Dynamic cluster model of the ac conductivity of crystalline materials and glasses
- School of Mines, Division of Materials Science, Columbia University, New York, New York 10027 (United States)
Many ionically conducting crystalline materials, glasses, and polymers exhibit a power-law frequency dependence of the ac conductivity with exponent s{approx}0.6 in the temperature range 300{endash}500 K. To explain this phenomenon a dynamic cluster model (DCM) is suggested. DCM describes the dispersive frequency behavior and defines the range of frequency and dopant concentration at which a power-law behavior takes place. It also establishes an important role of the effective charge of carriers Ze/{radical} ({var_epsilon}{sub S}) . Experimental results for Na{sub 2}O{center_dot}3SiO{sub 2} glass and for CeO{sub 2} and CaTiO{sub 3} ceramics doped with aliovalent ions are in good agreement with this theory. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 659324
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 58; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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