Structural characterization of Kalsilite

Abstract

Thermally induced phase transformation of K-exchange LTA zeolite is followed in the range from room temperature to 1500 ºC. The frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100 °C results directly in formation a kalsilite [a= 8.1095 (4) Å, b =12.824 (4) Å, c =7.0674 (4) Å, β =115.89 °(3)]. The crystale phases of kalsilite in temperature range between 700 and 1500°C was investigated by X-ray powder analyses.