The solid state phase transformation of potassium sulfate

Details The solid state phase transformation of potassium sulfate The solid state phase transformation of potassium sulfate

2008-01-14

arxiv.org/abs/0801.2077v1

Solid State Communications 141 (2007) 497-501

Physics

Condensed Matter

Materials Science

11 pages, 6 figures, 1 table

Scientific paper

10.1016/j.ssc.2006.12.008

Potassium sulfate single crystals that are grown from aqueous solutions lose upon the first heating up to 1% of mass that is assumed to be water. This mass loss occurs in the vicinity of the PT from orthorhombic to hexagonal K2SO4. Only in the first heating run of K2SO4 that has not yet released water, pretransitional thermal effects can be observed in the DTA curve. If K2SO4 crystals are grown from solutions containing 4 wt.% Cd, Cu, or Fe, only Cu or Fe can be incorporated significantly with concentrations of several 0.1%. The phase transformation temperature measured for such solid solutions depends on the heating rate. For pure K2SO4, the phase transformation temperature is independent on heating rate 581.3 deg. C and the enthalpy of transformation is (5.8+/-0.2) kJ/mol.

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