STRUCTURE SPACE CONVERSIONS IN K0,955Cs0,045NO3 SOLID SOLUTION CRYSTAL

Abstract

K0,955Cs0,045NO3 monocrystals have been achieved by the use of isothermal crystallization and polymorph conversions have been analyzed in the samples obtained with optical microscope and x-ray methods. It has been determined that K0,955Cs0,045NO3 crystal has an orthorhombic cage space group of which is Pmcn with a=5,4199Å, b=6,4363Å, c=9,1648Å, parameters at a room temperature. At T>455K temperature, this orthorhombic cage is converted into rhombohedral cage space group of which is m R 3 with a=5,4250Å, c=9,8360Å parameters. It has been clear that IIIII conversion in analyzed crystals occurs with the formation and growth of newly created crystal embryo within the main crystal. New modification embryo firstly grows in 100 crystallographic direction of the main crystal and after the growth ends in this direction, it continues in 001 crystallographic direction of the crystal. K0,955Cs0,045NO3 IIIII conversion is of monocrystal monocrystal type and is characterized as enantiotropic.