Zur Kenntnis von EuBeGd2O5 mit einem Beitrag über Phasen der Zusammensetzung M1-xM′xBeLn2O5: Ca0,4Sr0,6BeSm2O5, Ba0,25Ca0,75BeNd2O5 und Ba0,36Sr0,64BeNd2O5 / On EuBeGd2O5 and on Phases of the Composition M1-xM′xBeLn2O5: Ca0,4Sr0,6BeSm2O5, Ba0,25Ca0,75BeNd

Abstract Single crystals of (I): EuBeGd2O5, (II): Ca0,4Sr0,6BeSm2O5, (III): Ba0,25Ca0,75BeNd2O5 and (IV): Ba0.36Sr0.64BeNd2O5 were prepared by (I): plasma torch and (II)-(IV ): CO2-LASER technique. X-Rayo investigations lead to (I) monoclinic (space group C5 2h-P21/c, a = 7.126, b = 6.457, c = 9.394 Å , β = 90.40°) and (II)-(IV) orthorhombic symmetry (D16 2h-Pnma). (II: a = 9.454, b = 7.142, c = 6.490 Å; III: a = 9.508, b = 7.188, c = 6.531 Å; IV: a = 9.642, b = 7.295, c = 6.614 Å). In contrary to the phases M1-xM′xBeLn2O5, EuBeGd2O5 is characterized by an ordered distribution of Eu2+ and Gd3+ inside of the Kagomé network.