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Dielectric and electrical properties of Sr 5 EuCr 3 Nb 7 O 30 nanoceramics prepared using a novel chemical route
Author(s) -
Ranga Raju M. R.,
Choudhary R. N. P.,
Ram S.
Publication year - 2003
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.200301832
Subject(s) - electrical resistivity and conductivity , materials science , dielectric , orthorhombic crystal system , dissipation factor , analytical chemistry (journal) , atmospheric temperature range , tungsten , crystallite , dielectric loss , temperature coefficient , mineralogy , crystal structure , crystallography , chemistry , metallurgy , thermodynamics , composite material , physics , optoelectronics , engineering , chromatography , electrical engineering
Polycrystalline samples of Sr 5 EuCr 3 Nb 7 O 30 , a member of the tungsten bronze (TB) family, have been prepared by a novel chemical precursor route with a chemical dispersion and mixing of the metal cations in an acidic solution. Preliminary structural studies have been carried out using X‐ray diffraction of samples heated at different temperatures, in the 973 to 1173 K range, from the precursor. They confirm the formation of the single‐phase compound in an orthorhombic structure at room temperature. The dielectric constant ( ε ) and tangent loss (tan δ ) of the samples have been measured as a function of both frequency (10 2 –10 5 kHz) and temperature (300–700 K). None of the samples shows any dielectric anomaly. Impedance spectroscopic data are explored to gain an insight into the electrical properties and the relaxation behaviors. The measurement of the conductivity as a function of temperature suggests that the samples have a negative temperature coefficient of resistivity in a typical semiconductor behavior.