Electrical properties of Cr2O3-Fe2O3-P2O5 glasses. Part II

The electrical properties of xCr2O3-(40a degree x)Fe2O3a&#1 47; 60P2O5, 0a[control][curren]xa[control][curren]10, (mol%) glasses have been investigated by impedance spectroscopy. In the glasses containing up to ~5mol% Cr2O3, electrical conductivity increases due to the increase in the Fe2+/Fetot...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2010-11, Vol.356 (50-51), p.2699-2703
Main Authors: SANTIC, A, KIM, C. W, DAY, D. E, MOGUS-MILANKOVIC, A
Format: Article
Language:English
Subjects:
Chromium oxides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivity of specific materials
Cross-disciplinary physics: materials science
rheology
Crystallites
Disordered solids
Electrical conductivity
Electrical properties
Electrical resistivity
Electronic transport in condensed matter
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Glass
Glasses (including metallic glasses)
Iron
Materials science
Physics
Polarons
Resistivity
Solid-solid transitions
Specific materials
Specific phase transitions
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Summary:The electrical properties of xCr2O3-(40a degree x)Fe2O3a&#1 47; 60P2O5, 0a[control][curren]xa[control][curren]10, (mol%) glasses have been investigated by impedance spectroscopy. In the glasses containing up to ~5mol% Cr2O3, electrical conductivity increases due to the increase in the Fe2+/Fetot ratio. The conduction in these glasses is independent on Cr2O3 and it is controlled by the polaron hopping between iron ions. The electrical conductivity of the partially crystallized sample with 10mol% Cr2O3 slightly increases although the Fe2O3 content and the fraction of Fe2+ ions are smaller. This effect is related to the formation of highly disruptive regions around the beta -CrPO4 and Fe3(P2O7)2 crystallites in the glass matrix of this sample. These interconnected disruptive regions form the easy conductive pathways leading to a higher conductivity. Changes in the dielectric permittivity in chromium iron phosphate glasses are dependent on the Fe2+/Fetot ratio and, therefore, associated with the concentration of polarons related to Fe2+ and Fe3+ sites.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2010.09.072