Studies on the structure phase transition and microstructure of ZnS:Cu and ZnS:Mn by X-ray powder diffraction analysis (XPDA)

electron spin resonance (ESR) and high resolution electron microscopy (HREM)show that: (A) the phase transition temperature of ZnS is shifted obviously to higher value when the concentration of Cu is greater than 1×10

-3

or to lower value when the concentration of Mn is greater than 1×10

-3

;(B)for ZnS:Cu 2×10

-3

(calcined at 900℃)

there mainly exist 180° rotation twins of

β

-phase; (C) for ZnS:Mn 5×10

-3

(calcined at 900℃)there mainly exists the coherent growth of

β

-phase (180° rotation twins) and

α

-phase at micro-area in atomic scale; and (D) twin boundary areas and crystal streaks are rich in Cu.