7440-39-3Relevant articles and documents
Garner, W. E.,Moon, C. H.
, (1933)
On the volatility of barium, strontium, and calcium
Mallet
, p. 354 - 357 (1876)
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New ternary and quaternary barium nitride halides; Synthesis and crystal chemistry
Bailey, Andrew S.,Hughes, Robert W.,Hubberstey, Peter,Ritter, Clemens,Smith, Ronald I.,Gregory, Duncan H.
, p. 9545 - 9553 (2011)
New ternary and quaternary nitride halides, Ba2N(X,X′) (X = F, Cl, Br; X′ = Br, I), have been synthesized from the high temperature reactions of barium subnitride with the respective barium halides under an inert atmosphere. The former include the first fully characterized barium nitride halides for X other than F, and the latter are the first examples of barium nitride mixed halides. The variation in structure with composition has been investigated by powder X-ray and powder neutron diffraction techniques. The heavier ternary and quaternary nitride halides (X, X′ = Cl, Br, I) crystallize in the hexagonal space group R3m, with the anti-α-NaFeO2 structure. Ba2NF forms with both an anti-α-NaFeO2 structure, in which N3- and F - are ordered and an anion-disordered simple rock salt structure. The hexagonal polymorph of Ba2NF is the only example to date of a nitride fluoride adopting this layered structure. Both the ternary and the quaternary compounds display very weak, temperature independent paramagnetism.
Rutledge, W. C.,Rittner, E. S.
, p. 167 - 173 (1957)
Ba21Ge2O5H24 and Related Phases. A Corrected Structure Type and Composition for a Zintl Phase Stabilized by Hydrogen
Huang, Baoquan,Corbett, John D.
, p. 1892 - 1899 (1998)
Syntheses of the so-called suboxide phases Ba21T2O5 (T = Ge, Si, Ga, In, Tl) are achieved only in the presence of hydrogen. The heavy-atom structure of Ba21Ge2O5H24 at room temperature was redetermined by single-crystal X-ray diffraction and found to be primitive trigonal symmetry (P3121 (No. 152), Z = 6, a = 14,4227(5) ?, c = 35.332(3) ?) instead of the previously refined cubic (Fd3?m) result. The change greatly improves the heavy-atom parameters. Twenty-four independent deuterium atoms have also been located by time-of-flight neutron diffraction, The structure contains Ba2+ cations, and three different types of monatomic anions. corresponding to the oxidation states (Ba+2)21(Ge-4)2(O-2) 5(H-)24. The deuterium atoms occupy tetrahedral, square-pyramidal, and octahedral barium interstices while the oxide anions lie in nearly regular octahedral barium polyhedra. The germanide anions are surrounded by 12 barium atoms in a distorted icosahedral configuration. Property measurements show that Ba21Ge2O5H24 is diamagnetic and is a semiconductor (or insulator). The analogues Ba21Tr2O5Hx, Tr = Ga, In, Tl, are isotypic with the heavy-atom structure of the title phase and presumably contain 22 hydride ions.
Organic dye compositions and use thereof in photovoltaic cells
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, (2008/06/13)
The present invention provides in one aspect a composition having at least one croconine derivative. This composition may be disposed on a semiconductor layer which is further disposed on an electrically conductive surface to provide a dye-sensitized electrode. The dye-sensitized electrode can be assembled together with a counter electrode and a redox electrolyte to provide a photovoltaic cell. The photovoltaic cell may be used as a single cell or in tandem with other cells.
