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1.
Acta Crystallogr Sect E Struct Rep Online ; 67(Pt 10): i60, 2011 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-22058682

RESUMO

The title compound, Th(V(2)O(7))(H(2)O)(2), was synthesized by a hydro-thermal reaction. The crystal structure consists of ThO(7)(OH(2))(2) tricapped trigonal prisms that share edges, forming [ThO(5)(OH(2))(2)](n) chains along [010]. The edge-sharing ThO(7)(OH(2))(2) polyhedra share one edge and five vertices with the V(2)O(7) divanadate anions having a nearly ecliptic conformation parallel to [001]. This results in an open framework with the water mol-ecules located in channels. O-H⋯O hydrogen bonding between water molecules and framework O atoms is observed. Bond-valence-sum calculations are in good agreement with the chemical formula of the title compound.

2.
J Phys Condens Matter ; 25(44): 442001, 2013 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-24131870

RESUMO

In this paper, we report the direct chemical synthesis of silicon sheets in gram-scale quantities by chemical exfoliation of pre-processed calcium disilicide (CaSi2). We have used a combination of x-ray photoelectron spectroscopy, transmission electron microscopy and energy-dispersive x-ray spectroscopy to characterize the obtained silicon sheets. We found that the clean and crystalline silicon sheets show a two-dimensional hexagonal graphitic structure.

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