Premium
Sintering of Lithium Zinc Ferrites with Alkoxide‐Derived Borosilicate Liquid Phase
Author(s) -
Brooks Keith G.,
Amarakoon Vasantha R. W.
Publication year - 1991
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.1151-2916.1991.tb06793.x
Subject(s) - borosilicate glass , sintering , materials science , microstructure , alkoxide , phase (matter) , mineralogy , zinc , metallurgy , composite material , chemistry , biochemistry , organic chemistry , catalysis
Lithium zinc ferrites (Li 0.3 Zn 0.4 Mn 0.05 Fe 2.25 O 4 ) of > 97% theoretical density were prepared with alkoxide‐derived borosilicate sintering additive. A sol‐gel technique was used to incorporate the borosilicate phase prior to sintering. The effects of borosilicate composition and additive quantity on microstructural development and densification are reported. Direct current resistivity, dynamic hysteresis, and microwave property data are discussed in terms of processing parameters and resultant microstructures. The microstructure of the sintered ferrites was analyzed using SEM and TEM. Heterogeneities including regions of liquid‐phase coalescence and intragranularly included glass phase were observed in some cases. These microstructural features were shown to have deleterious effects on microwave magnetic properties when compared to those of commercial ferrites of the same nominal composition sintered with Bi 2 O 3 additive.