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On the third‐order elastic constants of ionic solids with NaCl structure
Author(s) -
Garg V. K.,
Puri D. S.,
Verma M. P.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220800107
Subject(s) - halide , alkali metal , ionic bonding , thermodynamics , range (aeronautics) , third order , constant (computer programming) , chemistry , ionic crystal , alkaline earth metal , order (exchange) , materials science , physics , inorganic chemistry , ion , organic chemistry , composite material , philosophy , theology , finance , computer science , economics , programming language
Expressions for the third order elastic (TOE) constants of ionic solids, crystallizing in the NaCl structure, derived earlier from the Lundqvist potential by Puri and Verma are modified to take account of the second neighbour short range repulsive interactions. These expressions are used to evaluate the TOE constants and the pressure derivatives of the second order elastic (SOE) constants of alkaline earth oxides and those alkali halides which crystallize in the NaCl structure. The calculated values give fairly good agreement with available experimental results and in this respect are better than the results reported by other theoretical workers and those obtained in earlier calculations where short range repulsion was limited to nearest neighbours only.