Dielectric, magnetic, and lattice dynamics properties of Y-type hexaferrite Ba{sub 0.5}Sr{sub 1.5}Zn{sub 2}Fe{sub 12}O{sub 22}: Comparison of ceramics and single crystals

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3402379· OSTI ID:21476263

Kamba, S; Goian, V; Savinov, M; Buixaderas, E; Nuzhnyy, D; Marysko, M; Kempa, M; Bovtun, V; Hlinka, J; Knizek, K; Vanek, P; Novak, P ^[1]; Bursik, J ^[2]; Hiraoka, Y; Kimura, T ^[3]; Kouril, K; Stepankova, H ^[4]

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1. Institute of Physics, ASCR, Na Slovance 2, 18221 Prague 8 (Czech Republic)
2. Institute of Inorganic Chemistry, ASCR, 25068 Rez (Czech Republic)
3. Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531 (Japan)
4. Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Prague 8 (Czech Republic)

We prepared multiferroic Y-type hexaferrite Ba{sub 0.5}Sr{sub 1.5}Zn{sub 2}Fe{sub 12}O{sub 22} ceramics and compared their magnetic and dielectric properties with single crystal. Magnetic susceptibility and microwave resonance measurement revealed magnetic phase transition at T{sub C}=312 K, similar as in single crystal. Ferroelectric (FE) phase can be induced by external magnetic field in all investigated samples and the phase diagram in ceramics qualitatively resembles that of the single crystal. The range of magnetic fields, where the FE phase is induced, broadens after annealing of single crystal. Ceramics quenched after sintering exhibit several orders of magnitude lower conductivity than the single crystal. Heavily damped magnetic resonance was discovered in terahertz spectra at 10 K and its frequency softens below 5 GHz near T{sub C}. Number and symmetry of observed infrared (IR) and Raman active phonons correspond to paraelectric phase with D{sub 3d}{sup 5} hexagonal structure. No evidence for a structural phase transition was found in the IR and Raman spectra on cooling (in zero magnetic field) or in the room-temperature IR spectra with external static magnetic field up to 0.3 T.

• OSTI ID: 21476263
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 10; Other Information: DOI: 10.1063/1.3402379; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
CERAMICS
COMPARATIVE EVALUATIONS
DIELECTRIC PROPERTIES
FERRITES
FERROELECTRIC MATERIALS
GHZ RANGE
HEXAGONAL LATTICES
INFRARED SPECTRA
MAGNETIC FIELDS
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHONONS
RAMAN SPECTRA
SINTERING
STRONTIUM COMPOUNDS
ZINC COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIAGRAMS
DIELECTRIC MATERIALS
ELECTRICAL PROPERTIES
EVALUATION
FABRICATION
FERRIMAGNETIC MATERIALS
FREQUENCY RANGE
INFORMATION
IRON COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
RESONANCE
SPECTRA
TRANSITION ELEMENT COMPOUNDS