Diffraction Studies of a Highly Metastable Form of Amorphous Silica

JOHN KONNERT, PETER D'ANTONIO, MARIA HUFFMAN, ALEXANDRA NAVROTSKY

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

An amorphous powder of SiO2 that calorimetric studies indicated to be energetically metastable by 46.9 ± 0.8 kj/mol relative to fused silica was studied by X‐ray diffraction. A calculation of the energetic instability, based on the bond length and bond angle distributions derived from the diffraction data and utilizing the force constants for bond stretching and bending, indicated that 41.3 ± 7.9 kj/mol of the instability may be associated with distortions of the Si‐O bonds, the O‐Si‐O bond angles, and the Si‐O‐Si angles. Analyses of the extensive small‐angle scattering from the porous material suggested that only a small portion of the instability is associated with surface structures.

Original languageEnglish (US)
Pages (from-to)192-196
Number of pages5
JournalJournal of the American Ceramic Society
Volume70
Issue number3
DOIs
StatePublished - Mar 1987
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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