Premium
Disorder‐Induced Phonon Localization in Incipient Ferroelectric (Ni 1/3 Nb 2/3 ) x Ti 1− x O 2 Solid Solutions
Author(s) -
Wang Jian,
Gao Dandan,
Xie Jiyang,
Jiang Xiao-Ming,
Hu Wanbiao
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000043
Subject(s) - raman spectroscopy , phonon , dielectric , materials science , ferroelectricity , rutile , analytical chemistry (journal) , fourier transform infrared spectroscopy , soft modes , condensed matter physics , nuclear magnetic resonance , physics , chemistry , optics , optoelectronics , organic chemistry , chromatography
The phonon behavior in incipient ferroelectric (Ni 1/3 Nb 2/3 ) x Ti 1− x O 2 ceramic solid solutions is investigated with combined Raman, Fourier transformed infrared (FTIR), and dielectric spectroscopy. The (Ni+Nb) incorporation into rutile TiO 2 leads to the Raman and infrared modes broadening, the Gaussian‐type Raman peak of A 2 u (LO) mode, and the dielectric constant (at 14 K) of different compositions being proportional to the mole ratio of Ti cations. It suggests that, with increasing (Ni + Nb)‐substitution, the cationic disorder gradually develops and the disorder‐induced phonon localization occurs. In particular, the soft A 2 u mode appears to be localized to Ti‐containing regions. This work demonstrates that the combined Raman, FTIR, and dielectric analysis can effectively probe the cationic disorder and phonon localization behaviors in incipient ferroelectric (Ni 1/3 Nb 2/3 ) x Ti 1− x O 2 and provides an experimental evidence of phonon localization in 3D disordered systems with mass and spring constant disorder, which enriches the understanding of the Anderson localization in vibrational systems.