Journal Article 2D materials BZT–xBCT Research Support, Non-U.S. Gov't X-ray diffraction applied electric fields band alignment barium titanate coexisting phases complex functional materials dielectric energy‐storage ceramics dual‐phase structure electro-ceramics ferroelectrics grain sizes heterostructures high-energy diffraction high-resolution detectors holey nanosheets in situ metal-based coordination polymers microstructures multi-analyser detectors neutron diffraction perovskite piezoelectrics powder X-ray diffraction relaxor ferroelectrics strain strain mechanisms