Tunable giant negative thermal expansion in Ti2O3-based polycrystalline materials
Tunable giant negative thermal expansion in Ti2O3-based polycrystalline materials
复制标题
Ti2O3 基多晶材料中可调节的巨负热膨胀
DOI：
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发表时间：
2021
影响因子：
2.3
通讯作者：
Y. Taguchi
中科院分区：
文献类型：
--
作者：
Atsunori Doi;S. Shimano;T. Matsunaga;Y. Tokura;Y. Taguchi
通过控制晶格参数和多孔结构，研究了 Ti2O3 基烧结多晶材料的热膨胀性能。在室温至 593 K 之间的温度范围内观察到负热膨胀 (NTE)，并且发现在高温下，尽管晶胞体积不断增加，但仍超过 ΔL/L = -0.7%。通过修改电子晶格耦合相变温度成功地调节了显着 NTE 的温度范围。引入孔隙后，NTE 的大小得到增强，表明微观结构效应的重要性。这些结果证明了 Ti2O3 基材料在实际应用中的巨大潜力。
Thermal expansion properties are investigated for Ti2O3-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 ΔL/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 Ti2O3-based materials for practical applications.
影响因子：
15
作者：
Pachoud, Elise;Cumby, James;Attfield, J. Paul
通讯作者：
Attfield, J. Paul