Ge-substituted ferroxplanes

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6182939

Naiden, E P; Ryabtsev, G I

We examined the formation of Ba/sub 3/Co/sub 2+x/Ge/sub x/Fe/sub 24-2x/O/sub 41/ substitutional solid solutions having the Z structure and the effects of Ge/sup 4 +/ on the major magnetic characteristics. We chose germanium for the following reasons. One anticipates that the tendency of Ge/sup 4 +/ (3d/sup 10/) to form sp/sup 3/ bonds will stabilize the ions in tetrahedral positions, which should increase the resultant magnetization. Since Ge/sup 4 +/ has a small ionic radius (0.44 A), the replacement may reduce the ionic separation and thus may strengthen the exchange interaction. We used polycrystalline ferrites made by ceramic technology and having x = 0.1 to examine how the phase composition varied with the sintering temperature by applying x-ray phase analysis to textured specimens. Specimens made at temperatures corresponding to the maximum Z phase yield were used in measuring the saturation magnetization in pulsed fields up to 4 x 10/sup 6/ A/m, while the anisotropy field was measured by the singular-point method, and the Curie temperature T/sub C/ and spin-orientation transition temperature T/sub t/ (from easy plane to easy axis) from the temperature dependence of the initial permeability.

• Research Organization: Tomsk State Univ. (USSR)
• OSTI ID: 6182939
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 24:3; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
CURIE POINT
DIAGRAMS
DIAMAGNETISM
DISPERSIONS
FABRICATION
FERRIMAGNETIC MATERIALS
FERRITES
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
HEAT TREATMENTS
ION EXCHANGE
IRON COMPOUNDS
IRON OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETISM
MAGNETIZATION
MATERIALS
METALLURGICAL EFFECTS
MIXTURES
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SINTERED MATERIALS
SINTERING
SOLID SOLUTIONS
SOLUTIONS
SPIN ORIENTATION
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VALENCE