Structural Origins of Dielectric Phenomena in Promising Sr-Na-Nb-based TTB Ferrorelaxors
In the drive to obtain commercially viable materials for use in high-temperature, high-efficiency Class-II capacitors, necessary for the global energy transition, we have developed a promising line of tetragonal tungsten bronze (TTB) ferrorelaxors: Sr2¿2zCazYzNaNb5¿zZrzO15 (z=0-0.05). However, anomalous features in temperature scans of their dielectric properties preclude their commercialisation. With structure-property relationships of TTBs in their infancy, we have identified the potential origins of these anomalies through combined X-ray, electron and DFT studies. To develop a comprehensive theory of the structure-property interplay in these systems, we now require neutron diffraction data to elucidate: (a) the precise oxygen atom positions to describe the nature and evolution of tilts and rotations in the network of NbO6 octahedra, and (b) the existence of a predicted lower-symmetry monoclinic phase. We propose a 4-day experiment using both cryostream and furnace to collect at 8 temperatures for 3 samples between 10 and 725 K. Results will significantly further understanding of this emerging class of functional materials, providing design routes to viable capacitor materials.
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Mark S Senn; FERNANDEZ DIAZ Maria Teresa; LADBROOK Evangeline; SIMPSON Struan; Jeremiah P. Tidey and TRAGHEIM Ben. (2023). Structural Origins of Dielectric Phenomena in Promising Sr-Na-Nb-based TTB Ferrorelaxors. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-783
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