Sarin, Neha and Mishra, Monu and Gupta, Govind and Arora, Manju and Luthra, Vandna (2018) Deciphering the Role of Oxygen Vacancies on Structural, Electrical, and Magnetic Properties of Fe-Substituted Strontium Titanate. Physica status solidi (b), 255 (8). pp. 1700683-1700690. ISSN 0370-1972

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Abstract

A comprehensive investigation of incorporation of Fe into SrTiO3 is reported. SrFexTi1-xO3- (x=0.0 - 0.3) powders are prepared via solid state route. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques are used to analyze the phase formation, surface chemistry, and electronic structure while scanning electron microscope (SEM) is employed to investigate the surface morphology and microstructural properties. The electrical and magnetic properties are studied at room temperature (RT) to explore the effect of iron substitution on the current conduction and magnetic phase transformation. XPS results indicate the presence of mixed valence state as Fe content increased resulting in considerable enhancement of oxygen vacancies. Moreover, a continuous decrease in Fermi level (FL) is observed as Fe concentration is increased. The increment in Fe concentration leads to variation of current-voltage (I-V) characteristics from linear to non-linear. Magnetic measurements demonstrate three behaviors; an intrinsic diamagnetic behavior (x=0.0, 0.05) followed by ferromagnetic behavior (x=0.1, 0.2), and finally a paramagnetic behavior (x=0.3) due to transition metal impurities and defects. These studies have been used to establish correlation between the evolution of oxygen vacancies emanating from Fe-substitution on structural, electrical, and magnetic properties.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Wiley-VCH Verlag.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	16 Dec 2019 11:48
Last Modified:	16 Dec 2019 11:48
URI:	http://npl.csircentral.net/id/eprint/3808

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