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The present study reports the successful synthesis of Sn 1−x Cr x O 2 nanoparticles with doping content (x) ranging from 0 to 0.20. Samples were synthesized by a polymer precursor method using SnCl 2 •H 2 O and Cr(NO 3 ) 3 •5H 2 O as metal ion suppliers. In all samples X-ray diffraction data show one single-phase formation (rutile-type), with crystalline size (crystal strain) decreasing (increasing) monotonically while increasing the x content, which are assigned to substitutional solution of Cr and Sn ions in the crystalline structure. In addition to a weak magnetic ordering observed in a few samples (x = 0.01, 0.02, 0.03, and 0.05), paramagnetism is the main magnetic contribution in all synthesized samples, which is due to the presence of two chromium ions (Cr 3+ and Cr 4+ ). X-ray photoelectron spectroscopy measurements confirm the coexistence of Cr 3+ and Cr 4+ ions in excellent agreement with the monotonic decrease of the [Cr 3+ ]/[Cr 4+ ] versus doping content (x), assessed from the fitting of the susceptibility versus temperature data using the Curie−Weiss law.

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In this work, we present a coupled experimental and theoretical first-principles investigation on one of the more promising oxide-diluted magnetic semiconductors, the Sn1−xCoxO2 nanoparticle system, in order to see the effect of cobalt doping on the physical and chemical properties.