Crystallographic studies of BaR_2ZnO_5(R=La, Nd, Dy, Ho, Er, and Y)

摘要

The crystal structures of BaR_2ZnO_5, where R=La, Nd, Dy, Ho, and Y, were studied by neutron diffraction, and that of the Er analog was investigated by synchrotron X-ray diffraction. Two structure types were confirmed for this series of compounds and agreed with those reported in literature. The compounds with a smaller size of R(R=Dy, Ho, Y, and Er) are isostructural tot he orthorhombic "green phase (BaY_2CuO_5)" compounds. The cell parameters for compounds with the R=Er to Dy range form a=7.0472(1) A to 7.0944 (1) A, b=12.3022 (1) a to 12.3885(2)A, and c=5.6958(1) A to 5.7314(1) A, respectively.