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Mechanical stress induced voltage shift in polycrystalline Bi3.25La0.75Ti3O12 thin films
Imprint behavior of polycrystalline Bi3.25La0.75Ti3O12 thin films under stress was studied. The voltage shift along the positive voltage axis can be depressed by tensile stress while increased by comp...
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Investigation of high Curie temperature (1−x)BiSc1−yFeyO3–xPbTiO3 piezoelectric ceramics
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Possible mechanism of charge transport and dielectric relaxation in SrO–Bi2O3–B2O3 glasses

J. Appl. Phys. 106, 084106 (2009); doi:10.1063/1.3246810

Published 28 October 2009

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Koushik Majhi, K. B. R. Varma, and K. J. Rao
Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
Transparent SrBi2B2O7 glasses were prepared via melt-quenching technique and characterized using differential scanning calorimetry and x-ray powder diffraction. The ac conductivities of the glasses were studied as a function of frequency (100 Hz–10 MHz) at different temperatures. The frequency dependence of conductivity has been analyzed using Almond–West expression. The exponent n was nearly unaffected by temperature. Impedance and modulus spectroscopies were employed to further examine the electrical data. Dielectric relaxation exhibited a stretched exponential behavior with a stretching exponent beta independent of temperature. From conductivity analysis we have proposed that the charge transport occurs through the participation of nonbridging oxygen (NBO), which switches positions in a facile manner. The stretched exponential behavior appears to be a direct consequence of the NBO switching mechanism of charge transport. ©2009 American Institute of Physics
History: Received 15 July 2009; accepted 16 September 2009; published 28 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/084106/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.70.Ce
    Optical glasses, quartz
  • 72.20.Fr
    Low-field transport and mobility; piezoresistance (semiconductors/insulators)
  • 72.80.Sk
    Electrical conductivity of insulators
  • 81.20.-n
    Methods of materials synthesis and materials processing
  • 81.05.Kf
    Glasses: fabrication, treatment, testing and analysis
  • 77.22.Gm
    Dielectric loss and relaxation
  • YEAR: 2009

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ISSN:
0021-8979 (print)   1089-7550 (online)
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