1. J. W. Nielsen and E. F. Dearborn, J. Phys. Chem. Solids 4, 202 (1958).
2. J. W. Nielsen, J. Appl. Phys. 31, 51S (1960).
3. “Congruently saturating” is used in this work in the sense denned by Findlay. See, for example, The Phase Rule by A. Findlay, A. N. Campbell, and N. O. Smith (Dover Publications, New York, 1951), p. 346.
4. C. E. Miller, J. Appl. Phys. 29, 233 (1958).
5. V. A. Timofeeva and A. V. Zalesskii, Rost Kristallov, edited by A. V. Shubnikov and N. N. Sheftal (U. S. S. R. Academy of Sciences Press, Moscow, 1959), Vol. 2, p. 88; Crystal Growth, (translated by Consultants Bureau, New York, 1959), Vol. 2, p. 69.