Lattice effects on the multiferroic characteristics of (La, Ho) co-substituted BiFeO3

Suresh, P and Hazra, BK and Kumar, BR and Chakraborty, T and Babu, PD and Srinath, S (2021) Lattice effects on the multiferroic characteristics of (La, Ho) co-substituted BiFeO3. In: Journal of Alloys and Compounds, 863 .

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Abstract

The influence of La3+ and Ho3+ co-substitution on the structural, electrical and magnetic properties of rhombohedrally distorted polycrystalline BiFeO3 is reported. The presence of a tiny residual secondary phase of Bi2Fe4O9, Bi25FeO40 is evident in all the samples, while La doping suppresses the impurity phase and favors the grain growth (size of 1�2 µm) of the pristine compound. A fivefold increase in the dielectric constant (230 at 1 MHz) is achieved for the samples with the highest La content with a remarkable reduction in the dielectric loss. LaxHoyBi1-(x+y)FeO3 ceramics exhibit lossy ferroelectric loops and the magnitude of polarization reduces upon the co-substitution. The antiferromagnetic BiFeO3 transforms to ferromagnetic at low temperatures due to the annihilation of the cycloid-spin structure. The co-substitution effectively improved the magnetic properties. �Ho� substitution helps in achieving the enhanced magnetization values while �La� substitution helps in increasing the magnetic coercivity, HC. The variation of the HC with the temperature is interpreted by means of the two sublattice model. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	04 Mar 2021 09:41
Last Modified:	04 Mar 2021 09:41
URI:	http://eprints.iisc.ac.in/id/eprint/67919

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