in melt
CoO (1mol) and Cr2O3 (1mol) heated in the fluxing agent KCl to 1000-1500°C;; excessive CoO extracted from the powdered compound with concd. HCl or HNO3;;
参考文献
Bostroem; Lindblom; Rosen; Soederlund
High temperature science, 1988 , vol. 28, p. 235 - 244