DETERMINATION OF THE CRYSTAL STRUCTURE OF ERBIUM TITANATE, Er₂Ti₂O₇, BY X-RAY AND NEUTRON DIFFRACTION

Abstract

The crystal structure of erbium titanate, ErzTizO?, has been shown by X-ray and neutron powder diffraction to be of the cubic pyrochlore type, with a , = 10.0762 f 6 A. Least-squares isotropic refinement based on resolved single reflections gave x(O2) = 0.4200 f 10 and R = 2.25%. Ionic and neutral X-ray scattering factors gave practically identical results. T h e six equal Ti-02 distances in the distorted coordination octahedron of the T i atom are 1.955 f 5 A.

Synthesis, Magnetic Properties, Magnetic Entropy and Arrot Plot of Antiferromagnetic Frustrated Er2Ti2O7 Compound

“…The quality of the refinement was evaluated through the goodness of fit indicator χ 2 . The structural parameters values, determined from the refinement and illustrated in Table 1, are in good agreement with those reported in literature [20].…”

Preparation and high temperature-XRD studies on a pyrochlore series with the general composition Gd2−xNdxZr2O7

“…The space group of the ideal pyrochlore is Fd3m [1]. The pyrochlore structure is reported [2][3][4][5] as a network consisting of corner linked of BO 6 octahedra with A atoms filling the interstices. Pyrochlores are interesting materials both from the point of view of fundamental as well as technological applications.…”

Frustration under pressure: Exotic magnetism in new pyrochlore oxides

“…18 It is fortunate that this compound was chosen as it is a chemically well-ordered example within the rare earth series. The space group Fd-3m was established as the proper cubic symmetry.…”