

Polycrystalline Cu2Se1-xSx (x = 0.2, 0.3, 0.5, and 0.7) samples were synthesized by a combination of melting and long-term high-temperature annealing. The temperature of the tubes was slowly (100 K h-1) raised to 1423 K and maintained at that temperature for 12 h, and then cooled down to 1073 K in 24 h. After annealing at 1073 K for 8 days, the tubes were furnace cooled to room temperature.
temperature of the tubes
raised
100 K h-1
K h-1
tubes
temperature
1423 K
K
tubes
maintained at that temperature
12 h
h
tubes
cooled down
1073 K
K
tubes
cooled down
24 h
h
tubes
annealing
1073 K
K
tubes
annealing
8 days
days