Elastic properties and phase stability of AgBr under pressure
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Ab initio calculations have been used to derive the elastic constants, equation of state and free energy of NaCl-, KOH-, and CsCl-type structures of AgBr. The elastic constants have been derived by the stress-strain relation. The shear elastic constants $C_{44}$ has proven to be exceptionally soft. We have found that at temperature T=0 the phase transition from the low pressure NaCl-type to the high-pressure CsCl-type structure goes over a monoclinic KOH-type structure. The free energy comparison indicates that the monoclinic phase ranges from 8 to 35 GPa.
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