Effect of La substitution on structure and magnetic properties of sol-gel prepared BiFeO{sub 3}
- School of Physics, University of Hyderabad, Gachibowli, Hyderabad 500 046 (India)
Detailed Rietveld analysis of the room temperature (RT) x-ray diffraction data of La{sub x}Bi{sub 1-x}FeO{sub 3} (LBFO) ceramics (0 {<=} x {<=} 0.4) prepared by sol-gel route revealed that the system retains distorted rhombohedral R3c structure of parent compound BiFeO{sub 3} (BFO) for x {<=} 0.2 but transforms to orthorhombic Pbnm structure for x > 0.2. The fundamental 12 Raman modes of pure BFO (x = 0.0) are reduced to 10 modes for x = 0.2 and further reduced to 7 modes for x = 0.4, which is a clear indication of structural modification and symmetry changes brought about by La doping. The coercive field, H{sub C}, increases remarkably with an increase in La doping and x = 0.4 exhibits the highest H{sub C} (19.5 kOe at RT) reported so far in any rare earth doped BFO, which will have a great potential for practical application in non-volatile memory devices. Moreover, high-field magnetization and remanence, M{sub r}, increase linearly with La doping content due to the gradual change in spin cycloid structure. M(T) curve shows an anomaly at 50 K, similar to that expected in a spin glass system. The Neel temperature (T{sub N}) of the LBFO increases with x, approaching that of the LaFeO{sub 3}.
- OSTI ID:
- 22102405
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 113; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
CERAMICS
COERCIVE FORCE
CRYSTAL STRUCTURE
DOPED MATERIALS
FERRITES
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
MEMORY DEVICES
NEEL TEMPERATURE
ORTHORHOMBIC LATTICES
RAMAN SPECTRA
SOL-GEL PROCESS
SPIN
SPIN GLASS STATE
SYMMETRY
TRIGONAL LATTICES
X-RAY DIFFRACTION