NDLI: Dielectric and Structural Properties of Bi$_{5}$Ti$_{3}$FeO$_{15}$ Ceramics Obtained by Solid-State Reaction Process from Mechanically Activated Precursors

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Dielectric and Structural Properties of Bi$_{5}$Ti$_{3}$FeO$_{15}$ Ceramics Obtained by Solid-State Reaction Process from Mechanically Activated Precursors

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Dielectric and Structural Properties of Bi$_{5}$Ti$_{3}$FeO$_{15}$ Ceramics Obtained by Solid-State Reaction Process from Mechanically Activated Precursors

Content Provider	Springer Nature Link
Author	Dercz, J. Starczewska, A. Dercz, G.
Copyright Year	2011
Abstract	Bi$_{5}$Ti$_{3}$FeO$_{15}$ (BTFO), an Aurivillius compound, was synthesized via sintering the Bi$_{2}$O$_{3}$ and Fe$_{2}$O$_{3}$ mixture and TiO$_{2}$ oxides. The precursor material was ground in a high-energy attritorial mill for (1, 3, 5, and 10) h. The orthorhombic system Bi$_{5}$Ti$_{3}$FeO$_{15}$ ceramics was obtained by a solid-state reaction process at 1313 K. Phase formation behavior was investigated using differential thermal analysis (DTA), thermal gravimetric (TG), and X-ray diffraction (XRD) techniques. The frequency-dependent properties of the material were investigated by impedance spectroscopy. The impedance spectroscopic method is widely used to characterize electrical properties of materials and their interfaces with electronically conducting electrodes. These studies indicate that 1h, 3h, and 5h primary high-energy ball milling followed by sintering is a promising technique for pure Bi$_{5}$Ti$_{3}$FeO$_{15}$ ceramic preparation, whereas the ceramics obtained from the substrates after 10h milling is a two-phase material. As the result of this investigation, the model of adjusting the Nyquist charts with a three-element R-CPE (constant phase element) series connection was proposed. It was found that the value of the dielectric constant at the Curie temperature decreases when the milling time of the substrates increases. The decrease in the dielectric constant is influenced by the great dispersion of the grains, their dense packing, and location of particular grains in relation to other grains. Moreover, the change of resistivity with frequency indicates that relaxation processes take place in the material. In conclusion, it was reported that the optimal milling time of precursor oxide powders for carrying out the sintering process is equal to 5 h. Then the obtained ceramics contain one phase and exhibit the highest dielectric properties for practical applications.
Starting Page	746
Ending Page	761
Page Count	16
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	4
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-04-02
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aurivillius phase Bi$_{5}$Ti$_{3}$FeO$_{15}$ Dielectric properties Ferroelectrics High-energy ball milling Microstructure Multiferroics Physical Chemistry Mechanics Industrial Chemistry/Chemical Engineering Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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