Bauer Sondes, Rodrigues Adriana, Baumbach Tilo
Institute for Photon Science and Synchrotron Radiation IPS, Karlsruhe Institute of Technology KIT, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany.
Laboratory for Application of Synchrotron Radiation LAS, Kaiserstraße 12 76131, Karlsruhe, Germany.
Sci Rep. 2018 Aug 10;8(1):11969. doi: 10.1038/s41598-018-30392-y.
We report about an in situ study of crystalline structural changes during thermal treatment of a BaSrTiO (BSTO) film grown on MgO. The study covers the complete cycle of heating, annealing and cooling and reveals simultaneous phenomena of phase transitions and strain evolution, which have been characterized by in situ 2D reciprocal space mapping (2D-RSM) using high-resolution synchrotron x-ray diffraction in coplanar and grazing incidence geometries. In this way, temperature induced phase transformation from the BSTO2 to the BSTO1 phase has been monitored and the appearance of a further crystalline phase was detected. Moreover, for both BSTO phases, transitions between in-plane compressive and tensile states have been determined during thermal treatment. Furthermore, a contraction of the out-of-plane lattice components has been observed during the annealing phase while the in-plane lattice components remain leading to the change of the residual in-plane strain towards tensile state. The in situ 2D-RSM findings provide valuable and versatile insights into strain engineering and structure modification upon thermal treatment.
我们报道了关于在氧化镁上生长的BaSrTiO（BSTO）薄膜热处理过程中晶体结构变化的原位研究。该研究涵盖了加热、退火和冷却的完整循环，并揭示了相变和应变演化的同步现象，这些现象已通过在共面和掠入射几何结构中使用高分辨率同步加速器X射线衍射的原位二维倒易空间映射（2D-RSM）进行了表征。通过这种方式，监测了温度诱导的从BSTO2相到BSTO1相的相变，并检测到了另一种晶相的出现。此外，对于两个BSTO相，在热处理过程中确定了面内压缩和拉伸状态之间的转变。此外，在退火阶段观察到面外晶格分量的收缩，而面内晶格分量保持不变，导致残余面内应变向拉伸状态变化。原位2D-RSM研究结果为热处理过程中的应变工程和结构改性提供了有价值且通用的见解。
