Abstract
Atomic jumps within the lifetime of a Mössbauer nuclear probe are known to cause a line broadening, which is directly connected to the diffusivity, as predicted theoretically by Singwi and Sjölander in 1960. Many research groups applied and further extended their theory for the studies of elementary jump processes of Fe atoms in single crystals: They analyzed Mössbauer spectrum in terms of line broadening and motional averaging as functions of temperature as well as crystal orientation. To observe such dynamical behaviours, we developed specially designed experimental set-ups such as a high-temperature Mössbauer furnace for laboratory, in-beam and on-line Mössbauer set-ups for accelerator facilities. First of all, we will introduce such measuring techniques suitable for homogeneous materials, explaining their unique features in this chapter. Secondary, we present an imaging technique in Mössbauer spectroscopy which is opening a new possibility to study diffusion processes with a diffusion-length from μm to mm after diffusion annealing at high temperature. This original method enables us to measure the diffusion profiles separately for the different spectral components in the material containing a complex microstructure. As examples, we will explain the studies on Fe diffusion in single and multi-crystalline Si materials using “Mössbauer spectroscopic microscope (MSM),” which enables us to measure the diffusion profiles separately for different chemical states with a spatial resolution of several micrometres. This new method provides a possibility to investigate a diffusion process by considering of the interactions and the correlations between Fe impurities and lattice defects such as dislocations, grain boundaries, and residual stresses in different grains of materials. Finally, we apply this technique to investigate carbon diffusion and segregation processes in Fe-steel, and the mapping images at different temperatures are obtained separately for the spectral components that originated from carbon impurities.
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Acknowledgements
I am entirely indebted to my mentors, Emeritus Profs. F. E. Fujita and S. Nasu, Osaka University, for their creative ideas and kind support to the point defect studies. I thank Emeritus Profs. Y. Maeda and H. Yoshida, KUR Kyoto University, for their warm support to low-temperature irradiation works. Since 1983, I had a lot of exciting opportunities to join the international joint ventures. I sincerely appreciate to Emeritus Prof. G. Vogl, who invited me to Hahn Meitner Institute Berlin and Universität Wien and gave me the best period to perform the Mössbauer diffusion studies by developing Accelerator Spectroscopy. I worked with excellent scientists and acknowledged the collaborations with Dr R. Sielemann HMI, Prof. P. Fratzl MPI of Colloids and Interfaces, Emeritus Prof. A. Seeger MPI Stuttgart, Emeritus Prof. G. Langouche Uni. Leuven, and Dr Y. Kobayashi RIKEN. For JST project for MSM development, I appreciate Dr Y. Ino, Dr K. Tanaka, Mr K. Hayakawa, and Mr K. Yukihira, and many students in my laboratory for intensive supports. Finally, I am deeply appreciated to warm help from Emeritus Profs. G. Langouche, Uni. Leuven and N. Kojima Tokyo univ., for organizing international conferences such as ICAME2011 Kobe and IWMS2018 Nagoya.
The project for developing Mössbauer Spectroscopic Microscopy (MSM) was supported by the “Development of Systems and Technologies for Advanced Measurement and Analysis” Program of Japan Science and Technology Agency (JST). I acknowledge intensive technical supports from APCO Ltd and Hamamatsu Photonics K.K.
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Yoshida, Y. (2021). Mössbauer Spectroscopic Studies on Atomic Diffusion in Materials. In: Yoshida, Y., Langouche, G. (eds) Modern Mössbauer Spectroscopy. Topics in Applied Physics, vol 137. Springer, Singapore. https://doi.org/10.1007/978-981-15-9422-9_9
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