Electrical Properties of High-Density Iron-Deficient Nickel-Zinc Ferrites

Autor:	H. L. Turk, D. R. Secrist
Rok vydání:	1970
Předmět:	Materials science Metallurgy Analytical chemistry chemistry.chemical_element Sintering Zinc Dielectric Grain size Nickel chemistry Electrical resistivity and conductivity Seebeck coefficient Materials Chemistry Ceramics and Composites Ferrite (magnet)
Zdroj:	Journal of the American Ceramic Society. 53:683-686
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1970.tb12042.x
Popis:	The dc resistivity of nickel-zinc ferrite was studied as a function of nickel/zinc ratio, apparent density, temperature, and grain size. Resistivities of Ni0.40Zn0.51Fe1.90O4– and Ni0.35Zn0.65-Fe1.90O4– are similar. Evaluation of samples sintered between 1100° and 1220°C showed that densification proceeds rapidly for sintering temperatures 1170°C; for these specimens the room temperature resistivity increases to an equilibrium value with sintering time. Samples sintered to 99+% of theoretical density at lower temperatures densify slowly; the resistivity is invariant with sintering time. The Seebeck coefficient for the p-type ferrites is 550 μV/°C from 200° to 700°C; the dielectric constant varies from 17.3 at 0.5 MHz to 16.4 at 15 MHz.
Databáze:	OpenAIRE
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