Premium
The complexity of structural phase transitions in Pb(Hf 0.92 Sn 0.08 )O 3 single crystals
Author(s) -
JankowskaSumara Irena,
Ko JaeHyeon,
Majchrowski Andrzej
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17967
Subject(s) - antiferroelectricity , raman spectroscopy , single crystal , raman scattering , atmospheric temperature range , phase transition , phase (matter) , crystallography , materials science , diffraction , phonon , octahedron , scattering , dielectric , soft modes , condensed matter physics , crystal structure , ferroelectricity , chemistry , optics , physics , thermodynamics , organic chemistry , optoelectronics
Pb(Hf 1− x Sn x )O 3 single crystals with x = 0.08 were characterized using single‐crystal X‐ray diffraction and Raman scattering, in a wide temperature range. The information concerning the structure of two intermediate phases (IMs), situated between low‐temperature antiferroelectric A1 and high‐temperature paraelectric PE phases, was obtained. The lower temperature IM, A2, is characterized by incommensurate displacive modulations in the Pb sublattice. The higher temperature IM, is characterized by tilting of oxygen octahedra, and serious disorder coming from lead ions represented by X‐ray diffuse scattering. Optical phonons and phase transitions in Pb(Hf 1− x Sn x )O 3 single crystals were investigated by temperature‐dependent Raman spectra. It was found that several soft modes control the phase transition between two antiferroelectric phases indicating its displacive character, whereas, in the paraelectric phase, both soft modes and Rayleigh scattering were observed.