Transformation of aluminosilicate wet gel to solid state

Katalin Sinkó, László Pöppl

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Optically clear, homogeneous, monolithic aluminosilicate gels were prepared directly from solutions of inorganic aluminum salt, tetraethoxysilane, and alcohol. The dried aluminosilicate gels show new special properties, e.g. piezoelectricity and variable porosity (1-2000m2/g) due to the fractal-like gel structure. Ceramic products, which keep the chemical bonds and structure of the gels, were produced by heat treatment at 300-350°C. The processes that occurred during heat treatment were investigated by thermal analysis and mass spectrometry. The temperature limits of the gel state were determined by differential scanning calorimetry and small angle X-ray scattering. The collapse of the gel structure began around 350°C; however, the amorphous character remained until the temperature (ca. 970°C) of the phase transmission.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalJournal of Solid State Chemistry
Volume165
Issue number1
DOIs
Publication statusPublished - Jan 1 2002

Keywords

  • Aluminosilicate
  • Gel
  • Heat treatment
  • MS
  • SAXS
  • Thermal analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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