Polar fluctuations in Mn substituted KTaO{sub 3} ceramics
Journal Article
·
· Journal of Applied Physics
- Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ (United Kingdom)
- London South Bank University, Borough Road, SE1 0AA London (United Kingdom)
- University of Nova Gorica, Materials Research Laboratory, 5000 Nova Gorica (Slovenia)
Polar fluctuations were found in KTaO{sub 3} when K{sup +} was substituted with Mn{sup 2+} on the A-site. The temperature dependence of the real part of the dielectric permittivity of (K{sub 1-2x}Mn{sub x{open_square}x})TaO{sub 3} ceramics (x=0-0.05) shows a diffuse maximum between 50-100 K in the frequency range 10{sup 2}-10{sup 6} Hz, shifting to higher temperature with increasing frequency and Mn content. The results are analyzed using a modified Curie-Weiss law, the Cole-Cole equation and the Arrhenius law. Here it is suggested that the observed relaxor-type dielectric behavior is attributed to the formation of electric dipoles originating from two distinct sources; one from an atomic off-center position when Mn{sup 2+} substitutes for K{sup +} and one from the anion deficiencies formed by these aliovalent substitutions.
- OSTI ID:
- 21476468
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 108; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dielectric and AC conductivity studies of Nd substituted 0.8BaTiO{sub 3}-0.2(Bi{sub 0.5(1-x)}Nd{sub 0.5x}K{sub 0.5})TiO{sub 3} lead free ceramics
Phase structure, dielectric properties, and relaxor behavior of (K{sub 0.5}Na{sub 0.5})NbO{sub 3}-(Ba{sub 0.5}Sr{sub 0.5})TiO{sub 3} lead-free solid solution for high temperature applications
Effect of dead layer and strain on diffuse phase transition of PLZT relaxor thin films.
Journal Article
·
Mon May 23 00:00:00 EDT 2016
· AIP Conference Proceedings
·
OSTI ID:22608804
Phase structure, dielectric properties, and relaxor behavior of (K{sub 0.5}Na{sub 0.5})NbO{sub 3}-(Ba{sub 0.5}Sr{sub 0.5})TiO{sub 3} lead-free solid solution for high temperature applications
Journal Article
·
Mon Jun 15 00:00:00 EDT 2009
· Journal of Applied Physics
·
OSTI ID:21352261
Effect of dead layer and strain on diffuse phase transition of PLZT relaxor thin films.
Journal Article
·
Mon Jan 31 23:00:00 EST 2011
· Acta Materialia
·
OSTI ID:1008283
Related Subjects
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ANIONS
CERAMICS
CHARGED PARTICLES
CURIE-WEISS LAW
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIPOLES
ELECTRIC DIPOLES
ELECTRICAL PROPERTIES
FLUCTUATIONS
FREQUENCY DEPENDENCE
IONS
MANGANESE COMPOUNDS
MANGANESE IONS
MATERIALS
MULTIPOLES
OXYGEN COMPOUNDS
PERMITTIVITY
PHYSICAL PROPERTIES
POLARIZATION
POTASSIUM COMPOUNDS
POTASSIUM IONS
REFRACTORY METAL COMPOUNDS
TANTALATES
TANTALUM COMPOUNDS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ANIONS
CERAMICS
CHARGED PARTICLES
CURIE-WEISS LAW
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIPOLES
ELECTRIC DIPOLES
ELECTRICAL PROPERTIES
FLUCTUATIONS
FREQUENCY DEPENDENCE
IONS
MANGANESE COMPOUNDS
MANGANESE IONS
MATERIALS
MULTIPOLES
OXYGEN COMPOUNDS
PERMITTIVITY
PHYSICAL PROPERTIES
POLARIZATION
POTASSIUM COMPOUNDS
POTASSIUM IONS
REFRACTORY METAL COMPOUNDS
TANTALATES
TANTALUM COMPOUNDS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VARIATIONS