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• W2011982164 abstract "The electric, thermoelectric and magnetic properties were studied as a function of temperature and composition for a series of Ba2Ni2−xZnxFe12O22 Y-type hexaferrite samples (with x=0, 0.4, 0.8, 1.2, 1.6 and 2) prepared using the usual ceramic technique. The experimental results indicated that the DC electrical conductivity σDC, thermoelectric power α, diff mobility μd, carrier concentration n and initial magnetic permeability μi increase whereas the Fermi energy EF decreases as the temperature increases. α has a negative sign for all samples indicating that the majority of electric charge carriers are electrons. The study of initial magnetic permeability showed two peaks on μi–T curves. The first peak nearly appears at Curie temperature Tc for all samples except for the sample with x=2 while the second peak Ts appears below room temperature for all samples. Tc decreases due to the replacement of non-magnetic Zn2+ ions to magnetic Ni2+ ions. μi, activation energies for hopping EH, for carrier generation Eg and for electric conduction (E1,E2 and E3 in regions I, II and III) decreases to reach minimum at x=1.2 and start to increase for x>1.2. Each of σDC, α, n, μd and energy at donor level ED increase as the substitution of non-magnetic Zn2+ ions to magnetic Ni2+ ions increase reaching maximum at x=1.2 and start to decreases for x>1.2. The small values of μd and its strong temperature-dependence (exponential relation) indicate that the hopping conduction mechanism is predominant at high temperatures in region III. In region II, the band conduction mechanism shares in electric conduction process beside the hopping conduction mechanism. The band conduction mechanism is predominant in region I." @default.
• W2011982164 created "2016-06-24" @default.
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• W2011982164 date "1999-06-01" @default.
• W2011982164 modified "2023-10-17" @default.
• W2011982164 title "Semiconductivity in Ba2Ni2−xZnxFe12O22 Y-type hexaferrites" @default.
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• W2011982164 doi "https://doi.org/10.1016/s0304-8853(99)00120-1" @default.
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