Effects of Variable Boron Concentration on the Properties of Superhard Tungsten Tetraboride

2017 ◽  
Vol 139 (47) ◽  
pp. 17120-17127 ◽  
Author(s):  
Georgiy Akopov ◽  
Inwhan Roh ◽  
Zachary C. Sobell ◽  
Michael T. Yeung ◽  
Lisa Pangilinan ◽  
...  
Keyword(s):  
Boron Concentration ◽  
Tungsten Tetraboride

scholarly journals Boron Concentration Induced Co-Ta-B Composite Formation Observed in the Transition from Metallic to Covalent Glasses

2020 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Simon Evertz ◽  
Stephan Prünte ◽  
Lena Patterer ◽  
Amalraj Marshal ◽  
Damian M. Holzapfel ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Metallic Glasses ◽  
Boron Concentration ◽  
High Strength ◽  
Point Of View ◽  
Composite Formation ◽  
Structural Applications ◽  
Glassy Materials ◽  
Metallic Bonding ◽  
Composite Region

Due to their unique property combination of high strength and toughness, metallic glasses are promising materials for structural applications. As the behaviour of metallic glasses depends on the electronic structure which in turn is defined by chemical composition, we systematically investigate the influence of B concentration on glass transition, topology, magnetism, and bonding for B concentrations x = 2 to 92 at.% in the (Co6.8±3.9Ta)100−xBx system. From an electronic structure and coordination point of view, the B concentration range is divided into three regions: Below 39 ± 5 at.% B, the material is a metallic glass due to the dominance of metallic bonds. Above 69 ± 6 at.%, the presence of an icosahedra-like B network is observed. As the B concentration is increased above 39 ± 5 at.%, the B network evolves while the metallic coordination of the material decreases until the B concentration of 67 ± 5 at.% is reached. Hence, a composite is formed. It is evident that, based on the B concentration, the ratio of metallic bonding to icosahedral bonding in the composite can be controlled. It is proposed that, by tuning the coordination in the composite region, glassy materials with defined plasticity and processability can be designed.

Low-compressibility of tungsten tetraboride: a high pressure X-ray diffraction study

2011 ◽  
Vol 31 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Chenji Liu ◽  
Fang Peng ◽  
Ning Tan ◽  
Jing Liu ◽  
Fengjiao Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tungsten Tetraboride

Influence of Temperature on Boron Concentration in SiGe-B Epitaxy

2019 ◽  
Vol 3 (7) ◽  
pp. 211-213
Author(s):  
Yiyang Zhou ◽  
James A. Reindhardt ◽  
Glen E. Martin ◽  
Selene D. Dominguez ◽  
Raymond D. Carey
Keyword(s):  
Boron Concentration ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Radial x-ray diffraction of tungsten tetraboride to 86 GPa under nonhydrostatic compression

2013 ◽  
Vol 113 (3) ◽  
pp. 033507 ◽  
Author(s):  
Lun Xiong ◽  
Jing Liu ◽  
Ligang Bai ◽  
Yanchun Li ◽  
Chuanlong Lin ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Tungsten Tetraboride ◽  
Nonhydrostatic Compression

scholarly journals Boron nutrition and yield of alfalfa cultivar crioula in relation to boron supply

2004 ◽  
Vol 61 (5) ◽  
pp. 496-500 ◽  
Author(s):  
Anacleto Ranulfo dos Santos ◽  
Waldssimiler Teixeira de Mattos ◽  
Ana Aparecida da Silva Almeida ◽  
Francisco Antonio Monteiro ◽  
Beatriz Dias Corrêa ◽  
...  
Keyword(s):  
Dry Matter ◽  
Boron Concentration ◽  
Critical Level ◽  
External Solution ◽  
Dry Mass ◽  
Dry Matter Accumulation ◽  
Critical Levels ◽  
Production And Distribution ◽  
Plant Data ◽  
South Brazil

Alfalfa cultivar Crioula (Medicago sativa cv. Crioula) is grown in South Brazil and only a few studies on the plants' boron requirement are available. A greenhouse experiment was carried out with alfalfa to measure boron acquisition, production and distribution in the plant; data on critical level and production potentials were recorded. Plants were grown in ground quartz added with 1 L of solution, with the following boron rates: 0, 0.0625, 0.125, 0.25, 0.50, 1.00, and 2.00 mg L-1. Plants were harvested at 46 days of growth. Forage dry mass was increased by boron supply and dry matter accumulation was considerably low in control. Boron concentration in the leaves was higher than in the stems or roots. Boron utilization from the external solution reached 90% at 0.0625 mg L-1 and sharply decreased with further increasing boron rates. Boron concentration and content in the leaves and in plant tops were at maximum when applied boron was between 1.5 and 1.6 mg L-1. Critical levels of boron in plant were 61 mg kg-1 in the leaves and 39 mg kg-1 in plant tops for this cultivar of alfalfa.

scholarly journals Surface proximity and boron concentration effects on end-of-range defect formation during nonmelt laser annealing

2008 ◽  
Vol 92 (8) ◽  
pp. 082109 ◽  
Author(s):  
J. A. Sharp ◽  
A. J. Smith ◽  
R. P. Webb ◽  
K. J. Kirkby ◽  
N. E. B. Cowern ◽  
...  
Keyword(s):  
Laser Annealing ◽  
Boron Concentration ◽  
Defect Formation ◽  
Concentration Effects ◽  
Surface Proximity

scholarly journals Practical calculation method to estimate the absolute boron concentration in tissues using 18F-FBPA PET

2017 ◽  
Vol 31 (6) ◽  
pp. 481-485 ◽  
Author(s):  
Tadashi Watabe ◽  
Kohei Hanaoka ◽  
Sadahiro Naka ◽  
Yasukazu Kanai ◽  
Hayato Ikeda ◽  
...  
Keyword(s):  
Calculation Method ◽  
Boron Concentration ◽  
Practical Calculation ◽  
The Absolute

scholarly journals Five thousand years of bellyaches: Exploring boron concentration in ancient populations of the Atacama Desert

2020 ◽  
Author(s):  
Bernardo Arriaza ◽  
David Blumenstiel ◽  
Dulasiri Amarasiriwardena ◽  
Vivien G. Standen ◽  
Arnoldo Vizcarra
Keyword(s):  
Boron Concentration ◽  
Atacama Desert
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