S. Bhagat

Tilka Manjhi Bhagalpur University, Bhāgalpur, Bihār, India

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Publications (6)6.49 Total impact

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    ABSTRACT: Lead-free perovskite BaY0.5Nb0.5O3 was prepared by conventional ceramic technique at 1375 °C/7 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were derived from the experimental results using FullProf software. XRD analysis of the compound indicated the formation of a single-phase cubic structure with the space group Pm3̄m. EDAX, X-ray mapping and SEM studies were carried to study the quality and purity of the compound. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using the impedance data. Electric modulus studies supported the hopping type of conduction in BaY0.5Nb0.5O3. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in BaY0.5Nb0.5O3. The ac conductivity data were used to evaluate the density of states at Fermi level, minimum hopping length and apparent activation energy of the compound.
    Physica B Condensed Matter 01/2010; 405(17):3564-3571. · 1.28 Impact Factor
  • Advances in Applied Ceramics - ADV APPL CERAM. 01/2010; 109(4):225-233.
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    ABSTRACT: A new lead free perovskite ceramic Ba(Bi0.5Nb0.5)O3 was prepared by conventional ceramic technique at 1185ºC and subsequent sintering at 1200ºC in air atmosphere. XRD analysis of Ba(Bi0.5Nb0.5)O3-powder indicated the formation of a single-phase monoclinic structure. The ac conductivity data were found to obey the power law and showed negative temperature coefficient of resistance behaviour. The ac conductivity data were used to evaluate the density of states at the Fermi level, minimum hopping length and activation energy of the compound. The correlated barrier hopping model was found to successfully explain the mechanism of charge transport in Ba(Bi0.5Nb0.5)O3.
    MATERIALS SCIENCE-POLAND 01/2010; 28(1):317-325. · 0.37 Impact Factor
  • S. Bhagat, K. Prasad
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    ABSTRACT: Lead-free perovskite Ba(Fe1/2Nb1/2)O3 (BFN) was prepared by conventional ceramic fabrication technique at 1200 °C/5 h in air atmosphere. The crystal symmetry, space group, and unit cell dimensions were determined from the experimental results using FullProf software whereas crystallite size and lattice strain were estimated from Williamson–Hall approach. X-ray diffraction (XRD) analysis of the compound indicated the formation of a single-phase monoclinic structure with the space group P2/m. EDAX and SEM studies were carried out in order to evaluate the quality and purity of the compound. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using the impedance data. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. The correlated barrier hopping (CBH) model was employed to successfully explain the mechanism of charge transport in BFN.
    Physica Status Solidi (A) Applications and Materials 12/2009; 207(5):1232 - 1239. · 1.53 Impact Factor
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    ABSTRACT: A new lead-free perovskite ceramic Ba(Bi1/2Nb1/2)O3 was prepared by a conventional ceramic technique at 1185 °C in oxygen atmosphere. X-ray diffraction analysis of the compound indicated the formation of a single-phase monoclinic structure. Dielectric study revealed a diffuse phase transition at 340 °C. Cole–Cole analyses suggested the dielectric relaxation to be of non-Debye type. Electric modulus studies supported the hopping type of conduction in Ba(Bi1/2Nb1/2)O3. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
    Physica Status Solidi (A) Applications and Materials 12/2008; 206(2):316 - 320. · 1.53 Impact Factor
  • K. Prasad, S. Bhagat, K. AmarNath
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    ABSTRACT: Sugar content in commercially available beverages has been estimated using ultrasonic velocity measurement technique. The ultrasonic velocity, density and refractive index was measured in the mixture of 50:50 wt:wt solution of glucose and sucrose with distilled water over various concentrations (0 – 40 %) at 26C. Different techniques for sugar content determination have been compared with ultrasonic velocity measurement technique.
    Indian Journal of Physics 01/2000; 74A(4):387-389. · 1.79 Impact Factor