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Maehira, Takahiro; Higashitani, Atsushi*; Higuchi, Masahiko*; Yasuhara, Hiroshi*; Hasegawa, Akira*
Physica B; Condensed Matter, 312-313(1-4), p.103 - 105, 2002/03
Times Cited Count：12 Percentile：53.16(Physics, Condensed Matter)UBe is a typical heavy-fermion superconductor compound. The lowtemperature electronic specific heat coefficient has the anomalous large value, 
=1.1J/K
mol, which is the largest among the heavy fermion uranium compounds. It also becomes the superconductor below T
=0.85K. Therefore, UBe is an important material as a strongly correlated electron system, and it is necessary to study from both sides of the theory and the experiment. The measurement suggests that the Fermi surface of UBe may consist of small sheets. The energy band structure and the Fermi surface for UBe are calculated by the relativistic linear APW method.
irradiationHojo, Tomohiro*; Yasuhara, Akira*; Yamamoto, Hiroyuki; Aihara, Jun; Furuno, Shigemi*; Sawa, Kazuhiro; Sakuma, Takashi*; Hojo, Kiichi
no journal, ,
Yttria stabilized zirconia (YSZ) is a candidate material as optical and insulating materials in nuclear reactors. The investigation of defect formation under the ion irradiation is therefore required to assess YSZ resistance for radiation damage. Ion irradiation and nanostructural observations were simultaneously performed by transmission electron microscope (TEM) equipped with ion accelerator and X-ray spectrometer (EDS). YSZ was irradiated with 30 keV Ne ions with a flux of 3
10
ions/cm
at 923 K. It is clearly observed that the dislocation loops are formed along (110) crystal plane. The measurements across the loops by EDS show that the composition of oxygen on loops decreases and zirconium increases compared with the matrix. It is also shown that the intensity of Ne increases at the loop. From the previous studies, it was observed that bubbles were formed preferentially on loop planes. It is implied that the irradiated Ne tends to exist in the loops as bubbles.
irradiationHojo, Tomohiro*; Yasuhara, Akira*; Yamamoto, Hiroyuki; Aihara, Jun; Furuno, Shigemi*; Sawa, Kazuhiro; Sakuma, Takashi*; Hojo, Kiichi
no journal, ,
Yttria stabilized zirconia (YSZ) is a candidate material as optical and insulating materials in nuclear reactors. The investigation of defect formation under the ion irradiation is therefore required. In the present study, YSZ was irradiated with 30 keV Ne ions with a flux of 310 ions/cm at 923 K. Compositional changes were analyzed by energy dispersive X-ray spectrometer (EDS) equipped with transmission electron microscope. From the observation of micrographs, it was shown that dislocation loops were formed on three kinds of crystallographic planes, namely, on (110), (111) and (112) planes. The dislocation loops inhabiting on (110) crystal plane were analyzed by EDS along the loops. The average composition between the vicinity of loops and the matrix is compared. On the basis of the obtained results, it is observed composition of oxygen on loops decreases and zirconium increases compared with the matrix.
