An Example of Body-Centered Cubic Crystal Structure: The Atomium in Brussels as an Educative Tool for Introductory Materials Chemistry

2012 ◽  
Vol 89 (7) ◽  
pp. 921-924 ◽  
Author(s):  
Gabriel Pinto
Keyword(s):  
Crystal Structure ◽  
Materials Chemistry ◽  
Body Centered Cubic ◽  
Cubic Crystal

scholarly journals Generalization of intrinsic ductile-to-brittle criteria by Pugh and Pettifor for materials with a cubic crystal structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
O. N. Senkov ◽  
D. B. Miracle
Keyword(s):  
Crystal Structure ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Single Crystal ◽  
Elastic Constants ◽  
Mechanical Analysis ◽  
Quantum Mechanical ◽  
Modulus Ratio ◽  
Cubic Crystal ◽  
The Difference

AbstractTwo classical criteria, by Pugh and Pettifor, have been widely used by metallurgists to predict whether a material will be brittle or ductile. A phenomenological correlation by Pugh between metal brittleness and its shear modulus to bulk modulus ratio was established more than 60 years ago. Nearly four decades later Pettifor conducted a quantum mechanical analysis of bond hybridization in a series of intermetallics and derived a separate ductility criterion based on the difference between two single-crystal elastic constants, C12–C44. In this paper, we discover the link between these two criteria and show that they are identical for materials with cubic crystal structures.

Materials and Photosensor Devices with High Radiation Stability

2015 ◽  
Vol 1117 ◽  
pp. 107-113 ◽  
Author(s):  
Ilariy Rarenko ◽  
Dmytro Korbutyak ◽  
Volodymyr Koshkin ◽  
Boris Danilchenko ◽  
Leonid Kosyachenko ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Metal Layer ◽  
Chemical Properties ◽  
Radiation Stability ◽  
Reactor Irradiation ◽  
High Concentration ◽  
High Radiation ◽  
Cubic Crystal ◽  
Impurity Atoms ◽  
Mixed Reactor

Semiconductor Hg3In2Te6 crystals and their analogous are solid solutions of In2Te3 and HgTe. Hg3In2Te6 crystals are congruently melted as chemical compound. Like In2Te3 the Hg3In2Te6 crystal has cubic crystal lattice with stoichiometric vacancies in their crystal structure. The electroconductivity, photoconductivity, mechanical, chemical properties of the crystals do not deteriorate after their irradiation by γ-photons with energies up to 1 MeV and doses up to 1018 cm-2 , by electrons with energies up to 300 MeV and doses up to 1019 cm-2 and by mixed reactor irradiation (filtered slow neutrons) with doses up to 1019 cm-2 [1,2]. This feature is determined by high concentration (~1021 cm-3) of stoihiometric vacancies (Vs) in crystal structure, where every third In-cation node is empty. These Vs are electroneutral, they capture all impurity atoms in these crystals and kept them in electroneutral state too. On the other hand this feature doesn't allow to form direct p-n junctions in these crystals by introducing the impurities. However, we have developed p-n junction analogues in form of Schottki diodes and corresponding photodiodes with semitransparent metal layer on single crystal Hg3In2Te6 substrate that allows irradiation to get into active region preserving this way all the advantages compared to p-n junction.

Rapid Thermal Transformation of A-15 Crystal Structure Metallic Thin Films

1995 ◽  
Vol 387 ◽  
Author(s):  
M. J. O'Keefe ◽  
C. L. Cerny
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Physical Vapor Deposition ◽  
Thermal Transformation ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Body Center Cubic

AbstractPhysical vapor deposition of Group VI elements (Cr, Mo, W) can lead to the formation of a metastable A-15 crystal structure under certain processing conditions. Typically, a thermally induced transformation of the metastable A-15 structure into the equilibrium body centered cubic structure has been accomplished by conventional furnace annealing at T/Tm ≈ 0.3 from tens of minutes to several hours. In this study we report on the use of rapid thermal annealing to transform sputter deposited A- 15 crystal structure tungsten and chromium thin films into body centered cubic films within the same temperature range but at times on the order of one minute. The minimum annealing times and temperatures required for complete transformation of the A-15 phase into the BCC phase varied from sample to sample, indicating that the transformation was dependent on the film characteristics. The electrical resistivity of A-15 Cr and W films was measured before and after rapid thermal annealing and was found to significantly decrease after transformation into the body center cubic phase.

scholarly journals Роль упругих напряжений при формировании нитридных нитевидных нанокристаллов с кубической кристаллической структурой

2019 ◽  
Vol 45 (20) ◽  
pp. 39
Author(s):  
Н.В. Сибирев ◽  
Ю.С. Бердников ◽  
В.Н. Сибирев
Keyword(s):  
Crystal Structure ◽  
Elastic Strain ◽  
Theoretical Study ◽  
Crystal Phase ◽  
Cubic Crystal ◽  
Cubic Lattice ◽  
Gan Nanowires ◽  
Sapphire Substrates

In this work, a theoretical study of the growth of nitride nanowires with metastable cubic (zincblende) crystal structure is presented. The formation of cubic lattice is explained by accounting the elastic strain in the nucleus of a new layer within the nanowire. The growth of GaN nanowires with cubic crystal phase on sapphire substrates is described.

scholarly journals Descriptors for predicting the lattice constant of body centered cubic crystal

2017 ◽  
Vol 146 (20) ◽  
pp. 204104 ◽  
Author(s):  
Keisuke Takahashi ◽  
Lauren Takahashi ◽  
Jakub D. Baran ◽  
Yuzuru Tanaka
Keyword(s):  
Lattice Constant ◽  
Body Centered Cubic ◽  
Cubic Crystal

The Influence of the Synthesis Method on the Formation of Phase Composition and Catalytic Centers Gd2Zr2O7

2020 ◽  
Vol 1009 ◽  
pp. 69-74
Author(s):  
Ekaterina Borisovna Markova ◽  
Alexander Genrihovich Cherednichenko ◽  
V.V. Kurilkin ◽  
J.M. Serov
Keyword(s):  
Crystal Structure ◽  
Synthesis Method ◽  
Nanocrystalline Powders ◽  
Face Centered Cubic ◽  
Cubic Crystal ◽  
Wide Range ◽  
Physicochemical Methods ◽  
Degradation Reaction ◽  
Cubic Structure ◽  
Face Centered

The influence of the type of crystal structure of complex gadolinium oxides on their catalytic activity was studied using a wide range of physicochemical methods. It was shown that the synthesized nanocrystalline powders Gd2Zr2O7 form highly symmetric face-centered cubic crystal structures. In the course of catalytic experiments, it was found that the formation of a cubic structure increases the degree of conversion of propane and the shift of cracking temperatures to a lower area. The formation of various defects contributes to the course of the dehydrogenation or degradation reaction due to the different number of catalytic centers.

Electrodeposition of crystalline silicon directly from silicon tetrachloride in ionic liquid at low temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12061-12067 ◽  
Author(s):  
Junling Zhang ◽  
Shimou Chen ◽  
Haitao Zhang ◽  
Suojiang Zhang ◽  
Xue Yao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ionic Liquid ◽  
Low Temperature ◽  
Crystalline Silicon ◽  
Silicon Tetrachloride ◽  
Cubic Crystal

Crystalline silicon was fabricated directly from silicon tetrachloride in ionic liquid at low temperature of 100 °C. SEM, TEM and SEAD revealed that as-deposited crystalline Si with diamond cubic crystal structure.

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