• S C Deorani

      Articles written in Pramana – Journal of Physics

    • Ultrasonic investigation in KTaO3

      S C Deorani U C Naithani B S Semwal

      More Details Abstract Fulltext PDF

      The anomalous ultrasonic attenuationαc of longitudinal waves propagating along (100) direction in KTaO3 has been analyzed above the phase transition temperature in the frequency range 150–300 MHz in the paraelectric phase. The attenuation of longitudinal ultrasonic waves in KTaO3 is primarily due to a strong interaction with thermally-excited phonons in the soft mode. Frequency and temperature variations of attenuation are discussed.

    • Microwave losses in ABO3 type perovskites

      S C Deorani U C Naithani B S Semwal

      More Details Abstract Fulltext PDF

      Using Green’s function method, microwave lossess were theoretically calculated for BaTiO3, SrTiO3 and KTaO3 ferroelectric perovskites. In microwave range, an increase in frequency is followed by an increase in the dielectric loss. In the paraelectric phase, the dielectric loss decreases with increasing temperature showing the Curie-Weiss behaviour of the tangent loss.

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