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Crystal Structure and Chemical Bonding of Layered α-In2Se3
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-11-09 , DOI: 10.1021/acs.jpcc.3c05991
Haoqing Li 1, 2 , Jun Luo 1, 2 , Jiawei Zhang 1, 2 , Xun Shi 1, 2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-11-09 , DOI: 10.1021/acs.jpcc.3c05991
Haoqing Li 1, 2 , Jun Luo 1, 2 , Jiawei Zhang 1, 2 , Xun Shi 1, 2
Affiliation
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Layered α-In2Se3 has found widespread applications in the electronic, optoelectronic, and thermoelectric fields. However, the crystal structure of α-In2Se3, which plays a fundamental role in understanding its diverse physical properties, remains poorly explored. In this study, we present a comprehensive analysis of the temperature-dependent evolution of lattice constants, fractional coordinates, and atomic displacement parameters of α(3R)-In2Se3 using high-resolution synchrotron powder X-ray diffraction. The temperature range of investigation spans from 114.2 to 472.2 K. From temperature-dependent cell parameters, the linear thermal expansion coefficients along the a-axis and c-axis at room temperature are determined as 0.71 × 10–5 K–1 and 1.83 × 10–5 K–1, respectively, giving rise to a marked anisotropy owing to the weak interlayer interactions along the c-axis. Through modeling of isotropic atomic displacement parameters, the Debye temperature is evaluated to be 173 K, showing good agreement with the result by fitting the low-temperature heat capacity data. Furthermore, we conduct chemical bonding analysis within the quantum theory of atoms in molecules and reveal that α(3R)-In2Se3 exhibits polar covalent intralayer bonds with weak van der Waals interlayer interaction.
中文翻译:
层状α-In2Se3的晶体结构和化学键
层状α-In 2 Se 3在电子、光电和热电领域有着广泛的应用。然而,α-In 2 Se 3的晶体结构对于理解其多种物理性质起着重要作用,但对其的探索仍然很少。在这项研究中,我们利用高分辨率同步加速器粉末X射线衍射对α(3R)-In 2 Se 3的晶格常数、分数坐标和原子位移参数的温度依赖性演化进行了全面分析。研究的温度范围为 114.2 至 472.2 K。根据与温度相关的电池参数,室温下沿a轴和c轴的线性热膨胀系数确定为 0.71 × 10 –5 K –1和 1.83 ×分别为10 –5 K –1 ,由于沿c轴的层间相互作用较弱,导致显着的各向异性。通过各向同性原子位移参数建模,计算出德拜温度为173 K,与低温热容数据拟合结果吻合良好。此外,我们在分子中原子的量子理论中进行化学键分析,发现α(3R)-In 2 Se 3表现出极性共价层内键和弱范德华层间相互作用。
更新日期:2023-11-09
中文翻译:

层状α-In2Se3的晶体结构和化学键
层状α-In 2 Se 3在电子、光电和热电领域有着广泛的应用。然而,α-In 2 Se 3的晶体结构对于理解其多种物理性质起着重要作用,但对其的探索仍然很少。在这项研究中,我们利用高分辨率同步加速器粉末X射线衍射对α(3R)-In 2 Se 3的晶格常数、分数坐标和原子位移参数的温度依赖性演化进行了全面分析。研究的温度范围为 114.2 至 472.2 K。根据与温度相关的电池参数,室温下沿a轴和c轴的线性热膨胀系数确定为 0.71 × 10 –5 K –1和 1.83 ×分别为10 –5 K –1 ,由于沿c轴的层间相互作用较弱,导致显着的各向异性。通过各向同性原子位移参数建模,计算出德拜温度为173 K,与低温热容数据拟合结果吻合良好。此外,我们在分子中原子的量子理论中进行化学键分析,发现α(3R)-In 2 Se 3表现出极性共价层内键和弱范德华层间相互作用。