CoTiO{sub 3} via cobalt oxalate-TiO{sub 2} precursor. Synthesis and characterization
Purely trigonal ilmenite type powder; CoTiO{sub 3} was successfully synthesized through the thermal decomposition of CoC{sub 2}O{sub 4}{center_dot}2H{sub 2}O-TiO{sub 2} precursor. The decomposition course was followed using differential thermal analysis-thermogravimetry measurements and the intermediate decomposition products as well as the titanate product were characterized using X-ray diffraction, Fourier transform infrared, transmission electron microscopy techniques. Thermal analysis study indicated that, the intermediate decomposition product; Co{sub 3}O{sub 4} decomposed endothermically into CoO at 963 Degree-Sign C with instantaneous formation of CoTiO{sub 3}. X-ray diffraction of the powder calcined at 950 Degree-Sign C showed characteristic lines for Co{sub 2}TiO{sub 4} besides secondary phase of rutile-TiO{sub 2}, which are disappeared by rising the calcination temperature to 1000 Degree-Sign C. Transmission electron microscopy image of CoTiO{sub 3} powder exhibit weak agglomerated particles with heterogeneous morphology in both shape and dimensions. Type II adsorption isotherm estimated using Brunauer-Emmett-Teller procedure indicated a very high specific surface area of 29.7 m{sup 2} g{sup -1}. Electrical properties of CoTiO{sub 3} measured as a function of temperature and frequency showed a semiconducting behavior at high temperatures with conduction activation energy of 0.73 eV. Kinetic analysis of the non-isothermal thermogravimetry curves, using different computational methods, illustrated that the random nucleation and growth mechanisms are the predominant one. - Graphical Abstract: The figure showed the variation of dielectric constant ({epsilon} Prime ) for CoTiO{sub 3} with temperature at different frequencies. {epsilon} Prime appeared to be temperature and frequency independent at low temperatures. By increasing the temperature, the orientation polarization plays a significant role and a gradual increase of {epsilon} Prime occurred. Highlights: Black-Right-Pointing-Pointer CoTiO{sub 3} was synthesized through decomposition of CoC{sub 2}O{sub 4}{center_dot}2H{sub 2}O-TiO{sub 2} precursor. Black-Right-Pointing-Pointer XRD, FT-IR, TEM techniques are used to characterize decomposition course. Black-Right-Pointing-Pointer Specific surface area of 29.7 m{sup 2} g{sup -1} was obtained. Black-Right-Pointing-Pointer The prepared titanate showed semiconducting behavior.
- OSTI ID:
- 22163127
- Journal Information:
- Materials Characterization, Vol. 71, Issue Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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