利用施設：SPring-8(BL22XU) 課題番号：2014A-E25 利用課題名（日本語）：蛍光 X 線ホログラフィー法によりの Pb(Zr,Ti)O3 の局所構造の研究 Program Title (English) ：Study of the local structure in Pb(Zr,Ti)O3 (PZT) by x-ray fluorescence holography ：林好一 1), 胡雯 2)，大和田謙二３)，八方直久４)，細川伸也５) 利用者名（日本語） Username (English) ：A. K. Hayashi1), W. Hu2), K. Ohwada3), N. Happo4), S. Hosokawa5) ：1) 東北大学, 2) Brookhaven National Laboratory, 3) 日本原子力研究開発機構, 4) 所属名（日本語）広島市立大学, 5) 熊本大学 Affiliation (English) ：1) Tohoku University, 2) Brookhaven National Laboratory, 3) Japan Atomic Energy Agency, 4)Hiroshima City University, 5) Kumamoto University キーワード：強誘電体,局所構造, 蛍光Ｘ線ホログラフィー法１．概要（Summary ）３．結果と考察 Lead zirconate-titanate Pb(Zr,Ti)O3 (PZT) is the （ most widely used ferroelectric piezoelectric system Discussion） in multilayer actuators, sonar and ultrasonic Right figure shows transducers, and ultrasonic motors owing to its reconstructed excellent electro-mechanical properties [1]. Neither atomic PZ nor PT are particularly good piezoelectrics, but center Zr/Ti plane, mixing these materials gives rise to excellent which paralleled to the (001) plane at z=0 Å. The piezoelectric the crosses of dotted lines indicates ideal positions of microscopic origin leading to very high dielectric Zr/Ti atoms and center red spot indicates the position and piezo-electric responses and the local structure of emitter Ti. Neighboring Zr/Ti atoms are clearly of PZT is essential for designing of new and visible and the positions of obtained atomic images improved agreed with theoretical positions. However, Zr/Ti response. materials. Understanding However, of accurate local Results and image structure of PZT is not clear yet due to the atomic difficulties in studying nano-scale inhomogeneity indicating existence of local distortion. For bettering and growing sufficient large size of PZT single understanding, local structure around Zr and Pb will crystals. In this work, we investigated the local be investigated in the future beamtime. structure around Ti atoms in Pb(Zi0.7Ti0.3)O3 single ４．その他・特記事項（Others） crystal [2] using x-ray fluorescence holography [1] J. F. Scott, Science 315, 954 (2007). (XFH) technique. XFH is a novel model-free technique for determining ２．実験（Experimental） the 3D atomic arrangement around a specific element XFH experiment was carried out at BL22XU of at atomic resolution. SPring-8 synchrotron facility. The incident X-ray energies were 18.5 KeV - 22 keV with 0.25 keV steps. Ti Kα (4.5 keV) x-ray fluorescence was collected using graphite-crystal photodiode analyzer. detector Using with a multi-energy holograms, 3D real space local structures around Ti were successfully obtained. images of split along radiation direction,