Abstract
A comparative study of the thermodynamic and magnetic properties of the Ga-substituted magnesium ferrite polycrystalline samples Mg(Fe1-xGax)2O4 with x = 0.2 and x = 0.4 was carried out. The low-temperature heat capacity of the sample with x = 0.2 was measured by adiabatic calorimetry. Based on the smoothed heat capacity data Cp,m°(T) for Mg(Fe0.8Ga0.2)2O4, the standard thermodynamic functions were determined in a temperature range 2–800K. A broad heat capacity anomaly below 60K, which can be attributable to the magnetic order-disorder transition, was observed for both samples. The field-dependence of magnetizations in an applied magnetic field up to ± 50kOe revealed the ferrimagnetic behaviour of the samples. The values of Curie temperature (TC) and the blocking temperature (TB) were determined from ZFC-FC magnetization measurements. Based on the results of heat capacity and magnetic measurements, the low temperature state in the Mg(Fe0.6Ga0.4)2O4 sample may be attributed to a spin glass-like state.
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