Comparison of the force field in various pyrochlore families. I. The A2B2O7 oxides

A complete vibrational study of various pyrochlore compounds A2B2O7 shows the role of the different chemical bonds in the structure and how the physico-chemical characteristics of the A and B cations influence these bonds and the rigidity of the two lattices of the structure. Relations between vibrational spectra and structural features are established.