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Structural and electrical properties of Sr 3 V 2 O 8 ceramics
Author(s) -
Khatri Praveen,
Behera Banarji,
Choudhary R. N. P.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200844325
Subject(s) - temperature coefficient , electrical resistivity and conductivity , materials science , dielectric , arrhenius equation , crystallite , analytical chemistry (journal) , arrhenius plot , ceramic , atmospheric temperature range , scanning electron microscope , conductivity , mineralogy , oxide , condensed matter physics , chemistry , composite material , activation energy , thermodynamics , metallurgy , organic chemistry , physics , optoelectronics , chromatography , electrical engineering , engineering
Abstract A polycrystalline sample of Sr 3 V 2 O 8 was prepared by a mixed oxide method at relatively low temperature (<1000 °C). Preliminary structural analysis confirms the formation of single‐phase compound in the hexagonal (rhombohedral) crystal system at room temperature. Microstructural studies using a scanning electron microscope (SEM) show that the compound has well‐defined grains. These grains are distributed uniformly throughout the surface. The dielectric property (i.e. dielectric constant) of the compound studied in a wide range of frequency (10 2 –10 6 Hz) at different temperatures (25–500 °C) exhibits a small anomaly at 300 °C. The real and imaginary parts of the complex impedance trace single semicircles in the complex plane. The temperature‐dependent plots reveal the presence of bulk effect only. The bulk resistance of the material decreases with rise in temperature. This exhibits a typical negative temperature coefficient of resistance (NTCR) behaviour of the material. Detailed studies of electrical modulus exhibit an important role of the hopping mechanism in the electrical transport process of the material. The nature of the variation of the dc conductivity suggests an Arrhenius type of electrical conductivity. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)