期刊
CERAMICS INTERNATIONAL
卷 44, 期 14, 页码 16352-16364出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.06.043
关键词
Iron oxide nanoneedles; Sol-gel; Vacancy ordered and disordered iron oxide phases
Having extensive knowledge of room temperature and temperature dependent dielectric and impedance properties of iron oxide nanostructures will help in extending the field of application from biomedical sciences to microelectronics industry. This aspect of iron oxide has long been neglected and the attention is mostly focused on magnetic investigations. To explore and extend the field of application of iron oxide this study is focused on detailed investigation of structural as well as temperature dependent (30-210 degrees C) dielectric along with impedance analysis. Iron oxide nanostructures are prepared using template free oleic acid assisted sol-gel method with variation in molarity of the finally synthesized sol in the range of 0.2-2.0 mM (interval 0.2 mM). Magnetite (Fe3O4) phase is observed at molarity of 0.2 mM whereas, vacancy ordered and disordered maghemite (gamma-Fe2O3) phases are observed at molarities of 0.8-1.0 mM and 1.4-2.0 mM, respectively. Dielectric constant of 104.6, 74.5 and 98.43 (log f = 5.0) is observed at molarities of 0.2 mM, 1.0 mM and 2.0 mM for Fe2O3 and vacancy ordered (V-o) & disordered (V-d) gamma-Fe2O3 phase, respectively. Zview software is used for the fitting of Nyquist plots. Fitted data reveals that dielectric constant strongly depends on grain boundary resistance (R-gb). Activation energy of 0.25 eV and 0.296 eV (log f = 5) is observed for Fe2O3 and V-d gamma-Fe2O3 phase at 0.2 mM and 2.0 mM molarity of the final iron oxide sol.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据