The phenomenological forms for isothermal equations of state (EOS) of
solids have played a very important role in the field of high-pressure physics.
An isothermal EOS is used to study the relationship between pressure P and
volume compression at a given temperature. It is also used to study the
isothermal bulk modulus BT and its pressure derivatives B`T and B``T,
respectively. In the present study we have taken five different forms of EOS
which contain B 0 and B`0 only. Using these forms we have studied the
pressure-volume relationships for MgO at room temperature and at different
range of temperatures. The results for pressure P, isothermal bulk modulus BT
and pressure derivative B`T obtained from different equations are compared. The
comparison reveals that the all EOS yield very similar results. - See more at: .
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