Premium
Electrical conductivity and thermoelectric power of lithium‐cadmium ferrites
Author(s) -
Ravinder D.,
Rao T. Seshagiri
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250820
Subject(s) - seebeck coefficient , cadmium , curie temperature , electrical resistivity and conductivity , materials science , thermoelectric effect , crystallite , analytical chemistry (journal) , ferrite (magnet) , lithium (medication) , condensed matter physics , chemistry , ferromagnetism , metallurgy , thermodynamics , thermal conductivity , composite material , physics , medicine , chromatography , quantum mechanics , endocrinology
The electrical conductivity (σ) and thermoelectric power ( Q ) of polycrystalline lithiumcadmium ferrites having the chemical formula Li 0.5– x /2 Cd x Fe 2.5– x /2 O 4 where ( x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) have been investigated as a function of temperature. Lithium‐cadmium ferrite with x = 0.4 is found to possess minimum electrical conductivity and lowest Seebeck coefficient. Plots of log (σ T ) versus 10 3 T are almost linear and have shown a transition near the Curie temperature except in the case of cadmium ferrite. The Seebeck coefficient is negative for all the compositions showing that these ferrites behave as n‐type semiconductors. The values of charge carrier concentration and mobility have also been computed. The properties of cadmium‐substituted lithium ferrites have been correlated with those of zinc‐substituted lithium ferrites, cadmium and zinc being two non‐magnetic divalent ions occupying essentially tetrahedral A sites when substituted in ferrites.