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1 Polish Journal of Chemistry

1 2006

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Investigation of the Tb2Se3-Cu2Se-PbSe and Dy2Se3-Cu2Se-PbSe Systems at 870 K

Gulay L., Wolcyrz M., Olekseyuk I.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

805-815

Isothermal sections of the Tb2Se3-Cu2Se-PbSe and Dy2Se3-Cu2Se-PbSe systems at 870 K were explored using X-ray powder diffraction. TbCuSe2 compound (LaCuS2 structure type, space group P21/c) and Tb(2+x)/3Cu2-xSe2 (0 _ x _ 0.85) solid solution (Er2/3Cu2S2 structure type, space group P3) were identified in the Tb2Se3-Cu2Se section and their crystal structures were determined. The existence of Dy(2+x)/3Cu2-xSe2 (0 _ x _1) solid solution (Er2/3Cu2S2 structure type, space group P3) was confirmed in the Dy2Se3-Cu2Se section and its structure was refined. Tb2+2xPb1-3xSe4 (0.07 _ x _ 0.19) solid solution (Th3P4 structure type, space group I43d) was identified and Dy6Pb2Se11 compound (Y6Pb2Se11 structure type, space group Cmcm) was observed in the R2Se3-PbSe section of the system with R = Tb or Dy, respectively. Crystal structure of Tb2+2xPb1-3xSe4 was refined. The existence of Tb3.33CuPb1.5Se7 (Lu3.33CuPb1.5Se7 structure type, space group Cm) and TbCuPbSe3 (beta-BaLaCuSe3 structure type, space groupPnma) compounds in the Tb2Se3-Cu2Se-PbSe system as well as of the isostructural Dy3.33CuPb1.5Se7 and DyCuPbSe3 compounds in the Dy2Se3-Cu2Se-PbSe system was confirmed