Abstract: | Preparation and Electronmicroscopic Investigation of New Compounds Ln3MO4Cl5 (Ln = La? Nd; M = Ge, V) By heating mixtures of LnOCl, LnCl3 und GeO2 (2:1:1) in evacuated silica tubes (Pt-shells inside) the compounds Ln3GeO4Cl5 (Ln = La? Nd) were prepared. The case that the temperature of preparation (La: T = 900°C, 8d; Ce: T = 800°C, 9d; Pr, Nd: T = 650°C, 13 d) had to be reduced from Ln = La to Ln = Nd indicates a decreasing thermodynamic stability in this direction. The compound La3VO4Cl5 was prepared by heating (900°C, 8d) a mixture (2:1:1) of LaOCl, LaCl3 and VO2 and was investigated by electronmicroscopic techniques. |