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1994•physica status solidi (b)Requires access

Birch Equation of State for Alkali Halide Crystals

L. M. Thomas, J. Shanker

Open publisher page 12 citations

Abstract

Abstract The Birch equation of state (BES) derived from the theory of finite strain is used to calculate the pressure versus volume compression data at room temperature for eleven alkali halide crystals, viz. LiF, LiCl, LiBr, LiI, NaF, NaCl, NaBr, NaI, CsCl, CsBr, and CsI. These crystals can be compressed to rather high pressures without appearance of any structural phase transformation. The parameters of BES are determined from the ultrasonically measured experimental values of the bulk modulus and its first pressure derivative and the calculated values of second pressure derivative of bulk modulus derived from interionic potential models. The resulting P‐V data for all the crystals compare well with the corresponding experimental values reported by Vaidya and Kennedy and by Yagi.

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Abstract The Birch equation of state (BES) derived from the theory of finite strain is used to calculate the pressure versus volume compression data at room temperature for eleven alkali halide crystals, viz. LiF, LiCl, LiBr, LiI, NaF, NaCl, NaBr, NaI, CsCl, CsBr, and CsI. These crystals can be compressed to rather high pressures without appearance of any structural phase transformation. The parameters of BES are determined from the ultrasonically measured experimental values of the bulk modulus and its first pressure derivative and the calculated values of second pressure derivative of bulk modulus derived from interionic potential models. The resulting P‐V data for all the crystals compare well with the corresponding experimental values reported by Vaidya and Kennedy and by Yagi.

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Available abstract

Abstract The Birch equation of state (BES) derived from the theory of finite strain is used to calculate the pressure versus volume compression data at room temperature for eleven alkali halide crystals, viz. LiF, LiCl, LiBr, LiI, NaF, NaCl, NaBr, NaI, CsCl, CsBr, and CsI. These crystals can be compressed to rather high pressures without appearance of any structural phase transformation. The parameters of BES are determined from the ultrasonically measured experimental values of the bulk modulus and its first pressure derivative and the calculated values of second pressure derivative of bulk modulus derived from interionic potential models. The resulting P‐V data for all the crystals compare well with the corresponding experimental values reported by Vaidya and Kennedy and by Yagi.

Key concepts: Halide, Alkali metal, Equation of state, Bulk modulus, Thermodynamics, Phase (matter), Compression (physics), Derivative (finance)

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