Effect of local strain fields on the structural, Néel transition temperature and long range ferroelectric ordering in rare earth substituted Bi0.9 R0.1 FeO3 multiferroic ceramics (where, R = Gd3+ , Tb3+ , Dy3+ )

Thangavelu, K and T, Durga Rao and A, Srinivas and Asthana, Saket (2015) Effect of local strain fields on the structural, Néel transition temperature and long range ferroelectric ordering in rare earth substituted Bi0.9 R0.1 FeO3 multiferroic ceramics (where, R = Gd3+ , Tb3+ , Dy3+ ). Journal of Materials Science: Materials in Electronics, 26 (11). pp. 8676-8687. ISSN 0957-4522

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Abstract

X-ray diffraction analysis of BiFeO3 (BFO) and rare earth (R) substituted BiFeO3 (BRFO) ceramics revealed the pervoskite phase formation. Raman scattering measurements elucidated the weakening of Bi–O covalent bond and destabilization in FeO6 octahedral chains in BRFO ceramics. A variation in Fe–O bond length and modulation in FeO6 local environment were evidenced from UV–visible spectroscopic studies. A weak ferromagnetism along with high coercivity (H C ) values was observed for BRFO ceramics. Heat flow measurements revealed a reduction in Néel transition temperature (T N ) and a slight increase in Curie transition temperature (T C ). The suppression of long range ferroelectric ordering in BRFO ceramics were probed from the nature of endotherm corresponding to T C . The variation and nature of phase transitions in BRFO ceramics were explained based on a structural model by considering the local strain fields created by ordered oxygen displacements due to A-site cation disorder and size variance effects.

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IITH Creators:

IITH Creators	ORCiD
Asthana, Saket	http://orcid.org/0000-0002-6420-3304

Item Type:

Article

Uncontrolled Keywords:

Bond length; Ceramic materials; Coercive force; Dysprosium; Dysprosium compounds; Ferroelectricity; Gadolinium; Iron oxides; Rare earths; Spectroscopic analysis; Structural ceramics; Temperature; X ray diffraction analysis Curie transition temperature; Ferroelectric order; Local strain field; Multiferroic ceramics; Raman Scattering measurements; Spectroscopic studies; Structural modeling; Weak ferromagnetism

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Team Library

Date Deposited:

18 Aug 2015 03:46

Last Modified:

29 Aug 2017 09:37

URI:

http://raiithold.iith.ac.in/id/eprint/1864