Abstract
Ultrasonic velocity, Young’s modulus, and internal friction have been studied in aluminum-doped zinc manganese ferrites as a function of aluminum concentration and temperature (300–600 K). The presence of aluminum impurities is found to significantly alter the ultrasonic properties and also the internal friction. In order to ascertain if a similar dependence is reflected in the dielectric behavior as well, the dielectric constant and loss tangent have also been studied in the same ferrites as a function of dopant concentration, temperature, and frequency of measurement. Relaxational behavior is noticed with a remarkable dependence on aluminum impurity concentrations. Results of ultrasonic and dielectric measurements have been explained in the light of cationic exchanges between octahedral and tetrahedral sublattices of the ferrite.
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