arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2004.10183cond-mat.mtrl-sci
收藏

铁弹应变在BiVO4光吸收中的作用

Role of the ferroelastic strain in the optical absorption of BiVO4

Christina Hill, Mads C. Weber, Jannis Lehmann, Tariq Leinen, Manfred Fiebig, Jens Kreisel, Mael Guennou

摘要:

钒酸铋(BiVO4)由于其在可见光范围内具有良好的吸收边,近年来受到人们的关注。在这里,我们表征的BiVO4单晶的光吸收作为温度和偏振方向的函数的反射和透射光谱。发现光学带隙对温度非常敏感,并且在523K处对单斜到四斜铁弹转变非常敏感。的各向异性,作为测量的吸收边的差异偏振平行和垂直于主轴的光,从0.2 eV的高温tetraxide相减少到0.1 eV在环境温度下。我们表明,这种演变是占主导地位的铁弹剪切应变控制。这些发现为进一步优化钒酸铋基光吸收剂在光催化器件中的应用提供了一条途径。

英文摘要:

Bismuth vanadate (BiVO4) has recently been under focus for its potential use in photocatalysis thanks to its well-suited absorption edge in the visible light range. Here, we characterize the optical absorption of a BiVO4 single crystal as a function of temperature and polarization direction by reflectance and transmittance spectroscopy. The optical band gap is found to be very sensitive to temperature, and to the monoclinic-to-tetragonal ferroelastic transition at 523K. The anisotropy, as measured by the difference in absorption edge for light polarized parallel and perpendicular to the principal axis, is reduced from 0.2 eV in the high-temperature tetragonal phase to 0.1 eV at ambient temperature. We show that this evolution is dominantly controlled by the ferroelastic shear strain. These findings provide a route for further optimization of bismuth-vanadate-based light absorbers in photocatalytic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑