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Kawakita, Yukinobu
no journal, ,
I will report our results obtained from project research entitled as "Mechanism of the function expression caused by disordered structure" which is performed in facility use beamtime. In this project, we focus on physical phenomena where randomness enbedded into crystalline materials rules macroscopic functional properties as well as totally disordered materials such as liquid and glasses. The results are mainly on studies of atomic dynamics relating to function expression by using neutron instruments of BL02 (DNA) and BL14 (AMATERAS) and so on.
Shamoto, Shinichi
no journal, ,
Kawakita, Yukinobu; Li, B.; Kawasaki, Takuro; Kikuchi, Tatsuya*; Kiyanagi, Ryoji; Inamura, Yasuhiro; Ohara, Takashi; Shibata, Kaoru; Kofu, Maiko; Nakamura, Mitsutaka; et al.
no journal, ,
Research results obtained in JAEA Project Research "Mechanism of the function expression caused by disordered structure" will be focused in this presentation. The purpose of this project is to reveal mechanism of the function expression of functional materials where randomness involved in crystalline structure plays an key role, by applying the method and analyses frequently used in random material physics. We will report the results of liquid bismuth with complex structure which was investigated by time-space correlation function, and low thermal conductivity in layered thermoelectric material and next-generation solar cell which was investigated by neutron inelastic scattering measurements.
Kawakita, Yukinobu
no journal, ,
At J-PARC, AMATERAS and DNA are frequently used for QENS measurements. The former is the direct geometry inelastic neutron spectrometer with pulse-shaping and monochromating disk choppers which enable us to access a wide range of incident neutron energy from 1 to 80 meV. The multi Ei method is very useful for catching overall features from slow and large-scale dynamics to fast and atomic-scale dynamics simultaneously. The latter is the near back-scattering inelastic neutron spectrometer with a pulse-shaping chopper and Si111 analyzer mirrors which enable us to access energy transfer range of -500 to 1500 micro eV with high resolution of 2.4 micro eV. The extremely high signal-to-noise ratio extends QENS and INS applications widely. My talk consists of three parts. (1) Current status of MLF, J-PARC, (2) QENS study of functional materials, and (3) reduction of time-space correlation function of liquid metal.
Kawakita, Yukinobu
no journal, ,
In the workshop on neutron and X-ray characterizations on caloric materials (NXCalorics-2019) held on August 15 and 16, 2019 at the Institute of Metal Research, Chinese Academy of Science, in Shengyang, China, neutron research activities at Materials and Life Science Experimental Facility (MLF), J-PARC have been introduced. Three topics on colossal barocaloric effects in plastic crystal, polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH
NHPbI, and liquid-like thermal conduction in intercalated layered crystalline solids, which all have been published in high impact academic journals and press-released at JAEA, are introduced as well as current status of MLF, J-PARC.