Synthesis and characterization of NaAlSi_2O_6 jadeite under high pressure and high temperature

摘要

With Al_2(SiO_3)_3 and Na_2SiO_3 · 9H_2O as raw materials, the NaAlSi_2O_6 jadeite was synthesized in the temperature range of 1000–1600?C under 5.0 GPa conditions. Amorphous glass materials are entirely converted to crystalline NaAlSi_2O_6 jadeite at 5.0 GPa and 1450?C. All the experimental results reveal that the properties of synthetic NaAlSi_2O_6 resemble the natural jadeite very much. The research indicates that we provide a new approach to synthesize NaAlSi_2O_6 and offer an essential guideline for jewelry, which will be helpful for deep understanding on the origin of natural jadeite and the metamorphism of magma within the Earth.