Impedance spectroscopy and conduction mechanism of LiAlP{sub 2}O{sub 7} material
- Condensed Matter Laboratory, University of Sfax, Faculty of Sciences, B.P. 1171, 3000 Sfax (Tunisia)
- Laboratoire de Physique des Matériaux et des Nanomatériaux Appliquée à l’Environnement, Faculté des Sciences de Gabès (Tunisia)
Highlights: • X-ray diffraction analysis reveals the structure for LiAlP{sub 2}O{sub 7} compound. • Modulus study confirmed the grain relaxation. • The equivalent circuit consists of parallel combination of (R{sub g}//CPE{sub g}) series for region I and (R{sub g}//CPE{sub g}) series with CPE{sub e} for region II. • The conductivity is due to CBH model for region I and NSPT model for region II. - Abstract: LiAlP{sub 2}O{sub 7} compound has been obtained by standard solid-state reaction technique and found to crystallize in the monoclinic system with P2{sub 1/a} space group. The impedance plots are well fitted to two equivalent circuit models. The dc conductivity follows Arrhenius behavior with two different activation energies Ea(I) = 0.84 eV for T < 610 K and Ea(II) = 0.93 eV for T > 610 K. Actually, the values of activation energies obtained from the dc conductivity and the relaxation frequency are similar, and hence the transport in the titled compound can be described through a hopping mechanism, dominated by the motion of Li{sup +} ions. Besides, the frequency dependence of the conductivity is interpreted in terms of Jonscher’s law. The NSPT model and the CBH model is the most applicable conduction mechanism in region (I) and (II), respectively. The ion transport is due to the hopping of Li{sup +} ions along [100] tunnels direction. The conduction mechanism is studied with the help of Elliot’s theory, and the Elliot’s parameters are determined.
- OSTI ID:
- 22581564
- Journal Information:
- Materials Research Bulletin, Vol. 78; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACTIVATION ENERGY
ALUMINIUM PHOSPHATES
CERAMICS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRIC CONDUCTIVITY
FREQUENCY DEPENDENCE
IMPEDANCE
LITHIUM COMPOUNDS
LITHIUM IONS
MONOCLINIC LATTICES
RAMAN SPECTROSCOPY
RELAXATION
SOLIDS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
YOUNG MODULUS