4 papers
Goldstone-mediated polar instability in hexagonal barium titanate
S. Simpson, U. Dey, R. J. Sjökvist +5
We discover a rare structural manifestation of the Goldstone paradigm in a hexagonal polytype of the archetypal ferroelectric BaTiO3. First-principles calculations confirm the Gold…
Superstructure reflexions in tilted perovskites part 2
Richard Beanland, Robin Sjokvist
In a previous article (Beanland & Sjokvist, 2024), we derived Boolean conditions for the appearance of superstructure reflexions in diffraction patterns from perovskites with tilte…
Superstructure reflexions in tilted perovskites Part 1
Richard Beanland, Robin Sjokvist
The superstructure spots that appear in diffraction patterns of tilted perovskites are well documented and easily calculated using crystallographic software. Here, by considering a…
Pyramidal charged domain walls in ferroelectric BiFeO
Pavel Marton, Marek Paściak, Mauro Gonçalves +4
Domain structures play a crucial role in the electric, mechanical and other properties of ferroelectric materials. In this study, we uncover the physical origins of the enigmatic z…