5 years ago

Evidence of Cr3+ and Cr4+ Coexistence in Chromium-Doped SnO2 Nanoparticles: A Structural and Magnetic Study

Evidence of Cr3+ and Cr4+ Coexistence in Chromium-Doped SnO2 Nanoparticles: A Structural and Magnetic Study
Paulo C. Morais, Waldemar A. A. Macedo, José A. H. Coaquira, Xavier Gratens, Fermin H. Aragón, Valmir A. Chitta, Juan C. R. Aquino, Ismael Gonzales
The present study reports the successful synthesis of Sn1–xCrxO2 nanoparticles with doping content (x) ranging from 0 to 0.20. Samples were synthesized by a polymer precursor method using SnCl2·H2O and Cr(NO3)3·5H2O 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 (Cr3+ and Cr4+). X-ray photoelectron spectroscopy measurements confirm the coexistence of Cr3+ and Cr4+ ions in excellent agreement with the monotonic decrease of the [Cr3+]/[Cr4+] versus doping content (x), assessed from the fitting of the susceptibility versus temperature data using the Curie–Weiss law.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06054

DOI: 10.1021/acs.jpcc.7b06054

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