%0 Journal Article
%T On the effect of oxygen partial pressure on the chromium distribution coefficient in melt-grown ruby crystals
%A Steffen Ganschow
%A Detlef Klimm
%A Rainer Bertram
%J Physics
%D 2012
%I arXiv
%R 10.1016/j.jcrysgro.2011.04.033
%X Small ruby crystals were grown by the Czochralski technique in different atmospheres and their actual chromium content was analysed by a wet chemical method. The chromium distribution coefficient k was found to be strongly dependent on oxygen partial pressure p(O2). It ranges from k=0.3 in a reducing atmosphere to k=1.2 in a slightly oxidizing atmosphere and to a good approximation k depends linearly on log(p(O2)). The experimental data are discussed on the basis of thermodynamic equilibrium calculations.
%U http://arxiv.org/abs/1204.6225v1