Twin Crystal Induced near Zero Thermal Expansion in SnO2 Nanowires
| Autor: | He Zhu, Jiawang Hong, Xianran Xing, Yang Ren, Na Wang, Qinghua Zhang, Qilong Gao, Jun Chen, Qiang Li, Lin Gu, Chao Yang, Jinxia Deng, Kun Lin |
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| Rok vydání: | 2018 |
| Předmět: |
Condensed matter physics
Chemistry Phonon Nanowire Pair distribution function 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis Thermal expansion 0104 chemical sciences symbols.namesake Colloid and Surface Chemistry Condensed Matter::Superconductivity Thermal Hardening (metallurgy) symbols 0210 nano-technology Crystal twinning Raman scattering |
| Zdroj: | Journal of the American Chemical Society. 140:7403-7406 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Knowledge of controllable thermal expansion is a fundamental issue in the field of materials science and engineering. Direct blocking of the thermal expansions in positive thermal expansion materials is a challenging but fascinating task. Here we report a near zero thermal expansion (ZTE) of SnO2 achieved from twin crystal nanowires, which is highly correlated to the twin boundaries. Local structural evolutions followed by pair distribution function revealed a remarkable thermal local distortion along the twin boundary. Lattice dynamics investigated by Raman scattering evidenced the hardening of phonon frequency induced by the twin crystal compressing, giving rise to the ZTE of SnO2 nanowires. Further DFT calculation of Gruneisen parameters confirms the key role of compressive stress on ZTE. Our results provide an insight into the thermal expansion behavior regarding to twin crystal boundaries, which could be beneficial to the applications. |
| Databáze: | OpenAIRE |
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