1. Materials Science and Technology Division, U.S. Naval Research Laboratory, Washington, DC 20375, USA
2. Acoustics Division, U.S. Naval Research Laboratory, Washington, DC 20375, USA
3. Department of Physics and Astronomy, University of Missouri–Kansas City, Kansas City, Missouri 64110, USA
4. Department of Physics, Rowan University, Glassboro, New Jersey 08028, USA
5. Naval Undersea Warfare Center (NUWC), Newport, Rhode Island 02841, USA
6. Group for Ferroelectrics and Functional Oxides, Department of Materials Science, Swiss Federal Institute of Technology-EPFL, EPFL-SCI-STI-DD, Bât. MX D236, Station 12, CH-1015 Lausanne, Switzerland
7. Electrosciences Ltd., Farnham, Surrey GU9 9QT, United Kingdom
8. XMaS Beamline, European Synchrotron Radiation Facility, Grenoble F-38043, France
9. Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool L69 7ZE, United Kingdom