الفهرس 
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Abstract
Various stoichiometric ratio single crystals of sodium potassium sulphate are grpwm by dymamical and isothermal evaporation method from aqueous solution The effect of stoichiometric ratio on the phase transition temperature, Tc = 453 K, has been studied in the temperature range 300 up to 500 K. This study is carried out using electrical and thermal measurements. The effect of uniaxial pressure on the transition temperature Tc is also examined.