Electrical conductivity and thermoelectric power of lithium-cadmium ferrites

✍ Scribed by Dr. D. Ravinder; T. Seshagiri Rao

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 329 KB
• Volume: 25
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170250820

✦ Synopsis

The electrical conductivity (a) and thermoelectric power (Q) of polycrystalline lithiumcadmium ferrites having the chemical formula Li,,,,Cd,Fe,,,204 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 (oT) versus 103/Tare 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.