GROWTH OF CAKPO4 CRYSTALS FROM A K2MOO4 F LUX

Colorless and transparent crystals of CaKPO4 were grown for the first time from a K2MoO4 flux by a slow cooling method. Flux growth of CaKPO 4 crystals was conducted by heating mixtures containing 2 to 20 mol% s olute at 1100 degrees C for 10 h, followed by cooling to 500 degrees C at a rate of 5 degrees C h(-1). CaKPO4 crystals of sizes up to 0.5 mm x 0.5 mm x 0.1 mm were grown. The crystal sizes were dependent on the solute content. The most suitable content was 4 mol%. The shape of th e crystals was a hexagonal thin plate. On the basis of X-ray diffracti on and differential thermal analysis studies, it was shown that the gr own crystals could exist in two polymorphic forms. The stable form at room temperature transformed into high-temperature form (hexagonal) at about 660 degrees C. The most developed crystal faces of the high-tem perature form had an index of {0001}.