Fig. 1 Separate analysis of adjacent Nb and Mo in the periodic table using 800 MHz NMR of NIMS[1] M. Tansho, A. Goto, S. Ohki, Y. Mogami, Y. Sakuda, Y. Yasui, T. Murakami, K. Fujii, T. Iijima, and M. Yashima, J. Phys. Chem. C, 126, 13284-13290 (2022). [2] Y. Yasui, M. Tansho, K. Fujii, Y. Sakuda, A. Goto, S. Ohki, Y. Mogami, T. Iijima, S. Kobayashi, S. Kawaguchi, K. Osaka, K. Ikeda, T. Otomo, and M. Yashima, Nat. Commun., 14, 2337 (2023). 52P1-13Adjacent Elemental Analysis of Oxide Fuel Cell Materials by High Field Solid-state NMR Masataka Tansho1, Atsushi Goto1, Shinobu Ohki1, Yuuki Mogami1, Yuta Yasui2, Yuichi Sakuda2, Kotaro Fujii2, Takahiro Iijima3, and Masatomo Yashima2 1 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 2 Department of Chemistry, School of Science, Tokyo Institute of Technology 3 Institute of Arts and Sciences, Yamagata University P1-14NMR Techniques for the Detection of Photo-induced Effects in Solids Atsushi Goto1, Kenjiro Hashi1, and Shinobu Ohki2 1 Center for Basic Research on Materials, National Institute for Materials Science (NIMS). 2 Research Network & Facility Service Division, National Institute for Materials Science (NIMS). [1] A. Goto et al., Rev. Sci. Instrum. 77, 93904 (2006); Jpn. J. Appl. Phys., 50, 126701 (2011). [2] A. Goto, S. Ohki, K. Hashi, and T. Shimizu, Nat. Commun., 2, 378 (2011); npj Quant. Inform., 8, 59 (2022); JPS Conf. Proc. 38, 011185 (2023). The photo-induced effects in solids play useful roles in our lives through optoelectronics, photocatalysts, etc. The mechanisms of these effects can be well understood by in-situ detection of changes in the states caused by light illumination. For this purpose, we have been developing nuclear magnetic resonance (NMR) systems that operate under light illumination [1]. These systems have been successfully applied to investigations of optical effects in semiconductors [2]. One of the challenges in the development is the stable control of sample temperature under light illumination. In our previous systems, samples were cooled through thermal conduction to the GM refrigerator in a vacuum environment, and the absence of exchange gas resulted in insufficient cooling efficiency. To address this issue, we have developed a “sample chamber” that encapsulates the sample and detection coil in exchange gas, enabling efficient removal of heat generated by light irradiation. In this presentation, the details of the system under development, including the sample chamber, will be reported. This work has been partly supported by JSPS KAKENHI Grant Nos. JP21K18897; JP23H01131; and JP23K25828. Ba3MoNbO8.5 [1], Ba7Nb4MoOw [2], and related materials are gaining attention as materials that can surpass yttria stabilized zirconia (YSZ) for oxide fuel cells. The local structure around niobium (Nb) and molybdenum (Mo) is thought to be important for oxygen (O) ions and proton (H) mobility. Mo and Nb, which are adjacent to each other on the periodic table (Figure 1), have been treated as the same because they are difficult to distinguish by ordinary XRD analysis, but NMR results using the NIMS 800 MHz NMR system show that Nb and Mo are clearly different.
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