Abstract
The structural and polar nanoclusters have been found and studied out in model ferroelastics—mixed Hg 2 (Br,I) 2 crystals that were comprehensive investigated. The structural clusters are the nuclei of the low-temperature orthorhombic phase in the high-temperature tetragonal matrix, observed in a diffuse X-ray scattering at X-points of a Brillouin zone. They are related to phase transition and induced by fluctuations of an order parameter. The polar clusters, found out as quasi-local vibrations in a low temperature Raman-spectra, are due to disorder in an anionic sublattice and are induced by the polar mixed Br-Hg-Hg-I molecules and their proximate environment, which form ferroelectric and antiferroelectric nanoclusters.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call