by X‐ray diffraction and thermal analysis. The chinastone has a well‐defined 1.4‐nm basal spacing which did not expand when subjected to ethylene glycol. However, the (001) reflections produced an anomalous broadening and decrease in spacing to 1.28 nm when heated to 700°C. The X‐ray patterns and chemical composition are similar to those at an aluminum‐treated montmorillonite which contains condensed gibbsite interlayered between montmorillonite units. Chemical analysis of individual particles plus X‐ray and thermal analysis leads to the conclusion that the fine fraction of the chinastone is an alumina‐rich chlorite with unusually low iron and magnesium levels.

Original languageEnglish (US)
Pages (from-to)9-14
Number of pages6
JournalJournal of the American Ceramic Society
Volume78
Issue number1
DOIs
Publication statusPublished - Jan 1 1995

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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