Composition limits and magnetic properties of sintered Y/sub 2/ /sub 66/Gd/sub 0/ /sub 34/Fe/sub x/Al/sub 0/ /sub 677/Mn/sub 0/ /sub 09/O/sub 12/ garnets
Journal Article
·
· J. Am. Ceram. Soc.; (United States)
- General Electric Co., Schenectady, NY
Single-phase garnet solid solutions can be synthesized between the composition limits of x = 4.18 and x = 4.22 in Y/sub 2/./sub 66/Gd/sub 0/./sub 34/ Fe/sub x/Al/sub 0/./sub 677/Mn/sub 0/./sub 09/O/sub 12/ at temperatures between 1340 and 1500/sup 0/C in O/sub 2/. Solid solutions occur only on the Y/sub 2/O/sub 3/-excess side of the stoichiometric garnet composition. Electromagnetic properties and microstructural features of sintered garnets depend critically on small changes in Fe content in the vicinity of the garnet solid-solution region. An intergranular spinel-type second phase exists for compositions when x is greater than 4.22 and has a deleterious effect on remanent induction and magnetic loss at 3 GHz. The relative density of powder compacts sintered for 16 h at 1500/sup 0/C in O/sub 2/ increases with increasing Fe content (i.e., as x increases) in the garnet solid solution. (auth)
- OSTI ID:
- 7351322
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 59:5/6; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DISPERSIONS
FERRITE GARNETS
GADOLINIUM COMPOUNDS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MICROSTRUCTURE
MINERALS
MIXTURES
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERED MATERIALS
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DISPERSIONS
FERRITE GARNETS
GADOLINIUM COMPOUNDS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MICROSTRUCTURE
MINERALS
MIXTURES
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERED MATERIALS
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS