Reliability of radio frequency dielectric experiments in perovskites

Several radio frequency experiments with perovskites are reviewed. The devices used by several groups were very different, and the chemical nature and shape of the perovskite samples were intentionally changed. Despite this, sub-gigahertz relaxation is always reported. We describe and overcome all the possible extrinsic contributions to this relaxation, and we conclude that it is related to the perovskite structure.