Ion-Irradiation-Induced Amorphization of Cadmium Niobate Pyrochlore

摘要

Pyrochlores represent a large class of compounds with the general chemicalformula A(sub 2)B(sub 2)O(sub 7). The pyrochlore structure consists of interconnected AO(sub 8) and BO(sub 6) cation polyhedra where the BO(sub 6) octahedra are slightly distorted and form a continuous corner-sharing network. The large, 8-fold coordinated A-site cations and the seventh oxygen occupy channels in the (B(sub 2)O(sub 6)) network of octahedra. The structure is an anion-deficient MX(sub 2) flourite structure in which the A and B cations are ordered onthe M sites. One eigth of the X anions are absent in the pyrochlore structure, and the resulting oxygen vacancies are ordered on the anion sublattice.