Study of the structure and ferroelectric behavior of BaBi{sub 4-x}La{sub x}Ti{sub 4}O{sub 15} ceramics

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4917610· OSTI ID:22490203

Khokhar, Anita; Sreenivas, K. ^[1]; Goyal, Parveen K. ^[2]; Thakur, O. P. ^[3]

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1. Department of Physics & Astrophysics, University of Delhi, Delhi-110 007 (India)
2. Department of Physics, ARSD College, University of Delhi, Dhaula Kuan, New Delhi-110 021 (India)
3. Electroceramics Group, Solid State Physics Laboratory, Lucknow Road, Delhi 110 054 (India)

The structure and ferroelectric properties of Lanthanum substituted barium bismuth titanate BaBi{sub 4-x}La{sub x}Ti{sub 4}O{sub 15} (0 ≤ x ≤ 0.5) ceramics prepared by solid-state reaction method have been investigated. X-ray diffraction (XRD) confirms the formation of a single phase material. The distribution of lanthanum into the perovskite layers and (Bi{sub 2}O{sub 2}){sup 2+} layers of BaBi{sub 4}Ti{sub 4}O{sub 15} ceramics have been revealed through Raman spectroscopy. At lower value of x, it is seen that La{sup 3+} ions prefer to substitute A-site Bi{sup 3+} ions in the perovskite layers while for higher x values, La{sup 3+} ions get incorporated into the (Bi{sub 2}O{sub 2}){sup 2+} layers. A critical La content of x ∼ 0.2 in BaBi{sub 4-x}La{sub x}Ti{sub 4}O{sub 15} is seen to exhibit a large remnant polarization (P{sub r}) with low coercive field (E{sub c}). The improvement in the ferroelectric properties of La substituted BaBi{sub 4}Ti{sub 4}O{sub 15} ceramics has been explained in terms of changing oxygen vacancy concentration and structural relaxation. Tunable ferroelectric materials can be obtained by manipulating the doping amount of lanthanum ion.

• OSTI ID: 22490203
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1665; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH IONS
CERAMICS
CONCENTRATION RATIO
FERROELECTRIC MATERIALS
LANTHANUM COMPOUNDS
LANTHANUM IONS
LAYERS
PEROVSKITE
POLARIZATION
RAMAN SPECTROSCOPY
RELAXATION
SOLIDS
TITANATES
VACANCIES
X-RAY DIFFRACTION