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- Silicon_boride abstract "Silicon borides (also known as boron silicides) are lightweight ceramic compounds formed between silicon and boron. Several stoichiometric silicon boride compounds, SiBn, have been reported: silicon triboride, SiB3, silicon tetraboride, SiB4, silicon hexaboride, SiB6, as well as SiBn (n = 14, 15, 40, etc.). The n = 3 and n = 6 phases were reported as being co-produced together as a mixture for the first time by Henri Moissan and Alfred Stock in 1900 by briefly heating silicon and boron in a clay vessel. The tetraboride was first reported as being synthesized directly from the elements in 1960 by three independent groups: Carl Cline and Donald Sands; Ervin Colton; and Cyrill Brosset and Bengt Magnusson. It has been proposed that the triboride is a silicon-rich version of the tetraboride. Hence, the stoichiometry of either compound could be expressed as SiB4 - x where x = 0 or 1. All the silicon borides are black, crystalline materials of similar density: 2.52 and 2.47 g cm−3, respectively, for the n = 3(4) and 6 compounds. On the Mohs scale of mineral hardness, SiB4 - x and SiB6 are intermediate between diamond (10) and ruby (9). The silicon borides may be grown from boron-saturated silicon in either the solid or liquid state.The SiB6 crystal structure contains interconnected icosahedra (polyhedra with 20 faces), icosihexahedra (polyhedra with 26 faces), as well as isolated silicon and boron atoms. Due to the size mismatch between the silicon and boron atoms, silicon can be substituted for boron in the B12 icosahedra up to a limiting stoichiometry corresponding to SiB2.89. The structure of the tetraboride SiB4 is isomorphous to that of boron carbide (B4C), B6P, and B6O. It is metastable with respect to the hexaboride. Nevertheless, it can be prepared due to the relative ease of crystal nucleation and growth.Both SiB4 - x and SiB6 become superficially oxidized when heated in air or oxygen and each is attacked by boiling sulfuric acid and by fluorine, chlorine, and bromine at high temperatures. The silicon borides are electrically conducting. The hexaboride has a low coefficient of thermal expansion and a high nuclear cross section for thermal neutrons.The tetraboride was used in the black coating of some of the space shuttle heat shield tiles.".
- Silicon_boride wikiPageID "33486754".
- Silicon_boride wikiPageRevisionID "550237061".
- Silicon_boride hasPhotoCollection Silicon_boride.
- Silicon_boride subject Category:Boron_compounds.
- Silicon_boride subject Category:Ceramic_materials.
- Silicon_boride subject Category:Inorganic_silicon_compounds.
- Silicon_boride type Abstraction100002137.
- Silicon_boride type BoronCompounds.
- Silicon_boride type CeramicMaterials.
- Silicon_boride type Cognition100023271.
- Silicon_boride type Compound105870180.
- Silicon_boride type Concept105835747.
- Silicon_boride type Content105809192.
- Silicon_boride type Idea105833840.
- Silicon_boride type Material114580897.
- Silicon_boride type Matter100020827.
- Silicon_boride type Part113809207.
- Silicon_boride type PhysicalEntity100001930.
- Silicon_boride type PsychologicalFeature100023100.
- Silicon_boride type Relation100031921.
- Silicon_boride type SiliconCompounds.
- Silicon_boride type Substance100019613.
- Silicon_boride type Whole105869584.
- Silicon_boride comment "Silicon borides (also known as boron silicides) are lightweight ceramic compounds formed between silicon and boron. Several stoichiometric silicon boride compounds, SiBn, have been reported: silicon triboride, SiB3, silicon tetraboride, SiB4, silicon hexaboride, SiB6, as well as SiBn (n = 14, 15, 40, etc.).".
- Silicon_boride label "Silicon boride".
- Silicon_boride sameAs m.0h974z2.
- Silicon_boride sameAs Q7515015.
- Silicon_boride sameAs Q7515015.
- Silicon_boride sameAs Silicon_boride.
- Silicon_boride wasDerivedFrom Silicon_boride?oldid=550237061.
- Silicon_boride isPrimaryTopicOf Silicon_boride.