The polymorphic transition pressure at high temperatures for potassium chloride observed by electrical resistance measurements.

The polymorphic transition pressure for potassium chloride, KCl, was determined with very high precision at high temperatures from 500°C to 900°C by using a high temperature cell in which NaCl was used as a pressure medium in a piston-cylinder apparatus. The transition pressure was obtained by observing sharp changes in electrical resistance through the transition.A linear transition line for KCl, P=19.22-0.00025T, was obtained.