The electrostatic and Born-Mayer repulsive
potentials method was used to calculate the higher order elastic constants and
pressure derivatives of alkaline-earth oxide CaO in a wide temperature range
(100 - 1000 K). The calculations have been made starting from primary physical
parameters viz. nearest-neighbour
distance and hardness parameter assuming long- and short- range potentials. The
different results of the calculations are compared with experimental data and
discussed.
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