2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1990 | 1989 | 1988 | 1987 | 1986 | 1985 | 1984 | 1983 | 1982 | 1981 | 1980 | 1979 | 1978 | 1977 | 1976 | 1975 | 1974 | 1973 | 1972 | 1971 | 1970 | 1969 | 1968 | 1967 | 1966 | 1965 | 1964 | 1963 | 1962 | 1961 | 500 | 0
Analysis of structural, electrical, and magnetic properties of Sr0.5Ca0.5Fe12O19 and Ba0.5Ca0.5Fe12O19 for advanced technological application
Authors: Hantech, M.; Dhahri, R.; Dhahri, E.; Costa, B.F.O.
Ref.: Ceram. Int. 51(20B), 31734-31746 (2025)
Abstract: This study investigates the impact of calcium substitution on the structural, magnetic, and electrical conductivity properties of barium and strontium hexaferrites. X-ray diffraction analysis confirms that all samples retain a hexagonal crystal structure P63/mmc, with calcium incorporation maintaining lattice symmetry. The results align with the Aharoni model, showing an enhanced magnetic saturation and high transition temperature, making the material suitable for high-temperature electronic devices and applications requiring strong permanent magnets. Electrical conductivity measurements indicate semiconductor behavior consistent with Jonscher´s power law, with conduction mechanisms identified as Non-Overlapping Small Polaron Tunneling and Correlated Barrier Hopping. The activation energy for conduction in the high-temperature range was determined via the Small Polaron Hopping model, while lower-temperature conductivity was explained by Mott and Shklovskii-Efros Variable Range Hopping models. The Ghosh scaling model further confirmed that conductivity is influenced by Coulomb interactions between carriers.
