Cation Diffusion Coefficients and Vacancy Densities in Mn-Zn Ferrites
- 1 August 1967
- journal article
- research article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 23 (2) , 179-184
- https://doi.org/10.1143/jpsj.23.179
Abstract
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 Fe varied with the oxygen content, i.e. , the density of cation vacancies in the sample. Activation energy of the diffusion was 1.50±0.05 eV, being independent of the vacancy density. This value means the migration energy of vacancies. (2) The volume diffusion coefficients obtained were same for 54 Mn, 59 Fe, 60 Co and 65 Zn, but slightly different for 45 Ca. (3) The grain boundary diffusion coefficient was as sensitive as the volume diffusion coefficient to sintering atmospheres.Keywords
This publication has 5 references indexed in Scilit:
- Exact Solutions of Two Ideal Cases in Grain Boundary Diffusion Problem and the Application to Sectioning MethodJournal of the Physics Society Japan, 1964
- Equilibrium Atmosphere Schedules for the Cooling of FerritesJournal of Applied Physics, 1961
- Time Decrease of Magnetic Permeability in Some Mixed FerritesJournal of the Physics Society Japan, 1961
- Grain Boundary and Lattice Diffusion in Polycrystalline BodiesJournal of Applied Physics, 1960
- A Precision Grinding Machine for Diffusion StudiesReview of Scientific Instruments, 1954