Аннотация:X-ray diffraction and dielectric studies of the Pb6Sb2O11 phase are conducted using flux-grown singlecrystals. The crystal structure of the phase is determined for the first time, the role of the lead lone pair isclarified. In the studied temperature (80-940 K) and frequency (0.1-200 kHz) ranges, the temperaturefrequencydependences of the dielectric constant ε and the dielectric loss tangent tanδ show no featurescharacteristic of phase transitions.