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Magnetic Ceramics: VII, Effect of Iron Oxide Particle Size on Nickel Ferrite Formation
Author(s) -
ECONOMOS GEORGE,
CLEVENGER T. R.
Publication year - 1960
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1960.tb09152.x
Subject(s) - materials science , particle size , iron oxide , ferrite (magnet) , nickel , particle size distribution , nickel oxide , metallurgy , ceramic , oxide , mineralogy , chemical engineering , composite material , chemistry , engineering
Five iron oxides of increasing particle‐size distribution, mixed with nickel oxide of a constant‐size range, were heated at various temperatures and time intervals. The extent of nickel ferrite formation, as influenced by particle‐size distribution of the iron oxide constituent, was measured with a compensating‐coil magnetometer. Using the Jander relation for this type of reaction, activation energies ranging from 54 to 70 kcal. were computed for increasing particle size. These results are examined and compared with current procedures for the production of ferrite powders.