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 593K, 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.

通过控制晶格参数和多孔结构，研究了Ti ₂ O ₃基烧结多晶材料的热膨胀性能。在室温和 593K 之间的温度范围内观察到负热膨胀 (NTE)，发现在高温下超过ΔL / L =-0.7%，尽管晶胞体积不断增加。通过修改电子晶格耦合相变温度，成功调整了显着 NTE 的温度范围。NTE 的大小在引入孔时增强，表明微观结构效应的重要性。这些结果证明了 Ti ₂ O _{3的高潜力}用于实际应用的材料。