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M. N. Danchevskaya, Yu. D. Ivakin, O. G. Ovchinnikova

Features of Physico-chemical Properties of Corundum Doped by Chrome under Supercritical Conditions

Abstract

The mechanical and optical properties of fine-crystalline corundum doped by chrome in a supercritical water fluid at 400 – 410°C (Pí2o= 26-29 MPa) are investigated. It was established, that the introduction of chrome in structure of corundum during its synthesis changes the size, habitus and properties of crystals. At the content of chrome in corundum in the field of 0.1 mas. % the optimization of its properties is observed: the size of crystals is incremented, their hardness will increase, the intensity of a red luminescence amplifies. At major concentrations of chrome the performance of corundum are worsened. The low-temperature doping of corundum during its synthesis allows to gain well edged crystals by the size up to 500 microns with chrome, uniformly distributed on volume, with the high mechanical and optical performances.
Moscow University Chemistry Bulletin.
2003, Vol. 44, No. 5, P. 287
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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