Brillouin scattering and x-ray diffraction of solid argon to 65 GPa and 700 K: Shear strength of argon at HP/HT

2013 ◽  
Vol 114 (9) ◽  
pp. 093517 ◽  
Author(s):  
H. Marquardt ◽  
S. Speziale ◽  
A. Gleason ◽  
S. Sinogeikin ◽  
I. Kantor ◽  
...  
Keyword(s):  
Shear Strength ◽  
Brillouin Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid Argon

X-Ray Diffraction by Compressed Solid Argon

1973 ◽  
Vol 51 (1) ◽  
pp. 25-35 ◽  
Author(s):  
P. M. Bronsveld ◽  
S. K. Kumra ◽  
J. C. Stryland
Keyword(s):  
Triple Point ◽  
Pressure Vessel ◽  
Coefficient Of Thermal Expansion ◽  
Volume Density ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rotation Method ◽  
Solid Argon ◽  
Oscillation Method

A technique is described to perform precision measurements of the lattice parameter of solid argon under pressure. Details are given of the apparatus which consists of a beryllium pressure vessel, a liquid nitrogen cryostat, a two-circle goniometer, and a cylindrical camera. Small argon crystals are grown in the pressure vessel and one suitable crystal is selected and correctly oriented with a precision of 1 min of arc, using the oscillation method. The single-crystal rotation method is used to measure the lattice parameter with an estimated precision of 0.01%. Measurements were carried out along the melting line in the range from the triple point (83.8 K and 0.7 bar) to 95 K and 450 bar. The result obtained for the lattice parameter of solid argon near the triple point, a0 = 5.4676 ± 0.0005 Å, is in close agreement with the low pressure result of Peterson et al. Some values are calculated for the molar volume, density, coefficient of thermal expansion, and bulk modulus of solid argon, and these results are compared with those obtained by other workers using different methods.

Brillouin scattering near the α–β phase transitions of N2 and CO

1988 ◽  
Vol 66 (4) ◽  
pp. 541-548 ◽  
Author(s):  
V. Askarpour ◽  
H. Klefte ◽  
M. J. Clouter
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Α Phase ◽  
Mode Softening ◽  
Cubic Structure

The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of single crystals of β-N2 and β-CO as a function of temperature, in an effort to study the α–β phase transition. For all elastic constants, there is an increase of approximately 1%/K on cooling and there is no evidence of further mode softening, even within 0.5 K of the phase transition. Three large single crystals of α-CO were grown. The orientations were determined, by Laue X-ray diffraction, and correlated to the orientations of the parent β-crystals. The β-phase hexagonal basal planes appear to transform to planes of the form {110} in the α-phase cubic structure.

Elastic and nanostructural properties of Cu/Pd superlattices

1992 ◽  
Vol 7 (6) ◽  
pp. 1356-1369 ◽  
Author(s):  
B.M. Davis ◽  
D.X. Li ◽  
D.N. Seidman ◽  
J.B. Ketterson ◽  
R. Bhadra ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Brillouin Scattering ◽  
High Resolution Electron Microscopy ◽  
Anomalous Behavior ◽  
Electron Beam Evaporation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composition Modulation ◽  
Tension Tests ◽  
Resolution Electron

A series of Cu/Pd superlattices with composition modulation wavelengths (Λ's) ranging from 1.6 to 3.5 nm and a strong [111] growth texture were prepared by electron beam evaporation. The elastic properties of the films were examined using the methods of uniaxial tension tests [a Young's modulus (1/s11), where sij is an elastic compliance] with the applied load parallel to the plane of the Cu/Pd interface and Brillouin scattering [a shear modulus (1/s44) with the shear waves parallel to the plane of the Cu/Pd interface]. Also, the films were characterized using both x-ray diffraction and high-resolution electron microscopy; this was done to assess the effect of the nanostructure on a possible “supermodulus effect.” The films are nanostructurally very similar to the superlattice films employed in previous studies at Northwestern in which a supermodulus effect was reported. But, contrary to previous studies, no anomalous behavior was observed for the measured elastic properties of the thin films. Therefore the present results negate the earlier results and cast a serious doubt on the existence of a supermodulus effect.

Brillouin scattering, DSC, dielectric and X-ray diffraction studies of phase transitions in antiferroelectric PbHfO3:Sn

2015 ◽  
Vol 622 ◽  
pp. 935-941 ◽  
Author(s):  
Mirosław Mączka ◽  
Tae Hyun Kim ◽  
Anna Gągor ◽  
Irena Jankowska-Sumara ◽  
Andrzej Majchrowski ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Brillouin Scattering ◽  
X Ray Diffraction ◽  
X Ray

Mechanical Properties of Fly Ash-Slag-Dredged Silt System Stimulated by Alkali

2013 ◽  
Vol 807-809 ◽  
pp. 1140-1146 ◽  
Author(s):  
Yi Xuan Chen ◽  
Xiu Li Sun ◽  
Zhi Hua Li
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Fly Ash ◽  
Construction Materials ◽  
Xrd Analysis ◽  
Test Results ◽  
X Ray Diffraction ◽  
Shear Tests ◽  
X Ray ◽  
Direct Shear Tests

The objective of this work is to investigate the stimulation effect of the addition of alkali on the fly ash and slag for stabilizing dredged silt. Based on the test results, a viable alternative for the final disposal of dredged silt as subgrade construction materials were proposed. For this purpose, several mixtures of dredged silt-fly ash-slag and alkali were prepared and stabilized/solidified. In this system, fly ash and slag were used as hardening agents (solidified materials) of dredged silt and alkali was used as activator of fly ash and slag. The shear strength of the mixture was tested by several direct shear tests. Furthermore, X-Ray Diffraction (XRD) analysis was used to determine the hydration products of the system. The specimens were tested in order to determine the shear strength changes versus hydration time and the alkali content. It is indicated that mechanical properties of solidified silt are improved significantly by addition of fly ash and slag stimulated by alkali.

Brillouin scattering and X-ray diffraction of San Carlos olivine: direct pressure determination to 32 GPa

1998 ◽  
Vol 159 (1-2) ◽  
pp. 25-33 ◽  
Author(s):  
Chang-sheng Zha ◽  
Thomas S Duffy ◽  
Robert T Downs ◽  
Ho-kwang Mao ◽  
Russell J Hemley
Keyword(s):  
Brillouin Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
San Carlos Olivine ◽  
Direct Pressure ◽  
San Carlos

scholarly journals Elasticity, shear strength, and equation of state of molybdenum and gold from x-ray diffraction under nonhydrostatic compression to 24 GPa

1999 ◽  
Vol 86 (12) ◽  
pp. 6729-6736 ◽  
Author(s):  
Thomas S. Duffy ◽  
Guoyin Shen ◽  
Jinfu Shu ◽  
Ho-Kwang Mao ◽  
Russell J. Hemley ◽  
...  
Keyword(s):  
Shear Strength ◽  
Equation Of State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nonhydrostatic Compression

scholarly journals Characterization and brazing of sintered Ni-Al-Co powder mixtures containing intermetallics

2013 ◽  
Vol 20 (3) ◽  
pp. 245-253 ◽  
Author(s):  
İsmail Yildiz ◽  
Ayhan Erol ◽  
Ahmet Yönetken
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Shear Strength ◽  
Filler Alloy ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Tube Furnaces ◽  
Brazed Joints ◽  
Scanning Electron

AbstractPowder metallurgy is a progressive branch of engineering that enables engineers to fabricate difficult-to-make parts and materials that are used in many industrial areas. Joining this class of materials is a difficult task due to their intrinsic limitations, such as porosity and thermal properties. In this study, varying ratios of Co powder additions to Nix+Aly powder mixture were made prior to sintering at 600°C. The sintered samples were brazed in both microwave and traditional tube furnaces by placing brazing filler alloy between the sintered specimens without added weight at 950°C for 15 min. Scanning electron microscopy and X-ray diffraction techniques were employed to characterize the brazed samples and the joints. Shear strength and hardness of brazed joints were also determined.

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