Effect of Pressure and Temperature on Lattice Parameters of Nepheline

Abstract

An experimental investigation was made involving the synthesis of nepheline (NaAlSiO4) under varying conditions of temperature and water pressure 2022-2130 for each synthesized charge was obtained using x-ray diffraction methods. It was found that the results of the individual runs provided an erratic lattice parameter variation with temperature in the range 500 to 800 degrees Celsius. However, a least squares curve indicates that no change in lattice parameters in the low-nepheline polymorph occurs with temperature of formation, for 95 percent probability.