Abstract
A beryllium pressure vessel mounted in an X-ray goniometer and modified for heating to 300°C has permitted the direct recording of transition rates across all of the equilibrium boundaries of the KNO 3 phase diagram. Most transitions show rate curves that taper off near the completion of the process, but metastable persistance of phase III occurs in the phase II field and becomes greater at high pressures and low temperatures along the negative II–III phase boundary. Several diffraction patterns of the transitions I–II and III–II revealed preferred orientation of grains in the resulting aragonite-type phase. Cell parameters of KNO 3-I and KNO 3-III (both modified calcite-type structures) taken in their stability fields show a marked reduction in the c-axis length going from phase I to phase III with increasing pressure at constant temperature.
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