A working model for burnout of additives is presented for the flame fusion growth of crystals (Verneuil process). The case of α—Al2O3:Cr3+ (ruby) is of special interest since the additive (chromium) manifests more than one valence state in the powder, the conventional form of the feed material.
REFERENCES
1.
2.
An extensive discussion on the engineering aspects of the technology applied to sapphire and ruby is given in an article by S. K. Popov, in Growth of Crystals, A. V. Shubnikov and N. N. Sheftal, Eds., (Consultants Bureau Enterprises, Inc., New York, 1959), Vol. 2, p. 103.
3.
R. C.
Pastor
, H.
Kimura
, L.
Podoksik
, and M. A.
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43
, 3948
(1965
). In the following discussion, this will be referred to as Part I.4.
R. C.
Pastor
, A. C.
Pastor
, H.
Kimura
, and K.
Arita
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44
, 4486
(1966
). In the following discussion, this will be referred to as Part II.5.
K. Arita and H. Kimura, oxyhydrogen Verneuil growth of mixed crystals (low‐level doping) in corundum (unpublished).
6.
See Fig. 5 of Part II for both oxyhydrogen and oxygas burners.
7.
8.
9.
The curve described by Eq. (13) is easily rectified by plotting against w. The slope and the intercept yield and to
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© 1966 American Institute of Physics.
1966
American Institute of Physics
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