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Journal Articles

Retreat from stress; Rattling in a planar coordination

Suekuni, Koichiro*; Lee, C. H.*; Tanaka, Hiromi*; Nishibori, Eiji*; Nakamura, Atsushi*; Kasai, Hidetaka*; Mori, Hitoshi*; Usui, Hidetomo*; Ochi, Masayuki*; Hasegawa, Takumi*; et al.

Advanced Materials, 30(13), p.1706230_1 - 1706230_6, 2018/03

 Times Cited Count:35 Percentile:90.91(Chemistry, Multidisciplinary)

Thermoelectric materials for highly efficient devices must satisfy conflicting requirements of high electrical conductivity and low thermal conductivity. In this paper, we studied the crystal structure and phonon dynamics of tetrahedrites (Cu,Zn)$$_{12}$$(Sb,As)$$_{4}$$S$$_{13}$$. The results revealed that the Cu atoms in a planar coordination are rattling, which effectively scatter phonons. These findings provide a new strategy for the development of highly efficient thermoelectric materials with planar coordination.

Oral presentation

Motion of guest atom in caged structural compound probed by muon

Higemoto, Wataru; Ito, Takashi; Takabatake, Toshiro*; Suekuni, Koichiro*

no journal, , 

Motion of a guest atom in caged structural compound is important in connection with the search for efficient thermoelectric materials. We have studied the local motion of a guest atom in the type-I crathrates Ba$$_8$$Ga$$_{16}$$Si$$_{30}$$ by using muon spin relaxation method. We will report the detail of the results.

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