Electrical conductivity of cobalt-doped BaZn hexagonal ferrites

• Published in: Journal of magnetism and magnetic materials Vol. 205; no. 2; pp. 319 - 322
• Main Authors: El-Saadawy, M., Barakat, M.M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1999; Elsevier Science
• Subjects: Barium ferrites; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Electrical properties; Electronic transport in condensed matter; Exact sciences and technology; Hexagonal ferrites; Mobility; Mobility edges ; hopping transport; Physics; Thermo electric power; Thermoelectric and thermomagnetic effects; Mobility; Hexagonal ferrites; Thermo electric power; Electrical properties; Barium ferrites; Temperature dependence; Inorganic compounds; Electrical conductivity; n-type conductors; Transition element compounds; Measuring methods; Instrumentation; Cobalt oxides; Hopping conductivity; Composition effect; Experimental study; Thermoelectric properties; Ferrites; Hexagonal lattices; Zinc oxides; Multi-element compounds; Barium oxides; Crystallographic site; Iron oxides; Carrier mobility; Spin state
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(99)00447-3

Electrical conductivity and mobility studies of BaZn 2− x Co x Fe 16O 27 ( x=0.0, 0.2, 0.5, 0.7, 0.9, 1.1 and 1.3) hexagonal ferrites as a function of composition and temperature range 300–600 K are reported. The negative sign of these compositions indicated the n-type conduction which is predominantly due to the hopping of electrons between Fe 2+ and Fe 3+ ions at the octahedral sites. The mobility increases with rising temperature which is attributed to enhancing the rate of hopping electrons. The thermoelectric power increases as the cobalt concentration increases up to x=1.1 and then decreases for higher concentration. This is attributed to spin up position for x<1.1 and spin down positions for x>1.1.