Ionicity and phase transitions at negative pressures

A. Navrotsky; J. C. Phillips

doi:10.1103/PhysRevB.11.1583

Ionicity and phase transitions at negative pressures

A. Navrotsky, J. C. Phillips

CLAS-NS: Molecular Sciences, School of (SMS)

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

The Gibbs-free-energy difference ΔGt which determines the phase transition from fourfold to sixfold coordination in ANB8-N compounds is presented for three compounds (CdO, MgO, and AgBr) which are stable at STP in the more-dense (NaCl) structure. The additional data follow a linear trend in spectroscopic ionicity predicted previously from high-pressure data on compounds stable in fourfold coordinated structures. These data resolve ambiguities concerning the proper definition of ionic character in partially covalent compounds with the NaCl structure.

Original language	English (US)
Pages (from-to)	1583-1586
Number of pages	4
Journal	Physical Review B
Volume	11
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.11.1583
State	Published - 1975

ASJC Scopus subject areas

Condensed Matter Physics

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abstract = "The Gibbs-free-energy difference ΔGt which determines the phase transition from fourfold to sixfold coordination in ANB8-N compounds is presented for three compounds (CdO, MgO, and AgBr) which are stable at STP in the more-dense (NaCl) structure. The additional data follow a linear trend in spectroscopic ionicity predicted previously from high-pressure data on compounds stable in fourfold coordinated structures. These data resolve ambiguities concerning the proper definition of ionic character in partially covalent compounds with the NaCl structure.",

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AB - The Gibbs-free-energy difference ΔGt which determines the phase transition from fourfold to sixfold coordination in ANB8-N compounds is presented for three compounds (CdO, MgO, and AgBr) which are stable at STP in the more-dense (NaCl) structure. The additional data follow a linear trend in spectroscopic ionicity predicted previously from high-pressure data on compounds stable in fourfold coordinated structures. These data resolve ambiguities concerning the proper definition of ionic character in partially covalent compounds with the NaCl structure.

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