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Name (Title): Takao Mori (Senior Researcher) Affiliation: International Center for Materials Nanoarchitectonics (MANA), NIMS Address: 1-1 Namiki, Tsukuba. Ibaraki 305-0044, Japan Email: MORI.Takao@nims.go.jp Home Page: Presentation Title: Multifunctional Boron Network Compounds as Novel Energy Materials <strong>Abstract</strong>: Boron is an interesting element, tending to form atomic networks based on clusters and 2D atomic nets in compounds. In this sense it is similar to carbon, which has been much more extensively studied for such materials as fullerenes, nanotubes, and graphite-related materials such as GICs and graphene. A rich vein of materials science potential remains to be tapped and this is illustrated quite well by the recent surprising discoveries of striking phenomena in compounds containing boron. Boron has one less electron than carbon and thus is electron deficient when forming atomic networks, but this causes it to have a special affinity with the rare earth elements and as a result, it forms myriad compounds. This is an excellent combination, because the rare earth atoms supply electrons to the boron atomic framework to stabilize and form novel structures, while the shell of f electrons will supply interesting properties like magnetism. From an application standpoint, the strong covalent boron cluster framework supplies a light robust “armor” which is acid and corrosion resistant and can withstand high temperatures. Attractive electronic, magnetic, and thermal properties can be developed from the inside through metal atom constituents to utilize the protective properties of this network for applications, e.g. discovery of the first n-type boron cluster compound; a possible high temperature thermoelectric counterpart to p-type boron carbide. As an emerging novel phenomenon, it has also been found that a structural building block; the B12 icosahedra cluster, is a novel mediator of magnetic interaction. An overview on synthesis methods and physical phenomena is given together with strategies for developing novel and effective thermoelectric materials. References: Takao Mori, “Higher Borides” in Handbook on the Physics and Chemistry of Rare Earths, Vol. 38, ed. K. A. Gschneidner Jr., J. -C. Bunzli, and V. Pecharsky (North-Holland, Amsterdam, 2008) p. 105-173 (2008). 46 Poster Session PM-4
Name (Title): Tadashi C. Ozawa (MANA Researcher) Takayoshi Sasaki (MANA Principal Investigator) Affiliation: International Center for Materials Nanoarchitectonics (MANA), NIMS Address: 1-1 Namiki, Tsukuba. Ibaraki 305-0044, Japan Email: OZAWA.Tadashi@nims.go.jp SASAKI.Takayoshi@nims.go.jp Home Page: http://www.nims.go.jp/softchem/index-e.html Presentation Title: Preparation and photoluminescence characterizations of Ln-photoactivated oxide nanosheets for new phosphor development <strong>Abstract</strong>: Nanomaterials have many practical properties for developing phosphor materials. Especially, those with the sheet morphology are suitable for optical device fabrications. We have recently prepared a new kind of nanosheet-based phosphors. These new phosphors consist of transition metal oxide nanosheets as hosts and intrananosheet site Ln (rare earth) ions as photoactivators. The emission wavelength of the Ln photoactivators is characteristic to the f-f transitions of each Ln ion. Thus, phosphors with a desired emission wavelength can be designed utilizing the Ln activators. In addition, the morphology of the nanosheet host can be utilized to effectively absorb excitation energy and to reduce the cross relaxation among the nearby photoactivators. Moreover, by incorporating the Ln activators in intrananosheet sites rather than in internanosheet sites, efficient host-to-activator transfer of excitation energy is expected due to the close interaction between the nanosheet hosts and the activators. The concept of new nanosheet-based phosphor design, and preparation and characterizations of the new nanosheet phosphors will be presented. Fig. 1 Photoluminescence emission spectrum and photograph of (K1.5Eu0.5)Ta3O10 nanosheet suspension under UV irradiation. Poster Session PM-5 References : [1] T. C. Ozawa; K. Fukuda; K. Akatsuka; Y. Ebina; T. Sasaki; Chem. Mater., 19, (2007) 6575- 6580. [2] T. C. Ozawa; K. Fukuda; K. Akatsuka; Y. Ebina; T. Sasaki; K. Kurashima; K. Kosuda; J. Phys. Chem. C., 112 (2008) 1312-1315. [3] T. C. Ozawa; K. Fukuda; K. Akatsuka; Y. Ebina; T. Sasaki; K. Kurashima; K. Kosuda; J. Phys. Chem. C, 112 (2008)17115-17120. 47
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Welcome address Teruo Kishi Chief P
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Nano-Materials 2 (Chair: Takayoshi
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February 27 th ICYS 1 (Chair: Sukek
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Nano-Materials Poster Session 26 th
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PS-9 Synthesis and characterization
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PIS-4 Superconductivity of FeSe and
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