Carbon tetrachloride. Determination of the enthalpy of transition from metastable face-centered cubic carbon tetrachloride to the stable rhombohedral modification

1972 ◽  
Vol 4 (5) ◽  
pp. 789-791 ◽  
Author(s):  
J.G Arentsen ◽  
J.C Van Miltenburg
Keyword(s):  
Carbon Tetrachloride ◽  
Face Centered Cubic ◽  
Enthalpy Of Transition ◽  
Face Centered

Experimental Determination of Dissolution Kinetics of Zr-Substituted Gd-Ti Pyrochlore Ceramics: Influence of Chemistry on Corrosion Resistance

2002 ◽  
Vol 757 ◽  
Author(s):  
Icenhower J.P. ◽  
Weber W.J. ◽  
Hess N.J. ◽  
Thevuthasen S. ◽  
Begg B.D. ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Dissolution Kinetics ◽  
Fluorite Structure ◽  
Annealed Specimen ◽  
Face Centered Cubic ◽  
Zirconium Content ◽  
The Face ◽  
Flow Through ◽  
Face Centered

ABSTRACTThe corrosion resistance of a series of zirconium-substituted gadolinium pyrochlore, Gd2(Ti1-x Zrx)2O7, where x = 0.0, 0.25, 0.50, 0.75, and 1.00, were evaluated using single-pass flow-through (SPFT) apparatus at 90°C and pH = 2. The zirconate end-member, Gd2Zr2O7, has a defect fluorite structure, which distinguishes it from the face-centered cubic structure of the true pyrochlore specimens. In addition to the chemical variation, the samples include annealed, un-annealed, and ion-bombarded monoliths. In the case of the titanate end-member, Gd2Ti2O7, the annealed specimen exhibited the least reactivity, followed by the un-annealed and ion-bombarded samples (2.39×10-3, 1.57×10-2, and 1.12×10-1 g m-2 d-1, respectively). With increasing zirconium content, the samples displayed less sensitivity to processing or surface modification with the zirconate end-member exhibiting no difference in reactivity between annealed, un-annealed, and ion-bombarded specimens (rate = 4.0×10-3 g m-2 d-1). In all cases, the dissolution rate decreased with increasing zirconium content to the Gd2(Ti0.25Zr0.75)2O7 composition (1.33x10-4 g m-2 d-1), but the zirconate end-member yielded rates nearly equal to that of the titanate end-member. These results demonstrate that to achieve the greatest radiation and corrosion resistance in this series, the Gd2(Ti0.25Zr0.75)2O7 composition should be considered.

The determination of solute atom displacements in mixed dumbbell interstitials for the face-centered-cubic lattice

1978 ◽  
Vol 56 (8) ◽  
pp. 1057-1070 ◽  
Author(s):  
N. Matsunami ◽  
M. L. Swanson ◽  
L. M. Howe
Keyword(s):  
Solute Atom ◽  
The Body ◽  
Continuum Approximation ◽  
Face Centered Cubic ◽  
Cubic Lattice ◽  
The Face ◽  
Solute Atoms ◽  
Face Centered ◽  
Small Solute

Interactions between irradiation-produced defects and solute atoms in metals have been investigated using the channeling technique. The interaction of interest in this investigation is the trapping of self interstitials by small solute atoms thus creating a [Formula: see text] mixed dumbbell, consisting of a host atom and a solute atom straddling a lattice site in the face-centered-cubic lattice. The displacement of solute atoms from lattice sites in the mixed dumbbell configuration was determined by comparing the experimentally observed normalized yields from solute atoms and from host atoms with the yields calculated analytically using the continuum approximation. The solute atoms in Al–Mn, Al–Cu, and Cu–Be mixed dumbbells were situated at 0.5 Å from the body-centered position, whereas the Ag atoms in Al–Ag dumbbells were 0.7 Å from this position. This result is consistent with the theoretical expectation that the smallest solute atoms are displaced the greatest amount in mixed dumbbells. In addition, experimentally obtained solute atom yields for [Formula: see text] and [Formula: see text] angular scans were compared with calculated scans. It was concluded that for large displacements of solute atoms into the flux peaking region, the analytical (continuum) calculation is a reliable method of determining solute atom displacements, either from the aligned yields or from the angular scans.

Morphological determination of face-centered-cubic metallic nanoparticles by X-ray diffraction

2012 ◽  
Vol 369 (1) ◽  
pp. 129-133 ◽  
Author(s):  
Chi-Feng Lee ◽  
Chia-Lun Chang ◽  
Jing-Cyuan Yang ◽  
Hsiang-Yu Lai ◽  
Chun-Hua Chen
Keyword(s):  
Metallic Nanoparticles ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Face Centered

scholarly journals Deformation pathway and defect generation in crystals: a combined group theory and graph theory description

IUCrJ ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 96-104 ◽  
Author(s):  
Yipeng Gao ◽  
Yunzhi Wang ◽  
Yongfeng Zhang
Keyword(s):  
Plastic Deformation ◽  
Graph Theory ◽  
Group Theory ◽  
Symmetry Breaking ◽  
Mathematical Framework ◽  
Face Centered Cubic ◽  
Systematic Determination ◽  
Face Centered ◽  
Pathway Graph

The generation and motion of crystalline defects during plastic deformation are critical processes that determine the mechanical properties of a crystal. The types of defect generated are not only related to the symmetry of a crystal but also associated with the symmetry-breaking process during deformation. Proposed here is a new mathematical framework to capture the intrinsic coupling between crystal symmetry and deformation-induced symmetry breaking. Using a combination of group theory and graph theory, a general approach is demonstrated for the systematic determination of the types of crystalline defect induced by plastic deformation, through the construction of a crystal deformation group and a deformation pathway graph. The types of defect generated in the deformation of a face-centered cubic crystal are analyzed through the deformation pathway graph and compared with experimental observations.

Determination of Texture Orientation Related Magnetic Properties of Nickel-Cobalt Films

2010 ◽  
Vol 65 (4) ◽  
pp. 342-346 ◽  
Author(s):  
Mehmet Bayirli ◽  
Hakan Kockar ◽  
Mursel Alper ◽  
Emrah Cokturen
Keyword(s):  
Easy Axis ◽  
Hysteresis Loops ◽  
Face Centered Cubic ◽  
Axis Orientation ◽  
X Ray ◽  
A Value ◽  
Nickel Cobalt ◽  
Magnetic Easy Axis ◽  
Face Centered

The determination of texture effects in nickel-cobalt (Ni-Co) films with different thickness, which were obtained by electrodeposition, has been investigated by the measurement of hysteresis loops at different angles. Easy-axis distribution measurements were performed as a function of the squareness Mp(β ) and the correlations were established among the different thicknesses. The composition of Ni- Co films was determined by energy dispersive X-ray spectroscopy. The structural analysis made by X-ray diffraction revealed that all films have a polycrystalline face-centered cubic structure but their texture degrees vary depending on the film thickness. The determination of the easy-axis orientation in 2-D films from the Mp(β ) obtained by the hystersis loops was studied using Fourier series analyses. The coefficient A0 have a value of less then unity while A2 is inversely proportional to the width of the distribution function which may cause the change in the texture preferential orientations. Therefore, the differences observed in the magnetic easy-axis distributions were attributed to the changes in texture orientations caused by the compositional differences at different thicknesses of the polycrystalline films.

Determination of the Néel Temperature of Face-Centered-Cubic Iron

1970 ◽  
Vol 1 (7) ◽  
pp. 3208-3208 ◽  
Author(s):  
G. J. Johanson ◽  
M. B. McGirr ◽  
D. A. Wheeler
Keyword(s):  
Face Centered Cubic ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Face Centered

Compression of CCl4 at High Pressures

1983 ◽  
Vol 22 ◽  
Author(s):  
Sharrill D. Wood ◽  
Vern E. Bean
Keyword(s):  
Carbon Tetrachloride ◽  
Phase Change ◽  
Pressure Range ◽  
High Pressures ◽  
Rhombohedral Phase ◽  
Face Centered Cubic ◽  
Volume Changes ◽  
Capacitance Bridge ◽  
Face Centered ◽  
Fcc Phase

ABSTRACTThe compression of carbon tetrachloride has been measured along twelve isotherms covering a pressure range of 0.1 to 200 MPa and a temperature range of 254 to 298 K. Volume changes were measured with an automated capacitance bridge–one side of the bellows containing the sample serving as one plate of the capacitor. Data were obtained in the liquid, face-centered cubic (fcc), and rhombohedral phases, during melting, during freezing into the fcc phase and during the fcc to rhombohedral phase change. Premelting behavior was observed for both solids. The disappearance of the fcc phase at approximately 273 K and the existence of dual melting curves for the fcc and rhombohedral phases were reaffirmed.

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