HIGH PRESSURE DECOMPOSITION OF gamma -Fe2SiO4.

Hiroshi Sawamoto, Eiji Otani, Mineo Kumazawa

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

The high pressure and high temperature runs are made on gamma -Fe//2SiO//4 by means of MASS-318, and the interpretation of the run products reveals the phase change sequence - spinel yields rocksalt plus perovskite-like yields rocksalt plus rutile, at relatively low temperatures. The perovskite-like phase is a new hexagonal form of FeSiO//3 presumably isostructural with the high-temperature form of BaTiO//3 with a (abcacb) type stacking mode along a hexagonal c-axis. At high temperatures above 2000 degree C however, gamma -Fe//2SiO//4 may decompose directly to the isochemical oxide mixture. A geophysical implication of the present results is discussed in connection with the constitution of the earth's interior. The correlation of the seismological transition layers in the upper mantle to the phase changes in (Mg,Fe)//2SiO//4 is not so simple as having been interpreted.

Original languageEnglish
Pages194-201
Number of pages8
Publication statusPublished - 1975 Jan 1
EventInt Conf on High Pressure, 4th, Proc - Kyoto, Jpn
Duration: 1974 Nov 251974 Nov 29

Other

OtherInt Conf on High Pressure, 4th, Proc
CityKyoto, Jpn
Period74/11/2574/11/29

ASJC Scopus subject areas

  • Engineering(all)

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    Sawamoto, H., Otani, E., & Kumazawa, M. (1975). HIGH PRESSURE DECOMPOSITION OF gamma -Fe2SiO4.. 194-201. Paper presented at Int Conf on High Pressure, 4th, Proc, Kyoto, Jpn, .