High pressure synthesis of a new aluminium silicate: Al5Si5O17(OH).

• Eggleton R. A.

  Geology Department, Australian National University

• Boland J. N.

  Research School of Earth Sciences, Australian National University

• Ringwood A. E.

  Research School of Earth Sciences, Australian National University

Bibliographic Information

Other Title

• High pressure synthesis of a new aluminum silicate: Al5Si5O17(OH)

Abstract

A new aluminium silicate has been produced under hydrous conditions from Al₂O₃-SiO₂ oxide mixes with Si/Al ratios close to unity, at pressures greater than 100 kilobars and at about 1, 000°C. X-ray powder photographs indicated one dominant new phase. From analyses of the electron diffraction Laue zones of minute fragments (∼1μm), a monoclinic structure that fitted the X-ray powder results was identified. This monoclinic structure is described in terms of nine close-packed layers of oxygen with the unit cell containing 72 oxygen atoms. Assuming Si/Al equals 1, the composition of this phase is Al₂₀Si₂₀O₇₂H₄. The calculated density of 4.03 g/cc is in good agreement with the value of 4.02 g/cc estimated from the refractive index measurements.

Journal

• GEOCHEMICAL JOURNAL

  GEOCHEMICAL JOURNAL 12 (3), 191-194, 1978

  GEOCHEMICAL SOCIETY OF JAPAN

Keywords

• Geochemistry and Petrology
• Geophysics

Details

• CRID: 1390282679526566400
• NII Article ID: 130003743053
• DOI: 10.2343/geochemj.12.191
• ISSN: 18805973
• ISSN: 00167002
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed