Pressure-induced Transformations of a Molecular Crystal, Decaborane.
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Accession number;02A0335437
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| Title;Pressure-induced Transformations of a Molecular Crystal, Decaborane. |
| Author;
NAKANO SATOSHI
(Busshitsu・zairyokenkyukikobusshitsuken)
HEMLEY R J
(Geophysical Lab. And Center For High-pressure Res., Carnegie Institution Of Washington)
GREGORYANZ E A
(Geophysical Lab. And Center For High-pressure Res., Carnegie Institution Of Washington)
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Journal Title;Program and Abstracts of Papers. High Pressure Conference of Japan
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Journal Code:L1222A
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ISSN:0917-6373
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VOL.42nd;NO.;PAGE.17(2001)
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| Figure&Table&Reference;FIG.1, REF.4 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Decaborane, a molecular boron hydride, was compressed up to 131 GPa at room temperature to explore non-molecular phase of boron hydride. Decaborane changed its color from transparent yellow to orange/red above 50 GPa and then to black above 100 GPa, suggesting some transformations. Raman scattering and infrared (IR) absorption spectroscopy supported the structural changes. Above 50 GPa the sample changed color from transparent yellow to orange/red. Raman/IR peaks suggested an essential change of the B-H-B bridge and an existence of terminal hydrogen atoms in the material, which means that the new phase above 50 GPa is also molecular in nature. Above 100 GPa, however, B-B skeletal, B-H-B and B-H Raman/IR peaks gradually disappeared, which implies a transformation into a non-molecular phase in which conventional borane-type bonding is lost. The band gap of the material at 100 GPa was estimated to be 1.0 eV corresponding semiconductor. The extrapolation of the band gap to higher pressure indicates metallization at about 250 GPa. (author abst.) |
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