Cu–Zr and Cu–Zr–Al clusters: Bonding characteristics and mechanical properties

2010 ◽  
Vol 504 ◽  
pp. S190-S193 ◽  
Author(s):  
Ch.E. Lekka
Keyword(s):  
Mechanical Properties ◽  
Bonding Characteristics

scholarly journals Effects of Nitrogen Flow Ratio on Structures, Bonding Characteristics, and Mechanical Properties of ZrNx Films

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 476 ◽  
Author(s):  
Yi-En Ke ◽  
Yung-I Chen
Keyword(s):  
Mechanical Properties ◽  
Photoelectron Spectroscopy ◽  
Structural Variation ◽  
Nitrogen Flow ◽  
Flow Ratio ◽  
X Ray ◽  
Direct Current Magnetron Sputtering ◽  
Nanoindentation Hardness ◽  
Bonding Characteristics ◽  
Dominant Phase

ZrNx (x = 0.67–1.38) films were fabricated through direct current magnetron sputtering by a varying nitrogen flow ratio [N2/(Ar + N2)] ranging from 0.4 to 1.0. The structural variation, bonding characteristics, and mechanical properties of the ZrNx films were investigated. The results indicated that the structure of the films prepared using a nitrogen flow ratio of 0.4 exhibited a crystalline cubic ZrN phase. The phase gradually changed to a mixture of crystalline ZrN and orthorhombic Zr3N4 followed by a Zr3N4 dominant phase as the N2 flow ratio increased up to >0.5 and >0.85, respectively. The bonding characteristics of the ZrNx films comprising Zr–N bonds of ZrN and Zr3N4 compounds were examined by X-ray photoelectron spectroscopy and were well correlated with the structural variation. With the formation of orthorhombic Zr3N4, the nanoindentation hardness and Young’s modulus levels of the ZrNx (x = 0.92–1.38) films exhibited insignificant variations ranging from 18.3 to 19.0 GPa and from 210 to 234 GPa, respectively.

Mechanical properties and chemical bonding characteristics of WC and W2C compounds

2014 ◽  
Vol 40 (2) ◽  
pp. 2891-2899 ◽  
Author(s):  
YangZhen Liu ◽  
YeHua Jiang ◽  
Rong Zhou ◽  
Jing Feng
Keyword(s):  
Mechanical Properties ◽  
Chemical Bonding ◽  
Bonding Characteristics

Mechanical properties and chemical bonding characteristics of Cr7C3 type multicomponent carbides

2011 ◽  
Vol 109 (2) ◽  
pp. 023507 ◽  
Author(s):  
B. Xiao ◽  
J. Feng ◽  
C. T. Zhou ◽  
Y. H. Jiang ◽  
R. Zhou
Keyword(s):  
Mechanical Properties ◽  
Chemical Bonding ◽  
Bonding Characteristics

Electronic Structure and Bonding in YTi2Ga4 – A Gallide with Linear Titanium Chains and Four-bonded Gallium Atoms

2013 ◽  
Vol 68 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Samir F. Matar ◽  
Rainer Pöttgen
Keyword(s):  
Mechanical Properties ◽  
Electronic Structure ◽  
Three Dimensional ◽  
Itinerant Electron ◽  
Large Cage ◽  
Metallic Behavior ◽  
Structure And Bonding ◽  
Ternary Intermetallic Compound ◽  
Bonding Characteristics ◽  
Charge Partitioning

The gallium-rich ternary intermetallic compound YTi2Ga4 is isotypic with YbMo2Al4, I4/mmm, Z =2. Yttrium is located in a large cage built up by 12 gallium atoms. Chains of condensed Y@Ga12 polyhedra and linear titanium chains build up a tetragonal rod packing. The gallium atoms are bonded within Ga4 squares (265 pm Ga-Ga) which are condensed via longer Ga-Ga bonds (292 pm) to a three-dimensional gallium substructure with formally four-connected gallium, in agreement with a Bader charge partitioning scheme [YTi2]4+[Ga4]4-. These features are addressed with electronic structure and chemical bonding considerations. The metallic behavior of YTi2Ga4 is found to be of the itinerant electron type within the valence band and Ti d-like states at EF. Ga-Ga and Ti-Ga bonding characteristics provide mechanical properties derived from the full set of elastic constants leading to a brittle material.

scholarly journals Fabrication and Characterization of Woven and Non-woven Textiles Derived from Natural Resources

2021 ◽  
Vol 12 (2) ◽  
pp. 1814-1823
Keyword(s):  
Mechanical Properties ◽  
Textile Industry ◽  
Physical And Mechanical Properties ◽  
Xrd Analysis ◽  
Empty Fruit Bunches ◽  
Chemical Treatments ◽  
Fabrication And Characterization ◽  
Long Fibers ◽  
Bonding Characteristics

The present work investigated the properties of long fibers derived from oil palm empty fruit bunches (OPEFB) for the potential woven and non-woven textiles production. Several characterizations such as XRD, FTIR, SEM-EDX, DSC, and mechanical testing were carried out to understand the properties comprehensively. This study found that the OPEFB has the potential for the production of woven and non-woven textiles. The properties of OPEFB fibers were comparable with synthetics fibers that are commonly used in the textile industry. XRD analysis confirmed the structural properties, while the FTIR showed the biomolecules' bonding characteristics. In general, the physical and mechanical properties of the OPEFB fibers depend on surface modification and chemical treatments.

Mechanical properties, bonding characteristics, and oxidation behaviors of Nb–Si–N coatings

2018 ◽  
Vol 350 ◽  
pp. 831-840 ◽  
Author(s):  
Yung-I Chen ◽  
Yu-Xiang Gao ◽  
Li-Chun Chang ◽  
Yi-En Ke ◽  
Bo-Wei Liu
Keyword(s):  
Mechanical Properties ◽  
Bonding Characteristics ◽  
Oxidation Behaviors

The Effect of Ca(OH)2-Treated Ceramic Microspheres on the Mechanical Properties of High-Temperature Lightweight Cement Compos

1987 ◽  
Vol 114 ◽  
Author(s):  
Toshifumi Sugama
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Temperature ◽  
Bulk Density ◽  
Calcium Hydroxide ◽  
Epitaxial Layer ◽  
Water Permeability ◽  
Essential Role ◽  
Cement Matrix ◽  
Bonding Characteristics

ABSTRACTThe compressive strength and water permeability of high-temperature lightweight cementing materials containing sillimanite-based hollow microspheres as a filler can be improved by treating the surfaces of the microspheres with a Ca(OH)2-saturated solution at temperatures up to 200°C. The precipitation of an epitaxial layer formed by an interaction between a hot calcium hydroxide solution and the surface of the sphere plays an essential role in developing favorable bonding characteristics at the interfaces and in promoting the hydration of the cement matrix. The properties of the composites include a slurry density of <1.2 g/cc at 25°C, a 300°C-24 hour compressive strength of >1015 psi (7.0 MPa), a water permeability of <10-4 Darcy, and a bulk density of <1.0 g/cc. It was observed that tobermoritetruscottite transformation and anorthite formation during autoclave exposure for 180 days in brine at 300°C results in slight strength reductions and increased water permeability.

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