• S V Bhat

      Articles written in Bulletin of Materials Science

    • An electron spin resonance study of Mn2+ doped calcium hydrazine carboxylate monohydrate

      M M Abdel Gawad G V Mahesh K C Patil S V Bhat

      More Details Abstract Fulltext PDF

      Single crystals of calcium hydrazine carboxylate, monohydrate have been studied by ESR of Mn2+ doped in the calcium sites. X-band ESR indicated a large crystal field splitting necessitating experiments at Q band. The analysis shows two magnetically inequivalent (but chemically equivalent) sites withgxx = 2.0042±0.0038,gyy=2.0076 ±0.0029,gzz=2.0314±0.001,Azz=0.0099±0.0002 cm−1,Axx=0.0092±0.0002 cm−1,Ayy=0.0082±0.0002 cm−1,D=3/2Dzz=0.0558±0.0006 cm−1, andE=1/2 (DyyDyy)=0.0127±0.0002 cm−1.

      One of the principal components of the crystal field, (Dzz), is found to be along the Ca ↔ Ca direction in the structure and a second one, (Dxx), along the perpendicular to the plane of the triangle formed by three neighbouring calciums. TheA tensor is found to have an orientation different from that of theg andD tensors reflecting the low symmetry of the Ca2+ sites.

    • Non-resonant RF and microwave response: A novel technique for the characterization of superconducting materials

      S V Bhat

      More Details Abstract Fulltext PDF

      When examined using continuous wave electron paramagnetic resonance and nuclear magnetic resonance spectrometers, the highTc superconductors give rise to intense, low field, ‘non-resonant’ absorption signals in the superconducting state. This phenomenon can be used as a highly sensitive, contactless technique for the detection and characterization of superconductivity even in samples containing only minute amounts of the superconducting phase. Further, it can also be applied to the determination of material parameters of interest such asJc andHc2 in addition to being a powerful way of distinguishing between weak-link superconductivity and bulk superconductivity. The details of these aspects are discussed.

    • (PEG)xNH4ClO4: a new polymeric fast proton conductor

      Nader Binesh S V Bhat

      More Details Abstract Fulltext PDF

      A new polymer electrolyte (PEG)x NH4ClO4(x = 5, 10, 15, 20) has been prepared that shows protonic conduction. The room temperature conductivities are of the order of 10−7S/cm, and increase with decrease in salt concentration. NMR line width studies indicate fairly low glass transition temperatures of the polymer salt complexes.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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