Cation Diffusion Coefficients and Vacancy Densities in Mn-Zn Ferrites
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概要
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Cation diffusion in Mn-Zn ferrites having excess iron was investigated by means of the isotope tracer method using single and polycrystalline samples. In polycrystalline samples "volume diffusion" and "grain boundary diffusion" were observed and separated from each other. The results are: (1) The volume diffusion coefficient of ^59<F>e varied with the oxygen content, i.e., the density of cation vacancies in the sample. Activation energy of the diffusion was 1.50±0.05eV, being independent of the vacancy density. This value means the migration energy of vacancies. (2) The volume diffusion coefficients obtained were same for ^54<M>n, ^59<F>e, ^60<C>o and ^65<Z>n, but slightly different for ^45<C>a. (3) The grain boundary diffusion coefficient was as sensitive as the volume diffusion coefficient to sintering atmospheres.
- 社団法人日本物理学会の論文
- 1967-08-05
著者
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Nakagawa Yasuaki
Department Of Electronics Tohoku Institute Of Technology
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Ogawa Seiya
Department Of Material Research Fujitsu Laboratory
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Ogawa Seiya
Department Of Material Research Fujitsu Laboratories
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Nakagawa Yasuaki
Department Of Physics Faculty Of Science Gakushuin University
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