Open AccessTunable giant negative thermal expansion in Ti2O3-based polycrystalline materials
Author(s) -
A. Doi,
Satoshi Shimano,
Takuya Matsunaga,
Y. Tokura,
Y. Taguchi
Publication year - 2021
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.35848/1882-0786/ac251e
Subject(s) - negative thermal expansion , crystallite , materials science , thermal expansion , atmospheric temperature range , lattice (music) , crystal structure , porosity , thermal , phase transition , condensed matter physics , thermodynamics , composite material , crystallography , chemistry , metallurgy , physics , acoustics
Thermal expansion properties are investigated for Ti 2 O 3 -based sintered polycrystalline materials by controlling crystal lattice parameters and porous structures. Negative thermal expansion (NTE) is observed in a temperature range between room temperature and 593 K, and found to exceed Δ L / L = −0.7% at high temperatures, in spite of continuous increase of the unit cell volume. The temperature range for the significant NTE is successfully tuned by modifying electron-lattice-coupled phase-transition temperature. The magnitude of the NTE is enhanced upon introducing pores, indicating the importance of microstructural effect. These results demonstrate high potential of Ti 2 O 3 -based materials for practical applications.