NDLI: Physicochemical Properties of Spray-Deposited CoFe$_{2}$O$

Content Provider	Springer Nature Link
Author	Bagade, A. A. Ganbavle, V. V. Rajpure, K. Y.
Copyright Year	2014
Abstract	Cobalt ferrite thin films are deposited onto quartz glass substrates by chemical spray pyrolysis technique at different substrate temperatures using ferric nitrate and cobalt nitrate as precursors. Thermogravimetric analysis (TGA) study indicates the formation of CoFe$_{2}$O$_{4}$ by decomposition of cobalt and ferric nitrates after 800 °C. X-ray diffraction studies reveal that annealed films are polycrystalline in nature and exhibit spinel cubic crystal structure. Crystallite size varies from 39 to 44 nm with the substrate temperatures. Direct optical band gap energy of CoFe$_{2}$O$_{4}$ thin films is found to be 2.57 eV. The AFM images show that roughness and grain size of the CoFe$_{2}$O$_{4}$ thin film are about 9 and 138 nm, respectively. The measured DC resistivity of the deposited thin films indicates that as temperature increases the resistivity decreases indicating the semiconductor nature of the films. Decrease in dielectric constant (ε′) and loss tangent (tanδ) has been observed with frequency and attains the constant value at higher frequencies. The AC conductivity of cobalt ferrite thin films increases with increase in frequency. Thus, the prepared films show normal dielectric performance of the spinel ferrite thin film. Room-temperature complex impedance spectra show the incomplete semicircles as films exhibit high resistance values at lower frequencies.
Starting Page	2787
Ending Page	2794
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	8
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2014-05-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AFM CoFe$_{2}$O$_{4}$ thin films dielectric properties spray pyrolysis temperature Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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