Crystal structure and properties of Bi{sub 1-x}Ca{sub x}FeO{sub 3} and Bi{sub 1-x}Ca{sub x}FeO{sub 1-x}Ti{sub x}O{sub 3} solid solutions
Journal Article
·
· Journal of Experimental and Theoretical Physics
- National Academy of Sciences of Belarus, Joint Institute of Solid State and Semiconductor Physics (Belarus)
- Hahn-Maitner Institute (Germany)
- Institute of Electronic Materials Technology (Poland)
- Polish Academy of Sciences, Institute of Physics (Poland)
Systems of solid solutions Bi{sub 1-x}Ca{sub x}FeO{sub 3} (I) and Bi{sub 1-x}CaxFeO{sub 1-x}Ti{sub x}O{sub 3} (II) have been obtained and their properties have been studied using neutronography and Moessbauer spectroscopy; magnetization and permittivity have been measured. It is shown that an increase in the concentration of calcium ions in system I for x > 0.2 changes rhombohedral distortions of a unit cell (space group R3c) to tetragonal distortions (space group I4/mcm), while rhombohedral distortions in system II for x > 0.2 are replaced by orthorhombic distortions (space group Pnma). Analysis of the crystal structure has revealed strong anisotropy in vibrations of Bi and O ions in system I compounds. Systems I and II are characterized by G-type antiferromagnetic ordering of magnetic moments. In system II, spontaneous magnetization associated with the Dzyaloshinskii-Moriya interaction has been detected. According to Moessbauer spectroscopy data, iron ions in compounds I and II are in the trivalent state and charge compensation occurs due to the formation of oxygen vacancies. The permittivity increases with the calcium concentration.
- OSTI ID:
- 21241978
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 1 Vol. 107; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ANISOTROPY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
BISMUTH IONS
CALCIUM COMPOUNDS
CALCIUM IONS
IRON IONS
IRON OXIDES
MAGNETIC MOMENTS
MAGNETIZATION
MOESSBAUER EFFECT
ORTHORHOMBIC LATTICES
OXYGEN IONS
PERMITTIVITY
SOLID SOLUTIONS
SPACE GROUPS
TETRAGONAL LATTICES
TITANATES
TRIGONAL LATTICES
VACANCIES
ANISOTROPY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
BISMUTH IONS
CALCIUM COMPOUNDS
CALCIUM IONS
IRON IONS
IRON OXIDES
MAGNETIC MOMENTS
MAGNETIZATION
MOESSBAUER EFFECT
ORTHORHOMBIC LATTICES
OXYGEN IONS
PERMITTIVITY
SOLID SOLUTIONS
SPACE GROUPS
TETRAGONAL LATTICES
TITANATES
TRIGONAL LATTICES
VACANCIES