Bhasin, Tanv and Agarwal, Ashish and Sanghi, Sujata and Kotnala, R. K. and Shah, Jyoti and Yadav, Manisha and Tuteja, Muskaan (2018) Study of crystal structure, dielectric, magnetic and magnetoelecrtic properties of xCoFe(2)O(4)-(1-x)Na0.5Bi0.5TiO3 composites. Ceramics International, 44 (7). pp. 7629-7636. ISSN 0272-8842

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Abstract

Multiferroic composites of spinel ferrite and ferroelectric xCoFe(2)O(4) - (1-x)Na0.5Bi0.5TiO3 (with x = 0.10,0.30,0.50) were efficiently prepared by standard solid state reaction mechanism. X-ray diffractometer was used to analyze crystal structure of the prepared composites. The observed XRD patterns of the composites comprise peaks of both the phases i.e. ferrite and ferroelectric, with no sign of secondary peaks. Rietveld refinement of XRD data further confirms the coexistence of these two phases with cubic (Fd3m) and rhombohedral (R3c) symmetry corresponding to ferrite and ferroelectric phase respectively. The 3-dimensional overview of crystal structure of pure CoFe2O4 and Na0.5Bi0.5TiO3 and of composite 0.50CoFe(2)O(4) - 0.50Na(0.5)Bi(0.5)TiO(3) is generated by using refined parameters. The dielectric constant (epsilon') and dielectric loss (tan delta) values were recorded as a function of frequency ranging from 100 Hz to 7 MHz and at different temperatures. Both epsilon' and tan delta follow dispersion pattern at lower frequencies while show frequency independent behavior at higher frequencies. The magnetic evaluation carried by analyzing M-H hysteresis loop reveals the ferrimagnetic characteristics of these composites. The highest value of magnetic moment is 1.12 mu(B) observed for composite 0.50CoFe(2)O(4) - 0.50Na(0.5)Bi(0.5)TiO(3). Magnetoelectric (ME) voltage coefficient (alpha) was also demonstrated to observe the interaction between ferrite and ferroelectric phases. The highest value of alpha (72.72 mu V/Oe cm) is obtained for low ferrite composition 0.10CoFe(2)O(4) - 0.90Na(0.5)Bi(0.5)TiO(3), which suggests the dependence of magnetoelectric response on the resistivity of the composites.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	27 Mar 2019 11:38
Last Modified:	27 Mar 2019 11:38
URI:	http://npl.csircentral.net/id/eprint/4009

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