Local crystal chemistry, structured diffuse scattering and the dielectric properties of (Bi1−xYx)2(MIIINbV)O7 (M=Fe3+, In3+) Bi-pyrochlores

The pattern of correlated O′Bi4 tetrahedral rotation around the 〈111〉 axis responsible for the observed 〈111〉* rods of diffuse intensity in Bi-pyrochlores.