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V L Mathe
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Volume 23 Issue 5 October 2000 pp 447-452
Dielectric behaviour and a.c. conductivity in Cu
x Fe3−x O4 ferriteA N Patil M G Patil K K Patankar V L Mathe R P Mahajan S A Patil
The dielectric properties (dielectric constant and loss) for the system Cu
x Fe3−x O4 with x = 1.0, 0.8, 0.6, 0.4 and 0.2, were studied in the temperature range 300 ∼ 800 K and also in the frequency range 1 kHz ∼ 1 MHz. A.c. conductivity was derived from dielectric constant and loss tangent data. The conduction in this system is interpreted as due to small polaron hopping. The dielectric relaxation was observed for the compositions with tetragonal structure whereas normal behaviour was observed for cubic structure. -
Volume 25 Issue 4 August 2002 pp 347-350 Ferroelectrics
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
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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Bulletin of Materials Science
Volume 43, 2020
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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