In:
Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 40, No. 3 ( 1991), p. 490-
Abstract:
The structures of a family of pure ZnS and ZnS eloped by activator Cu and Mn with different concentration ranges under sintering temperature ranging from 600℃ to 1200℃ have been investigated by x-ray powder diffraction method. Using the absolute standard method, the weight ratio of a phase to 3 phase of ZnS microcrystal and the constant Kβα of this method have been determined. The results show that the transition temperature of low temperature βphase to high temperature α phase is 1020℃ for pure ZnS, as generally accepted. When the concentration of doped Cu is in excess of 1×10-3, the phase trasition temperature (PTT) moves obviously to high temperature. As the concentration of Cu reaches 2×10-3, the PTT is higher than 1200℃. The results can be explained by postulating when the concentration of Cu is greater than the solubility of Cu in ZnS, a separate phase of copper sulfide serves as a nucleating phase for the growth of cubic ZnS and thus promotes the hexagonal-to-cubic transition. When the concentration of doped Mn is in excess of 1×10-3, the PTT moves obviously to low temperature. As the concentration of Mn reaches 5×13-3, the PTT is lowered to 730℃. In the range from 700℃ to 950℃, the weights of α phase and βphase are close to each other. The PTT of ZnS: Cu 2×10-3. Mn 5×10-3 are also determined approximately as 1100℃.
Type of Medium:
Online Resource
ISSN:
1000-3290
,
1000-3290
Language:
Unknown
Publisher:
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Publication Date:
1991
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