Thermochemistry of inorganic solids. 9. A quantitative relation between the lattice enthalpy and the near-neighbor distance of cubic crystals

1989 ◽  
Vol 93 (8) ◽  
pp. 3308-3311 ◽  
Author(s):  
Mohamed W. M. Hisham ◽  
Sidney W. Benson
Keyword(s):  
Near Neighbor ◽  
Quantitative Relation ◽  
Neighbor Distance ◽  
Cubic Crystals ◽  
Inorganic Solids ◽  
Near Neighbor Distance

The effect of pressure on the near‐neighbor distance in water

1975 ◽  
Vol 63 (12) ◽  
pp. 5205-5207 ◽  
Author(s):  
E. Whalley
Keyword(s):  
Near Neighbor ◽  
Neighbor Distance ◽  
Effect Of Pressure ◽  
Near Neighbor Distance

In Situ X-Ray Scattering of Monolayers Adsorbed at Electrochemical Interfaces.

1988 ◽  
Vol 143 ◽  
Author(s):  
Michael F. Toney ◽  
Owen. R Melroy
Keyword(s):  
Near Neighbor ◽  
X Ray ◽  
X Ray Scattering ◽  
Electrochemical Interfaces ◽  
Ag Substrate ◽  
Near Neighbor Distance ◽  
Surface Diffraction ◽  
Good Agreement ◽  
Ray Scattering

AbstractSurface x-ray scattering has been used to study in-situ the structure of Pb monolayers electrochemically adsorbed on Ag (111) electrodes. Pb forms an incommensurate, hexagonal two-dimensional (2D) solid, which is rotated approximately 4.5° from the substrate symmetry directions and compressed relative to bulk Pb. Between monolayer formation and bulk deposition, the Pb-Pb near neighbor distance decreases linearly with applied potential. Due to the chemical equilibrium between the Pb monolayer and the Pb in solution, the isothermal compressibility of the monolayer can be measured and is in good agreement with that calculated for a 2D non-interacting free electron gas model of the monolayer. It is observed that the intensity of surface diffraction from the Ag substrate (the Ag crystal truncation rod) decreases when the Pb monolayer is adsorbed, although the cause of this is not known.

Formation of Metastable Structures and Amorphous Phases in cu-w Alloys Using the Triode Sputtering Technique

1988 ◽  
Vol 100 ◽  
Author(s):  
H. F. Rizzo ◽  
L. E. Tanner ◽  
M. A. Wall ◽  
T. B. Massalski ◽  
E. D. McClanahan
Keyword(s):  
Amorphous Alloys ◽  
Lattice Parameter ◽  
Near Neighbor ◽  
X Ray Diffraction ◽  
Amorphous Phases ◽  
Metastable Structures ◽  
Vegard’S Law ◽  
Wide Range ◽  
Bcc Phase ◽  
Near Neighbor Distance

ABSTRACTThe triode sputtering technique and a “split-target” arrangement were used to produce metastable crystalline and amorphous phases in the Cu-W system under essentially oxygen-free conditions. Large metastable extensions of solid solubility were observed both from the Cu (fcc) and W (bcc) sides of the phase diagram, and a wide range of metallic glass formation was observed, approximately between 30 and 65 at.% W. The thickness of the amorphous Cu-W phase (40–160 pm) that can be deposited without the formation of the metastable bcc phase appears to be dependent on the Cu-W alloy composition. On heating, the crystallization temperature of the amorphous alloys was higher than 350°C. The behavior of the lattice parameter and near-neighbor distance has been studied with x-ray diffraction, showing small positive deviations from an assumed Vegard's Law. Hardness measurements indicate that the metastable crystalline phases are relatively harder than the amorphous phase.

Measurement of the Displacement Across a Coincidence Grain Boundary

1977 ◽  
Vol 35 ◽  
pp. 124-125
Author(s):  
J. W. Matthews ◽  
W. M. Stobbs
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Stacking Fault ◽  
The Other ◽  
Measuring Technique ◽  
High Angle ◽  
Twin Boundaries ◽  
Rigid Displacement ◽  
Cubic Crystals ◽  
Lattice Displacement

Many high-angle grain boundaries in cubic crystals are thought to be either coincidence boundaries (1) or coincidence boundaries to which grain boundary dislocations have been added (1,2). Calculations of the arrangement of atoms inside coincidence boundaries suggest that the coincidence lattice will usually not be continuous across a coincidence boundary (3). There will usually be a rigid displacement of the lattice on one side of the boundary relative to that on the other. This displacement gives rise to a stacking fault in the coincidence lattice.Recently, Pond (4) and Smith (5) have measured the lattice displacement at coincidence boundaries in aluminum. We have developed (6) an alternative to the measuring technique used by them, and have used it to find two of the three components of the displacement at {112} lateral twin boundaries in gold. This paper describes our method and presents a brief account of the results we have obtained.

Microtwinning Evidence For The Apparent Five-Fold Symmetry in T2(Al6Li3Cu)

1987 ◽  
Vol 45 ◽  
pp. 24-25
Author(s):  
Kenneth S. Vecchio ◽  
David B. Williams
Keyword(s):  
Stable Equilibrium ◽  
Equilibrium Phase ◽  
Convergent Beam Electron Diffraction ◽  
Icosahedral Structure ◽  
Cubic Crystals ◽  
Icosahedral Phases ◽  
Heat Treated ◽  
Zero Layer ◽  
Convergent Beam ◽  
Zr Alloy

Since the discovery in 1984 by Shechtman et al. of crystals which display apparent five-fold symmetry, extensive effort has been given to establishing a theoretical basis for the existence of icosahedral phases (eg.2.). Several other investigations have been centered on explaining these observations based on twinning of cubic crystals (eg.3.). Recently, the existence of a stable, equilibrium phase T2Al6 Li3Cu) possessing an icosahedral structure has been reported in the Al-Li-Cu system(4-6).In the present study an Al-2.6wt.%Li-l.5wt.%Cu-0.lwt.%Zr alloy was heat treated at 300°C for 100hrs. to produce large T2 precipitates. Convergent Beam Electron Diffraction (CBED) patterns were obtained from two-fold, three-fold, and apparent five-fold axes of T2 particles. Figure 1 shows the five-fold symmetric zero layer CBED pattern obtained from T2 particles.

NEAR-NEIGHBOR DEFECT CONTRIBUTION TO THE HYPERFINE FIELD OF Fe IN Fe

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-61-C8-62
Author(s):  
Ch. Stenzel ◽  
J. Das ◽  
T. Lauritsen ◽  
J. Schecker ◽  
G. D. Sprouse ◽  
...  
Keyword(s):  
Hyperfine Field ◽  
Near Neighbor

QUANTITATIVE RELATION BETWEEN CONFLICT AND RESPONSE INHIBITION IN THE FLANKER TASK

2005 ◽  
Vol 97 (6) ◽  
pp. 515 ◽  
Author(s):  
TOMOHIRO TAKEZAWA
Keyword(s):  
Response Inhibition ◽  
Flanker Task ◽  
Quantitative Relation

MISORIENTATION DISTRIBUTION FUNCTION FOR CUBIC CRYSTALS

2019 ◽  
Vol 85 (5) ◽  
pp. 28-32
Author(s):  
A. S. Kolyanova ◽  
Y. N. Yaltsev
Keyword(s):  
Distribution Function ◽  
Grain Boundaries ◽  
Orientation Distribution ◽  
Recrystallization Annealing ◽  
Misorientation Distribution ◽  
Cubic Crystals ◽  
Special Boundaries ◽  
Pole Figures ◽  
Two Samples ◽  
Euler Space

A calculation method for obtaining the misorientation distribution function (MDF) for cubic crystals which can be used to estimate the presence or absence of special boundaries in the materials is presented. The calculation was carried out for two samples of Al-Mg-Si alloy subjected to various mechanical and thermal treatments: the first sample is subjected to rolling; the second sample is subjected to recrystallization annealing. MDF is calculated for each sample; the results are presented in the Euler space and in the angle-axis space. The novelty of the method consists in the possibility of gaining data on the grain boundaries from X-ray texture analysis without using electron microscopy. A calculation involving only mathematical operations on matrices was performed on the basis of the orientation distribution function restored from incomplete pole figures. It is shown that no special boundaries are observed in the deformed sample, whereas in the recrystallized alloy, special boundaries are detected at Ʃ = 23, 13, and 17. The shortcoming of the proposed method can be attributed to the lack of accurate data on grain boundaries, since all possible orientation in the polycrystal should be taken into account in MDF calculation.

Bio-Nanohybrids Based on Layered Inorganic Solids: Gelatin Nanocomposites

2006 ◽  
Vol 2 (3) ◽  
pp. 231-241 ◽  
Author(s):  
Margarita Darder ◽  
Ana Isabel Ruiz ◽  
Pilar Aranda ◽  
Henri Van Damme ◽  
Eduardo Ruiz-Hitzky
Keyword(s):  
Inorganic Solids
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