Temperature Lowering Method Research Articles

Solution growth of L(+) hydrazonium tartrate

Optically clear single crystals of L(+) hydrazonium tartrate, N 2H 4 · C 4H 6O 6, 2 cm on an edge were grown with difficulty from aqueous solution. Crystal growth is accomplished under an argon atmosphere using the temperature lowering method over the range 45 to 30°C. The argon inhibits the formation of oxidation decomposition products for up to 8 weeks at 40°C. The crystal morphology, relative growth velocities, relative supersaturation, and the effect of deuterium on the solubility are discussed.

Growth and characterization of Cs(D 1−x, H x) 2 AsO 4 from aqueous solutions

Highly deuterated single crystals of Cs(D 1−x, H x) 2 AsO 4 can be grown from D 2O by the temperature lowering method. The primary phase region, saturation and super-saturation concentrations of cesium dideuterium arsenate are reported. Typical deuteration levels in the crystal and the growth solution were determined. The transmission range, phase-match temperature and lattice constants of the most highly deuterated crystals were measured. Some of the difficulties associated with the aqueous growth of cesium dideuterium arsenate were eliminated by the adjustment of the solution P H to values ≥ 7.76 and by careful seed selection.