• S D Lotke

      Articles written in Bulletin of Materials Science

    • DC resistivity and thermoelectric power in Ni-Cd ferrites

      M G Patil V C Mahajan B V Bhise A K Ghatage S D Lotke S A Patil

      More Details Abstract Fulltext PDF

      The electrical resistivity and Seebeck coefficient for Ni-Cd ferrites have been studied as a function of temperature. The lattice constant of the phases have been evaluated from X-ray powder data. The thermoelectric power measurements indicate that the samples aren-type semiconductors and the conduction mechanism is interpreted on the basis of localized model of polarons.

    • Structural, dielectric and transport properties of Pb(Mn0.5W0.5)O3

      V L Mathe K K Patankar S D Lotke P B Joshi S A Patil

      More Details Abstract Fulltext PDF

      Polycrystalline Pb(Mn0.5W0.5)O3, a ferroelectric oxide having perovskite structure, was prepared by high temperature solid state reaction technique. Preliminary X-ray diffraction analysis confirms single phase formation with the lattice parameters 𝑎 = 7.2501 Å, 𝑏 = 8.1276 Å and 𝑐 = 12.0232 Å. Room temperature dielectric constant (𝜀' ) and loss tangent (tan 𝛿) were scanned with respect to frequency in the range 100 Hz–1 MHz. Detailed study of dielectric constant and electrical conductivity reveals a phase change around 400 K, which is quite different from those in the other materials of the same type. Further, the seebeck coefficient (𝛼) is temperature independent. The conduction is interpreted as due to small polaron hopping.

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