Relevant bibliographies by topics / Icosahedral B12 units

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  2. Dissertations / Theses

Academic literature on the topic 'Icosahedral B12 units'

Author: Grafiati
Published: 6 September 2023
Last updated: 31 July 2025

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Journal articles on the topic "Icosahedral B12 units"

1

Sologub, Oksana, Yuichi Michiue, and Takao Mori. "Boron carbide, B13-xC2-y(x= 0.12,y= 0.01)." Acta Crystallographica Section E Structure Reports Online 68, no. 8 (2012): i67. http://dx.doi.org/10.1107/s1600536812033132.

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Boron carbide phases exist over a widely varying compositional range B12+xC3-x(0.06 <x< 1.7). One idealized structure corresponds to the B13C2composition (space groupR-3m) and contains one icosahedral B12unit and one linear C—B—C chain. The B12units are composed of crystallographically distinct B atoms BP(polar, B1) and BEq(equatorial, B2). Boron icosahedra are interconnected by C atomsviatheir BEqatoms, forming layers parallel to (001), while the B12units of the adjacent layers are linked through intericosahedral BP—BPbonds. The unique B atom (BC) connects the two C atoms of adjacent la
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2

Morito, Haruhiko, Takuji Ikeda, Yukari Katsura, and Hisanori Yamane. "Na3MgB37Si9: an icosahedral B12 cluster framework containing {Si8} units." Acta Crystallographica Section E Crystallographic Communications 78, no. 2 (2022): 203–6. http://dx.doi.org/10.1107/s2056989022000494.

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Single crystals of a novel sodium–magnesium boride silicide, Na3MgB37Si9 [a = 10.1630 (3) Å, c = 16.5742 (6) Å, space group R\overline{3}m (No. 166)], were synthesized by heating a mixture of Na, Si and crystalline B with B2O3 flux in Mg vapor at 1373 K. The Mg atoms in the title compound are located at an interstitial site of the Dy2.1B37Si9-type structure with an occupancy of 0.5. The (001) layers of B12 icosahedra stack along the c-axis direction with shifting in the [–a/3, b/3, c/3] direction. A three-dimensional framework structure of the layers is formed via B—Si bonds and {Si8} units of
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3

Petrova, V. A., V. V. Garbuz, V. B. Muratov, et al. "Specific surface, crystalite size of AlB12-nano of products of interaction "BN-Al" in vacuum." Surface 13(28) (December 30, 2021): 175–81. http://dx.doi.org/10.15407/surface.2021.13.175.

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Boron carbide (BC, B15-xCx B4C) has a unique combination of properties. This makes it a material for priority applications for a wide range of engineering solutions. The high melting point and heat resistance of the compound contribute to its use in refractory conditions. Due to its extreme abrasion resistance, B4C is used as an abrasive powder and coating. Due to its high hardness and low density, B15-xCx has ballistic characteristics. It is usually used in nuclear programs as an absorbent of neutron radiation Boron carbide ceramics (B15-xCx or BC) may lose strength and toughness due to the a
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4

McMillan, Paul F., Herve Hubert, and Andrew Chizmeshya. "Growth of Icosahedral Boron-Rich Clusters at High Pressure." MRS Proceedings 499 (1997). http://dx.doi.org/10.1557/proc-499-453.

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ABSTRACTThe stoichiometry of boron suboxide (B6O1-x) synthesized at high pressure lies closer to the nominal composition (x = 0) than materials obtained at atmospheric pressure. The crystallinity of materials obtained in the presence of molten B2O3 is also higher than for sintered powders. Further, for syntheses at 1700–1800 °C between 4 and approximately 5–6 GPa, the well-crystallized particles are dominated by large (up to ∼40 μm in diameter) icosahedral multiply-twinned particles. This unusual morphology is obtained by Mackay packing; i.e., by assembly of successive shells of icosahedral B1
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Dissertations / Theses on the topic "Icosahedral B12 units"

1

Karmodak, Naiwrit. "The Structural Chemistry of Boron, Borospherenes and Borophenes: A Computational Study." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5347.

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Structural complexity is one of the characteristics of boron chemistry. The 3D solids formed from icosahedral B12 units is thought of as most favorable arrangement for boron allotropes. However, recent discoveries in this area have extended these perceptions. The H atom removal from polyhedral boranes flattens the clusters. As a number of boron atoms increases, spherical borospherenes become competitive in stability to planar clusters. With further increase in boron content, consequences vary depending upon the synthetic techniques. Depending upon the metal templates, most stable forms are ext
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