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Torigoe, Shuhei*; Ishimoto, Yutaro*; Aoishi, Yuhei*; Murakawa, Hiroshi*; Matsumura, Daiju; Yoshii, Kenji; Yoneda, Yasuhiro; Nishihata, Yasuo; Kodama, Katsuaki; Tomiyasu, Keisuke*; et al.
Physical Review B, 93(8), p.085109_1 - 085109_5, 2016/02
Times Cited Count：5 Percentile：25.9(Materials Science, Multidisciplinary)Torigoe, Shuhei*; Ishimoto, Yutaro*; Hanasaki, Noriaki*; Nogami, Yoshio*; Matsumura, Daiju; Yoshii, Kenji; Yoneda, Yasuhiro; Nishihata, Yasuo
Journal of Physics; Conference Series, 320, p.012078_1 - 012078_4, 2011/09
Times Cited Count：1 Percentile：33.9(Physics, Condensed Matter)The X-ray absorption spectra of some pyrochlore niobates reveal the valence of the Nb ion in each material, and the displacement of the Nb ions from the center of the oxygen octahedra in the pyrochlore niobates YCaNb
O
and NdCaNbO, which is consistent with the previous report of the neutron diffraction.
Nara, Shintaro*; Torigoe, Shuhei*; Hanasaki, Noriaki*; Nogami, Yoshio*; Matsumura, Daiju; Yoshii, Kenji; Yoneda, Yasuhiro; Nishihata, Yasuo
no journal, ,
We have investigated the physical properties of pyrochlore niobates YCaNbO and NdCaNbO. From synchrotron X-ray absorption and thermogravimetric measurements, the average valence of Nb ion in these oxides was determined as 4.5+, indicating the existence of charge frustration on the Nb site. These oxides have been found to show some intriguing properties such as the absence of magnetic moment of Nb, large thermoelectric effect and ferroelectricity. Possible origins of these phenomena are discussed on the basis of results of X-ray absorption measurements.
