Possible mechanism of charge transport and dielectric relaxation in SrO-Bi{sub 2}O{sub 3}-B{sub 2}O{sub 3} glasses

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3246810· OSTI ID:21361889

Majhi, Koushik; Varma, K B. R.; Rao, K J ^[1]

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1. Materials Research Centre, Indian Institute of Science, Bangalore 560012 (India)

Transparent SrBi{sub 2}B{sub 2}O{sub 7} 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.

• OSTI ID: 21361889
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 8; Other Information: DOI: 10.1063/1.3246810; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
BORON OXIDES
CALORIMETRY
CHARGE TRANSPORT
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
FREQUENCY DEPENDENCE
GLASS
HZ RANGE
IMPEDANCE
MHZ RANGE 01-100
OXYGEN
RELAXATION
SPECTROSCOPY
STRONTIUM OXIDES
SWITCHES
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BORON COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FREQUENCY RANGE
MATERIALS
MHZ RANGE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS