Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15

DOI: 10.1038/s43246-024-00508-1

Authors: Jeremiah P. Tidey (University of Warwick) , Urmimala Dey (Durham University) , Ana M. Sanchez (University of Warwick) , Wei-Tin Chen (National Taiwan University; Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council) , Bo-Hao Chen (National Synchrotron Radiation Research Center (Taiwan)) , Yu-Chun Chuang (National Synchrotron Radiation Research Center (Taiwan)) , Maria T. Fernandez-Diaz (Institut Laue-Langevin) , Nicholas C. Bristowe (Durham University) , Richard Beanland (University of Warwick) , Mark S. Senn (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Communications Materials , VOL 5

State: Published (Approved)
Published: May 2024
Diamond Proposal Number(s): 25166

Abstract: The tetragonal tungsten bronze, Sr2NaNb5O15, shows promise for application in high-temperature high-efficiency capacitors vital for the sustainable energy revolution. Previously, the structural complexity of this and related materials has obscured the mechanisms underpinning two large anomalies in relative permittivity (εr) which give rise to their exceptionally broad dielectric response. Here, we comprehensively investigate the structural evolution from −173 to 627 °C, combining electron, X-ray and neutron diffraction, electron microscopy, and first principles electronic structure calculations to unambiguously identify the structural origins of both anomalies. The peak in εr at 305 °C is associated with a polar-nonpolar phase transition, wherein cations displace along the c axis. Guided by DFT, we identify a further transition upon cooling, associated with the second peak at −14 °C, linked to the softening of an in-plane polar distortion with a correlation length limited by ferroelastic nano-domains arising from rigid-unit-like tilting of NbO6 octahedra at high temperature, imparting relaxor-like behaviour. Thus, the two dielectric anomalies in Sr2NaNb5O15 are associated with two distinct crystallographic phase transitions and their interplay with a microstructure that arises from a third, non-polar structural distortion. Chemical control of these will enable development of tuneable materials with dielectric properties suitable for high-temperature energy storage applications.

Subject Areas: Materials, Chemistry, Energy


Instruments: I11-High Resolution Powder Diffraction

Other Facilities: 19 A at Taiwan Photon Source; D2B at ILL

Added On: 15/05/2024 11:36

Documents:
s43246-024-00508-1.pdf

Discipline Tags:

Energy Storage Hard condensed matter - electronic properties Energy Physics Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction