First-principles calculations of the crystal structures, andphase transition, and elastic properties of cadmium oxide dO) have been carried out with the plane-wave pseudopo-tential within the generalized gradient approximation in theframe of density functional theory method.The calculatedvalues (for crystal structures) are in good agreement with ex-perimental data as Well as with some of the existing model calculations. For CsCl-type CdO, the dependence of the elas-tic constants c_(ij),the aggregate elastic modulus(B, G, E),andthe elastic anisotropy on the pressure have been investigated.Moreover, the pressure dependences of the Poisson ratio,Debye temperature, and the compressional and shear elasticwave velocities have been investigated for the first time.
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