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Barium Silicate (barium + silicate)

Distribution by Scientific Domains
Chemistry75%

Selected Abstracts

ChemInform Abstract: Lithium Barium Silicate, Li2BaSiO4, from Synchrotron Powder Data.

CHEMINFORM, Issue 30 2009
Jinyoung Kim
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Lithium barium silicate, Li2BaSiO4, from synchrotron powder data

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2009
Jinyoung Kim
The structure of lithium barium silicate, Li2BaSiO4, has been determined from synchrotron radiation powder data. The title compound was synthesized by high-temperature solid-state reaction and crystallizes in the hexagonal space group P63cm. It contains two Li atoms, one Ba atom (both site symmetry ..m on special position 6c), two Si atoms [on special positions 4b (site symmetry 3..) and 2a (site symmetry 3.m)] and four O atoms (one on general position 12d, and three on special positions 6c, 4b and 2a). The basic units of the structure are (Li6SiO13)5, units, each comprising seven tetrahedra sharing edges and vertices. These basic units are connected by sharing corners parallel to [001] and through sharing (SiO4)4, tetrahedra in (001). The relationship between the structures and luminescence properties of Li2SrSiO4, Li2CaSiO4 and the title compound is discussed. [source]

Synthesis of Hexacelsian Barium Aluminosilicate by a Solid-State Process

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2000
Kuo-Tong Lee
Synthesis of hexacelsian barium aluminosilicate (BaAl2Si2O8 or BAS) from BaCO3, Al2O3, and amorphous SiO2 was examined. BaCO3 can react with SiO2 and Al2O3 to form barium silicates (Ba2SiO4 or B2S, BaSiO3 or BS, and BaSi2O5 or BS2) and barium aluminate (BaAl2O4 or BA). It is shown that there are two competitive reactions leading to the formation of hexacelsian BAS. One involves a reaction between BS2 and Al2O3 and the other involves a reaction between BA and SiO2. In experiments with the model BS2,Al2O3 and BA,SiO2 systems it is shown that the reaction between BS2 and Al2O3 is much faster than the reaction between BA and SiO2. However, in the BAS system, Al2O3 suppresses the reactions which form BS2 and instead reacts with B2S and BS to form BA. The kinetics of hexacelsian BAS formation are greatly enhanced when BS2 is made separately and fired with Al2O3 to yield BAS. [source]