Lower mantle phase transitions may generally have negative pressure‐temperature slopes

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62 Scopus citations

Abstract

Phase transitions in oxides at pressures above about 150 kbar may commonly have negative pressure‐temperature slopes. The causes of the higher entropies of denser phases include low frequency vibrations of small atoms in sites having high coordination number and long metal‐oxygen distances, decrease in directional bonding, positional disorder and possible solid‐electrolyte behavior, and semiconductor‐metal and metal‐metal transitions.

Original languageEnglish (US)
Pages (from-to)709-711
Number of pages3
JournalGeophysical Research Letters
Volume7
Issue number9
DOIs
StatePublished - Sep 1980
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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