Structure D 2000Crystal Structures of RPt3-xSi1-y (R: Y, Tb, Dy, Ho, Er, Tm, Yb) Studied by Single Crystal X-Ray Diffraction. -The crystal structures of YPt 2.82 Si 0.85 , TbPt 2.82 Si 0.85 , space group P4/mbm. The structures can be considered as a packing of four types of building blocks which derive from the CePt3B-type unit cell by various degrees of distortion and Pt, Si-defects. -(GRIBANOV, A.; GRYTSIV, A.; ROGL*, P.; SEROPEGIN, Y.; GIESTER, G.; J. Solid State