Dielectric relaxation and polaronic hopping in Al-substituted Sm1.5Sr0.5NiO4 ceramics

The structure and dielectric properties of Sm1.5Sr0.5Ni1-xAlxO4 (x = 0.,0.5) ceramics were presented. A single orthorhombic phase was obtained in Sm1.5Sr0.5Ni0.7Al0.3O4 ceramics, while minor impurities existed in Sm1.5Sr0.5Ni0.5Al0.5O4 ceramics. Temperature stable giant dielectric response was obser...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2010-12, Vol.43 (49), p.495402-495402
Main Authors: Liu, Xiao Qiang, Jia, Bo Wen, Yang, Wen Zhi, Cheng, Ji Peng, Chen, Xiang Ming
Format: Article
Language:English
Subjects:
Adiabatic flow
Aluminium
Aluminum
Ceramics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Correlation
Dielectric loss and relaxation
Dielectric properties of solids and liquids
Dielectric relaxation
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electrical conduction
Electronic transport in condensed matter
Exact sciences and technology
Mobility edges
hopping transport
Orthorhombic phase
Permittivity (dielectric function)
Physics
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Summary:The structure and dielectric properties of Sm1.5Sr0.5Ni1-xAlxO4 (x = 0.,0.5) ceramics were presented. A single orthorhombic phase was obtained in Sm1.5Sr0.5Ni0.7Al0.3O4 ceramics, while minor impurities existed in Sm1.5Sr0.5Ni0.5Al0.5O4 ceramics. Temperature stable giant dielectric response was observed in these two ceramics, and only one dielectric relaxation was found. After comparing the activation energies of dielectric relaxation and electrical conduction, the giant dielectric response should be attributed to the adiabatic small polaronic hopping process, and the dielectric behaviour of the samples with different aluminium contents confirmed the correlation between the dielectric response and electrical conduction.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/43/49/495402