Abstract
We report the room temperature magnetic behavior of pure and dual shells ZnO as well as SiO2 coated ZrO2 core–shell nanoparticles. All the samples, viz., ZrO2, ZrO2/ZnO and ZrO2/ZnO/SiO2 nanocrystallites have been successfully synthesized by chemical precipitation method. The XRD studies confirm the tetragonal structure for pure Zirconia and hexagonal wurtzite structure for ZnO coated ZrO2 samples. Average size of nanocrystallites has been observed to increase due to the incorporation of the shells over ZrO2. Studies of SEM, TEM and EDAX were used to determine the morphology, size and presence of elements in the ZrO2 nanocrystallites. The existence of SiO2 on ZrO2@ZnO was characterized by FT-IR measurement. The VSM studies have shown that the dual shells ZnO as well as SiO2 coated ZrO2 samples exhibit S-shaped paramagnetic behavior of the samples with little variations. The paramagnetic ordering of this core–shell nanostructure was mainly attributed to oxygen vacancies and also to the minor impurity phases in Zirconia and ZnO lattices.
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Selvi, N., Sankar, S. & Dinakaran, K. Interfacial effect: magnetism in pure ZrO2, ZnO and SiO2 coated core/shell/shell hybrid nanoparticles. J Mater Sci: Mater Electron 26, 273–279 (2015). https://doi.org/10.1007/s10854-014-2395-z
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DOI: https://doi.org/10.1007/s10854-014-2395-z