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Cobalt Alumino Silicate Ceramic(CASC) nanocomposite, a material with moderately high dielectric constant and low tangent loss at a critical concentration in high frequency range.
1 , 2 , 1 , 3 , * 1
1  Department of Physics, Jadavpur University. Kolkata-700 032, India.
2  Jagadis Bose National Science Talent Search, Kolkata – 700 107, India.
3  Center for Interdisciplinary Research and Education, Jodhpur Park, Kolkata-700068


Cobalt Alumino Silicate Ceramic (CASC) composites, with different molar weight concentration (i.e. G0=0, G1=0.4, G2=0.6, G3=0.8, G4=1.0, and G5=1.2 (M.W.)) of cobaltus acetate are prepared via sol-gel route. XRD shows mullite and cobalt aluminate phase which is found to depend on the concentrations of Co+2 ions. Field emission scanning electron microscope (FESEM) images show for all samples of CASC nanocomposites after sintering at 1400oC, nano sized cobalt aluminate grains are embedded in evenly spread mullite grains; but in case of G0, there are only evenly spread mullite grains. The study of dielectric property of the composite samples at room temperature shows that at all concentration (G1, G2, G3, G4 and G5) the dielectric constant is higher than pure mullite (G0) and there is a critical concentration of cobaltus acetate (G3) where there is maximum enhancement of dielectric constant in the higher frequency range from 40 KHz to 2 MHz. The dielectric constant varies from 44.77 to 37.75 for G3 and from 29.8 to 24.12 for G0 respectively. The tangent loss of composite with G3 has the lowest value than that of other concentrations including pure mullite in the frequency range 40 KHz to 2MHz. Due to high dielectric constant and low tangent loss, the composite with specific concentration and in the high frequency range has great importance as an electronic material.

Keywords: Mullite; dielectric constant; tangent loss; electronic material; sensor; capacitor.
Comments on this paper
Humbert G. Díaz
Are there public databases of CASC and other nanocomposites?
Dear authors

This is a very interesting field of research indeed!
Do you know some computational methods useful to predict properties of CASC and other nanocomposites?
In the same line. Do you know some public databases with large collections of CASC and other nanocomposites, including components, composition, physicochemical properties, toxicity, etc.?

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