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Magnetic Ceramics: III, Effects of Fabrication Techniques on Magnetic Properties of Magnesium Ferrite
Author(s) -
ECONOMOS GEORGE
Publication year - 1955
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.1151-2916.1955.tb14957.x
Subject(s) - materials science , microstructure , ceramic , spinel , ferrite (magnet) , fabrication , magnesium , quenching (fluorescence) , analytical chemistry (journal) , mineralogy , oxygen , metallurgy , composite material , chemistry , optics , medicine , alternative medicine , physics , organic chemistry , pathology , chromatography , fluorescence
Magnesium ferrite specimens made of unreacted (mixed oxides) and reacted (ground ferrite) materials were prepared to determine the effects of forming pressure, firing temperature, time at peak temperature, firing atmosphere, and quenching treatment on their magnetic and electrical properties. High firing temperatures (1450°C.), long holding times (8 hours), and quenching from the highest temperature (1200°C.) produced the highest μ i , and B m , the lowest H c , and a decrease in B r . These changes were related to the change in the void volume and particle size of the specimens brought about by the fabrication techniques and to the alterations in the degree of inversion in the spinel lattice during quenching. Oxygen loss or gain from the stoichiometric amount caused a loss of magnetic properties. X‐ray and microstructure studies aided in the interpretation of the experimental data.