in neat (no solvent) reaction for 30 to 35 h in sealed tube (Mo or pyrex glass) at 450 to 500°C, ampuls are heated in autoclave filled with N2 or CO2 at 20 atue;;
参考文献
Zhurnal Neorganicheskoi Khimii, , vol. 5, p. 923 - 924
Zhurnal Neorganicheskoi Khimii, , vol. 5, p. 1900 - 1901