Abstract
Mesoporous NiO–SiO2 (MCM-41) silica-matrix composites with various nickel oxide concentrations (NiO : SiO2 = 0.025 : 1 to 0.2 : 1) have been produced by oxide cocondensation under hydrothermal synthesis conditions in the presence of cetyltrimethylammonium bromide as a template and (2-cyanoethyl) triethoxysilane as an organosubstituted trialkoxysilane additive. X-ray diffraction data have been used to evaluate the maximum nickel(II) oxide concentration (NiO : SiO2 = 0.1 : 1) that allows the ordered mesopore structure of MCM-41 to persist in the silica-matrix composites. We have studied the magnetic properties of this material as functions of temperature and magnetic field. The results demonstrate that the magnetic properties of the nanocomposite with NiO : SiO2 = 0.1 : 1 at low temperatures (T < 20 K) are determined by incomplete spin compensation in the matrix and on the surface of the NiO nanoparticles.
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Original Russian Text © N.B. Kondrashova, I.V. Val’tsifer, V.N. Strel’nikov, V.Ya. Mitrofanov, S.A. Uporov, 2016, published in Neorganicheskie Materialy, 2016, Vol. 52, No. 9, pp. 975–980.
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Kondrashova, N.B., Val’tsifer, I.V., Strel’nikov, V.N. et al. Preparation and magnetic characteristics of mesoporous nickel oxide–silica composites. Inorg Mater 52, 909–914 (2016). https://doi.org/10.1134/S0020168516090089
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DOI: https://doi.org/10.1134/S0020168516090089