Abstract
A model has been developed to interpret the anomalous behavior in the elastic properties of hot-pressed MgO samples as observed by ultrasonic measurements. The present model, by including distortion of individual crystallites within the polycrystalline samples, extends the Kröner theory which calculates longitudinal and shear moduli and their pressure derivatives. In this ``distorted'' Kröner theory, a distortion factor proportional to Young's modulus is used. The results obtained from the present theory agree quite well with the observed change in the shear and longitudinal moduli in polycrystalline MgO samples which have been simultaneously subjected to pressure and temperature changes subsequent to hot pressing.
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