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Home > Issues > RetrieveStructural and Magnetic Properties of Cr-doped SnO2 Nanocrystalline Powders Based Dilute Magnetic Oxides
Journal of Magnetics, Volume 26, Number 3, 30 Sep 2021, Pages 256-264
Kwanruthai Wongsaprom * 
(Mahasarakham University), Akekapol Winyayong (Mahasarakham University), Supree Pinitsoontorn (Khon Kaen University), Pinit Kidkhunthod (Synchrotron Light Research Institute (Public Organization), 111 University Avenue), Somchai Sonsupap (Suranaree University of Technology Nakhon Ratchasima), Santi Maensiri (Suranaree University of Technology Nakhon Ratchasima)
(Mahasarakham University), Akekapol Winyayong (Mahasarakham University), Supree Pinitsoontorn (Khon Kaen University), Pinit Kidkhunthod (Synchrotron Light Research Institute (Public Organization), 111 University Avenue), Somchai Sonsupap (Suranaree University of Technology Nakhon Ratchasima), Santi Maensiri (Suranaree University of Technology Nakhon Ratchasima)
Abstract
The nanocrystalline powders of Cr-doped SnO2 with Cr-dopant concentrations of 2, 4 and 6 wt%, were
synthesized by a simple hydrothermal method. XRD results, along with the FT-IR and SAED patterns,
confirmed the formation of the SnO2’s tetragonal phase without other impurity phases. Optical analysis
revealed a significant decrease in the energy gap of the doped samples from 3.69 to 3.40 eV. X-ray absorption
spectroscopy, including x-ray absorption near-edge spectroscopy, was used to qualitatively investigate the
valence states of doped Cr. Room temperature ferromagnetism was observed in Cr-doped SnO2 samples. The
highest value of magnetization was found in SnO2 doped with 4 wt% of Cr (about 4.88 memu/g) and decreased
slightly as the Cr concentration increased. The reduction of magnetization with the increase of Cr content
happened because antiferromagnetic Cr-O-Cr super-exchange interaction took place within the nearest Cr3+
ions through O2 ions. The oxygen vacancies were induced by the ferromagnetism in the Cr-doped SnO2
nanocrystalline powders.
synthesized by a simple hydrothermal method. XRD results, along with the FT-IR and SAED patterns,
confirmed the formation of the SnO2’s tetragonal phase without other impurity phases. Optical analysis
revealed a significant decrease in the energy gap of the doped samples from 3.69 to 3.40 eV. X-ray absorption
spectroscopy, including x-ray absorption near-edge spectroscopy, was used to qualitatively investigate the
valence states of doped Cr. Room temperature ferromagnetism was observed in Cr-doped SnO2 samples. The
highest value of magnetization was found in SnO2 doped with 4 wt% of Cr (about 4.88 memu/g) and decreased
slightly as the Cr concentration increased. The reduction of magnetization with the increase of Cr content
happened because antiferromagnetic Cr-O-Cr super-exchange interaction took place within the nearest Cr3+
ions through O2 ions. The oxygen vacancies were induced by the ferromagnetism in the Cr-doped SnO2
nanocrystalline powders.
Keywords: Tin oxide; ferromagnetism; magnetic properties; dilute magnetic oxide; nanocrystalline powder
DOI: https://doi.org/10.4283/JMAG.2021.26.3.256
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