投稿者 : taku 投稿日時： 2010-01-25 23:44:35 (6625 ヒット)
X-ray scattering cross section of an atom is given by the number of its elections. Therefore, it is not easy to see light elements, which are indeed practically very important since they can move in a certain class of solids which makes them useful for the fuel cell or oxygen transport ceramic membrane. Neutrons scattering cross section does not depend on the number of elections, and indeed neutrons can be reasonably scattered by light elements. Therefore, we can investigate the position and dynamics of light elements in solids. Using this unique feature, a group comprising researchers from Tokyo Tech. and Kyushu Univ. has succeeded in visualizing the oxygen conduction path in the praseodymium nickel oxide (Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+d. This material conducts both the ions and holes at the same time, and is hoped to be applicable to the solid oxide fuel cell and oxygen transport ceramic membrane. This work has been carried out using the IMR's HERMES neutron diffractometer, installed at the JRR-3 research reactor, through the ISSP-NSL user program, and will be published in J. Am. Phys. Soc., a leading journal in the field of chemistry and materials science. For details, please visit press release at Tokyo Tech.
投稿者 : taku 投稿日時： 2009-10-29 15:21:37 (7705 ヒット)
"Dirac predicted, and we observed" may be a hype, but a team from Tokyo Metropolitan University, Kyoto University, ISSP, NIST, and Kyushu Institute of Technology surely observed "magnetic monopoles", or exactly speaking their mathematical equivalents, as an elementary excitation from the degenerated ground states of the spin ice Dy2Ti2O7. This result has been published in J. Phys. Soc. Jpn., as well as featured in several articles such as Nature News, NIST Tech Beat, Optics and Photonics Focus, 2physcics...