The Effect of Oxygen Vacancies in Ca_1−xSr_xHfO₃

Abstract

Samples of Ca1−xSrxHfO3 with x = 0.25, 0.50 and 0.75 have been studied. These oxides were synthesized using the high temperature solid state reaction method that can produce oxygen vacancies. The lattice and the hyperfine interaction parameters were determined. From these data it is possible correlate the behaviour of the hyperfine parameters with composition and temperature. The effect of oxygen vacancies is analyzed. The temperature dependence of hyperfine parameters display discontinuities that are interpreted as signs of crystalline phase transitions at about 900, 850 and 700 K, for x = 0.25, 0.50 and 0.75, respectively.