Enhanced magnetic and dielectric properties of Ti-doped YFeO3 ceramics

Madolappa, Shivanand and Ponraj, Bharathi and Bhimireddi, Rajasekhar and Varma, Kalidindi BR (2017) Enhanced magnetic and dielectric properties of Ti-doped YFeO3 ceramics. In: Journal of the American Ceramic Society, 100 (6). pp. 2641-2650. ISSN 00027820

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Abstract

Polycrystalline YFeO3 (YFO) and YFe1−(4/3)xTixO3(YFTO) ceramics were prepared using the powder synthesized from the sol-gel route. X-ray diffraction analyses of the polycrystalline ceramics revealed the crystallization of the phase in orthorhombic crystal structure associated with the space group Pnma. The magnetization versus magnetic field hysteresis loops were obtained at room temperature for YFO and YFTO ceramics. The magnetic property changes from weak ferromagnetic in YFO to ferromagnetic in YFTO ceramics. The dielectric constant recorded at room temperature for YFTO ceramics was six times higher than that of YFO, whereas the dielectric loss gets reduced to 0.06 from 0.3 for YFO at 1 kHz. Impedance spectroscopy study carried out on YFO and YFTO ceramics confirmed the existence of non-Debye-type relaxation. Observed single semicircle in Z′ vs −Z′′ plot established the incidence of intrinsic (bulk) effect and ruled out any grain boundary or electrode effects. The mechanism for the dielectric relaxation and electrical conduction process observed in YFO and YFTO ceramics was discussed by invoking electric modulus formalisms. Activation energy obtained by ac conductivity study suggested that the conduction process in YFO was linked up with the existence of the polaron and oxygen vacancies, whereas only oxygen vacancies contribute to the conduction process in YFTO ceramics.

Item Type:	Journal Article
Publication:	Journal of the American Ceramic Society
Publisher:	Blackwell Publishing Inc.
Additional Information:	The copyright for this article belongs to the Blackwell Publishing Inc.
Keywords:	dielectric relaxation; magnetic materials/properties; magnetoelectrics; sol-gel
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	14 Jun 2022 05:09
Last Modified:	14 Jun 2022 05:09
URI:	https://eprints.iisc.ac.in/id/eprint/73430

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