538dimensions of these and other rare-earth sodium molybdenum scheelites are reported elsewhere.6A few general remarks should be made concerning the optimum conditions for growing large crystals of oxides by the flux method:( a ) Use a large amount of material with the crucible filled with molten mass as near to the top as possible. The writers are, respectively, development ceramist, development metallurgist, and experimental operator for the Rocky Flats Division, The Dow Chemical Company, Golden, Colorado. Fig. 1. Specimens of CeO2 tlred at 1 8OO0C for 12 hours and etched with HF. (A) X 100, and ( 6 ) X500.
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