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Kasahara, Takamitsu*; Takigami, Machiko*; Nagasawa, Naotsugu; Takigami, Shoji*
Transactions of the Materials Research Society of Japan, 34(3), p.395 - 398, 2009/09
no abstracts in English
O
Hayakawa, Hironori*; Morimoto, Masanori*; Ikeda, Naoshi*; Yoneda, Yasuhiro; Kohara, Shinji*; Yoshii, Kenji; Matsuo, Yoji*; Michiuchi, Takamasa*; Mori, Shigeo*
Transactions of the Materials Research Society of Japan, 34(1), p.51 - 54, 2009/05
We have recently reported that LuFeO becomes ferroelectric below 330 K, owing to a charge-ordering transition of Fe ions. As details of the properties of this material have not been reported so far, we have investigated its local structure in the ferromagnetic phase by means of synchrotron X-ray diffraction. The analysis of pair-distribution function showed the existence of displacement of Lu atoms; this structure is different from the average structure of this materials known thus far. This result encourages a detailed reinvestigation of crystal structure of LuFeO. We also show the results obtained from some other experimental methods, such as dielectric measurement and electron diffraction.
Ti
O
Yoneda, Yasuhiro; Yoshii, Kenji; Hayakawa, Hironori*; Ikeda, Naoshi*
Transactions of the Materials Research Society of Japan, 34(1), p.15 - 18, 2009/03
Recently, there has been considerable interest in the dielectric properties of the cubic perovskite CaCuTiO. The material has shown to have high and relatively temperature independent dielectric permittivity over a wide temperature range from 100 to 600 K. Below 
100 K the permittivity drops by almost three orders of magnitude, but is not accompanied by a structural phase transition. We studied CaCuTiO hoping to find signatures of local structural distortions that may explain the observe anomalies in the dielectric properties. Experiments were carried out using synchrotron radiation at several temperatures between room temperature and 10 K. Reconsideration is necessary for interpreting a huge permittivity by the local disorder model.
Nb)O
studied by X-ray diffractionOwada, Kenji; Hirota, Kazuma*; Terauchi, Hikaru*; Owa, Hidehiro*; Yasuda, Naohiko*
no journal, ,
no abstracts in English
and TbFeYoneda, Yasuhiro; Abe, Hiroshi
no journal, ,
TbFe and SmFe are well-known giant magnetostrictive materials and they show different behavior when Ar ions irradiated. Since SmFe and TbFe are the same crystal structure, the same mechanism of spontaneous magnetization should exist. The different ion irradiation effects may be caused by the different internal stress between SmFe and TbFe2 films. However, it has been difficult to analyze the internal strain in the amorphous films. The purpose of this article is to clarify the local structure of amorphous SmFe and TbFe and clarify the relationship between the ion irradiation effect and the magneticostrictive susceptivity. Structure analysis was carried out using synchrotron X-ray pair-distribution function method. The internal strain can be evaluated by the deviation between the amorphous and crystalline structures. The deviation of the TbFe was larger than that of the SmFe. Large deviation causes large internal strain, which is reduced by the ion irradiation.
Takigami, Machiko*; Hiroki, Akihiro; Nagasawa, Naotsugu; Kasahara, Takamitsu*; Takigami, Shoji*; Tamada, Masao
no journal, ,
Okabe, Toshihiro*; Ono, Hiroyuki*; Hatayama, Ichiro*; Waguri, Atsushi*; Sawada, Yuzuru*; Tsugawa, Hidehito*; Ichida, Tadao*; Nakane, Akio*; Sano, Teruo*; Tanaka, Kazuaki*; et al.
no journal, ,
