Barium hexaferrite (M-phase) exhibiting superstructure

Journal Article · Tue May 01 00:00:00 EDT 1984 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(84)90136-3· OSTI ID:5088379

Ganapathi, L; Gopalakrishnan, J; Rao, C N.R.

Barium hexaferrite (M-phase) prepared by the flux method is found to exhibit a ..sqrt..3a x ..sqrt..3a superstructure similar to barium hexaaluminate. Morgan and Shaw as well as Iyi et al have recently reported the formation of a barium-rich phase of barium hexaaluminate possessing a ..sqrt..3a x ..sqrt..3a superstructure of the magnetoplumbite structure. In view of the similarities between the layer structures of ..beta..-aluminas and the corresponding ferrites the authors have been carrying out electron microscopic investigations of potassium ..beta..-alumina and BaA1/sub 12/O/sub 19/ along with ferrites of similar compositions. They have obtained electron diffraction patterns of barium hexaaluminate identical to those obtained by Morgan and Shaw and Iyi et al, but more interestingly, they have found a phase of barium hexaferrite (M-phase) exhibiting the ..sqrt..3a x ..sqrt..3a superstructure.

• Research Organization: Solid State and Structural Chemistry Unit Indian Institute of Science Bangalore
• OSTI ID: 5088379
• Journal Information: Mater. Res. Bull.; (United States), Vol. 19:5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
FERRITES
ALUMINIUM OXIDES
ELECTRON DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
FERRIMAGNETIC MATERIALS
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360601* - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies