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Microstructure and Optical Properties of Co x Zn 1– x Ga 2 O 4 (0 ≤ x ≤ 1) Nanoparticles
Author(s) -
Duan Xiulan,
Yu Fapeng,
Wu Yuanchun
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201004
Subject(s) - x ray photoelectron spectroscopy , annealing (glass) , crystallite , octahedron , chemistry , analytical chemistry (journal) , transmission electron microscopy , crystallography , nanoparticle , spectroscopy , absorption spectroscopy , ion , materials science , crystal structure , nanotechnology , nuclear magnetic resonance , metallurgy , physics , organic chemistry , chromatography , quantum mechanics
Co x Zn 1– x Ga 2 O 4 (0 ≤ x ≤ 1) nanoparticles were synthesized by the sol‐gel method and characterized by X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), 71 Ga solid‐state NMR spectroscopy, and UV/Vis spectroscopy. The results show that the Co x Zn 1– x Ga 2 O 4 nanoparticles were successfully obtained when the annealing temperature was 500 °C or above. The crystallite size of the as‐prepared particles was 20–55 nm, and increased with increasing annealing temperature and decreasing x value. Zn 2+ and Ga 3+ ions were located in both the tetrahedral and octahedral sites in Co x Zn 1– x Ga 2 O 4 nanoparticles, and the inversion parameter (two times the fraction of Ga 3+ ions in tetrahedral sites) decreased with increasing annealing temperature and increased with cobalt enrichment. The absorption spectra indicate that Co 2+ ions are located in the tetrahedral sites as well as in the octahedral sites in the nanoparticles. The fraction of octahedral Co 2+ ions decreased with increasing annealing temperature.