Low-Temperature Synthesis of Highly Dispersed Calcium Aluminate

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Abstract

A new approach to prepare highly dispersed calcium aluminate at temperatures from 900°C with desired properties (bulk density starting from 0.015 g/cm3, particle size falling in the range of 7–42 described, which consists of step-by-step heat treatment of a concentrated aqueous solution of Al(NO3)3, Ca(NO3)2, and C6H8O7 in the molar ratio CaO : Al2O3 = 1 : 2. The main stages of the synthesis X-ray powder diffraction, IR spectroscopy, as well as scanning and transmission electron microscopies. dispersed calcium aluminate obtained using the developed approach has pronounced luminescent features.

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About the authors

L. O. Kozlova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Author for correspondence.
Email: kozzllova167@gmail.com
Russian Federation, Moscow

I. L. Voroshilov

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: kozzllova167@gmail.com
Russian Federation, Moscow

Yu. V. Ioni

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: kozzllova167@gmail.com
Russian Federation, Moscow

A. G. Son

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: kozzllova167@gmail.com
Russian Federation, Moscow

A. S. Popova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: kozzllova167@gmail.com
Russian Federation, Moscow

I. V. Kozerozhets

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: kozzllova167@gmail.com
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Scheme of synthesis of nanoscale CaAl2O4 powder

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3. Fig. 2. IR absorption spectra of samples obtained at different stages of heat treatment of carbon-containing xerogel based on Ca2+ and Al3+ nitrates at temperatures 130 (1), 300 (2), 400 (3), 500 (4), 900 (5), 1000 (6) and 1100°С (7)

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4. Fig. 3. Diffractograms of samples obtained after heat treatment of carbon-containing xerogel based on Ca2+ and Al3+ nitrates at temperatures 500 (1), 900 (2), 1000 (3), 1100 (4) and 1250°C (5)

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5. Fig. 4. SEM images of a sample obtained after heat treatment of carbon-containing gel Ca2+ and Al3+ at temperatures of 300 (a) and 500°C (b)

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6. Fig. 5. TEM (a) and SEM images (b) of a sample obtained after heat treatment of carbonaceous xerogel Ca2+ and Al3+ at a temperature of 900°C

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7. Fig. 6. TEM (a) and SEM images (b) of a sample obtained after heat treatment of carbonaceous xerogel Ca2+ and Al3+ at a temperature of 1000°C

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8. Fig. 7. Luminescence spectra of calcium aluminate samples at λexc = 238 (a) and 390 nm (b)

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