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Effect of citrate to nitrate ratio on the decomposition characteristics and phase formation of alumina

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Abstract

This paper reports the effect of the variation of citrate to nitrate ratio on the thermal decomposition characteristics of alumina precursor and the properties of nanocrystalline alumina synthesized using this auto-ignition process. The technique involves the auto-ignition of a citrate-nitrate gel occurring between Al(NO3)3 and citric acid to yield an ash powder that upon calcination at 1373 K produced α-alumina. The auto-ignition was restricted to a particular range of citrate to nitrate ratio in the gel. The resulting powder exhibited large surface area (40–50 m2 gm−1) and fine crystallite size. It was established from various characterization techniques that the alumina powder prepared with a C/N ratio of 0.3 has got the optimum powder characteristics compared to the rest of the batches, thus establishing the importance of maintaining a stoichiometric or near stoichiometric C/N ratio. The process has a higher degree of reproducibility and a good potential for large-scale production of alumina.

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Authors and Affiliations

  1. Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata, 700 032, India

    S. Banerjee & P. Sujatha Devi

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  1. S. Banerjee
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  2. P. Sujatha Devi
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Correspondence to P. Sujatha Devi.

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Banerjee, S., Sujatha Devi, P. Effect of citrate to nitrate ratio on the decomposition characteristics and phase formation of alumina. J Therm Anal Calorim 90, 699–706 (2007). https://doi.org/10.1007/s10973-007-8525-6

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  • DOI: https://doi.org/10.1007/s10973-007-8525-6

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