Hinterstein Manuel, Lemos da Silva Lucas, Knapp Michael, Schoekel Alexander, Etter Martin, Studer Andrew
Fraunhofer IWM, Freiburg, Germany.
Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany.
J Appl Crystallogr. 2023 Aug 1;56(Pt 4):1242-1251. doi: 10.1107/S1600576723005940.
Complex functional materials play a crucial role in a broad range of energy-related applications and in general for materials science. Revealing the structural mechanisms is challenging due to highly correlated coexisting phases and microstructures, especially for or investigations. Since the grain sizes influence the properties, these microstructural features further complicate investigations at synchrotrons due to the limitations of illuminated sample volumes. In this study, it is demonstrated that such complex functional materials with highly correlated coexisting phases can be investigated under conditions with neutron diffraction. For large grain sizes, these experiments are valuable methods to reveal the structural mechanisms. For an example of experiments on barium titanate with an applied electric field, details of the electric-field-induced phase transformation depending on grain size and frequency are revealed. The results uncover the strain mechanisms in barium titanate and elucidate the complex interplay of stresses in relation to grain sizes as well as domain-wall densities and mobilities.
复杂功能材料在广泛的能源相关应用以及材料科学领域中发挥着关键作用。由于共存相和微观结构高度相关，揭示其结构机制具有挑战性，特别是对于……或……研究而言。由于晶粒尺寸会影响材料性能，且同步加速器中受照射样品体积有限，这些微观结构特征使得相关研究进一步复杂化。在本研究中，结果表明，利用中子衍射在……条件下可以对具有高度相关共存相的此类复杂功能材料进行研究。对于大晶粒尺寸，这些实验是揭示结构机制的宝贵方法。以施加电场的钛酸钡实验为例，揭示了取决于晶粒尺寸和频率的电场诱导相变的细节。结果揭示了钛酸钡中的应变机制，并阐明了与晶粒尺寸以及畴壁密度和迁移率相关的应力之间的复杂相互作用。
