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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 1/2018

14-03-2018 | Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications

Correlation between oxygen vacancies and room-temperature ferromagnetism in Ti0.94Co0.03La0.03O2 nanoparticles influenced by different post annealing treatment

Authors: Hong Zhang, Meixiang Chen, Yuzhu Wang, Yibing Wu

Published in: Journal of Sol-Gel Science and Technology | Issue 1/2018

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Abstract

The correlation between oxygen vacancies and room-temperature ferromagnetism in Ti0.94Co0.03La0.03O2 nanoparticles is investigated by treating the samples in different post annealing process. Ti0.94Co0.03La0.03O2 nanoparticles were prepared via sol–gel method followed by post annealing under vacuum or in air. The samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL) spectroscopy, Raman spectra, and magnetic measurement techniques, respectively. The characterizations confirmed the incorporation of substituting Co and La atoms into anatase TiO2 lattice. More oxygen vacancies were introduced into Ti0.94Co0.03La0.03O2 when annealed under vacuum. The vacuum annealed sample exhibits typical ferromagnetic behavior with well-defined hysteresis loops and a saturation magnetization, while the air annealed sample displays feebler ferromagnetism, which is transformed to paramagnetism afterwards when further annealed in air. All measurements strongly support the decisive role of oxygen vacancies in inducing room-temperature ferromagnetism in Ti0.94Co0.03La0.03O2, which can be explained using the bound magnetic polaron model.
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Metadata
Title
Correlation between oxygen vacancies and room-temperature ferromagnetism in Ti0.94Co0.03La0.03O2 nanoparticles influenced by different post annealing treatment
Authors
Hong Zhang
Meixiang Chen
Yuzhu Wang
Yibing Wu
Publication date
14-03-2018
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 1/2018
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-018-4625-y

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