This article is cited in 8 papers

Ultrafine $\alpha$-$\mathrm{Al}_2\mathrm{O}_3$. Explosive method of synthesis and properties

A. A. Bukaemskii, S. S. Avramenko, L. S. Tarasova

Physicotechnical Institute of the Krasnoyarsk State University, Krasnoyarsk, 660036

Abstract: An explosive method for producing ultrafine $\alpha$-$\mathrm{Al}_2\mathrm{O}_3$ is developed and optimal synthesis parameters are determined. Particles of ultrafine $\alpha$-$\mathrm{Al}_2\mathrm{O}_3$ have a spherical shape and are separated from one another. The size distribution is log-normal (number-averaged size 70 nm and variance 1.9). Special features of phase transitions in ultrafine aluminum oxide under shock-wave action are studied. Results of x-ray phase analysis suggest stabilization of the new high-pressure phase $\delta'$-$\mathrm{Al}_2\mathrm{O}_3$ with a face-centered cubic lattice with a parameter $a=8,53\mathring{\mathrm{A}}$.

Keywords: metastability, corundum, shock-wave synthesis, surface, modification.

UDC: 621.762.21+539.89+538.91

Received: 13.10.2000
Accepted: 31.08.2001

 English version: Combustion, Explosion and Shock Waves, 2002, 38:4, 478–483

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