Tunable giant negative thermal expansion in Ti2O3-based polycrystalline materials | Zendy

Atsunori Doi | Zendy; Satoshi Shimano | Zendy; Takuya Matsunaga | Zendy; Yoshinori Tokura | Zendy; Y. Taguchi | Zendy

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Tunable giant negative thermal expansion in Ti₂O₃-based polycrystalline materials

Author(s) -

Atsunori Doi,

Satoshi Shimano,

Takuya Matsunaga,

Yoshinori 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.

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