scholarly journals X-Ray Line Broadening Studies on Aluminum Nitride, Titanium Carbide and Titanium Diboride Modified by High Pressure Shock Loading

1983 ◽  
Vol 24 ◽  
Author(s):  
B. Morosin ◽  
R. A. Graham
Keyword(s):  
High Pressure ◽  
Shock Loading ◽  
Lattice Strain ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Pressure Shock ◽  
X Ray ◽  
Simplified Method ◽  
Post Shock ◽  
Peak Pressures

ABSTRACTPowders of AlN, TiC and TiB2 have been subjected to controlled shock loading with peak pressures in the samples between 14 to 27 GPa and preserved for post-shock study. Broadened x-ray diffraction peak profiles are analyzed by a simplified method and show increases in residual lattice strain and small decreases in crystallite size. Strain values range from 10−5 to 10−4 for TiB2 and to values larger than 10−3 for TiC and AlN.

Line Broadening Studies on Highly Defective TiO2 Produced by High Pressure Shock Loading

1983 ◽  
Vol 27 ◽  
pp. 379-388
Author(s):  
B. Morosin ◽  
E. J. Graeber ◽  
R. A. Graham
Keyword(s):  
High Pressure ◽  
Catalytic Activity ◽  
Crystallite Size ◽  
Shock Loading ◽  
Lattice Strain ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Pressure Shock ◽  
X Ray ◽  
Large Numbers

Enhanced solid state reactivity of materials both during and after shock compression has been attributed to the introduction of large numbers of defects into the crystalline lattices and to reduction in the particle and crystallite size of powders [1]. In particular, orders of magnitude increases in the catalytic activity has been observed In shock-modified TiO2 [2]. Line broadening of x-ray diffraction profiles provides a means to determine the coherent crystallite size and the residual lattice strain resulting from defect concentrations. The present study on shock-loaded rutile is a detailed Investigation of the influence of shock loading on residual lattice strain and coherent crystallite size. Annealing of shock-modified rutile powders is also studied.

X-Ray Line Broadening Study on Shock-Modified Hematite

1987 ◽  
Vol 31 ◽  
pp. 287-294 ◽  
Author(s):  
Y. Zhang ◽  
J. M. Stewart ◽  
B. Morosin ◽  
R. A. Graham ◽  
C. R. Hubbard
Keyword(s):  
Shock Loading ◽  
Lattice Strain ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Pressure Shock ◽  
X Ray ◽  
Shock Temperature ◽  
Crystallite Sizes ◽  
Powder Compacts ◽  
Peak Pressures

AbstractHematite (α-Fe2O3) powder compacts have been subjected to controlled, quantitative high pressure shock loading at peak pressures from 8-27 GPa and preserved for post shook analysis. The broadened x-ray diffraction peak profiles have been analyzed to determine the residual lattice strain and the coherent crystallite sizes. Maximum modification effects are observed near 17 GPa with strain values near 3 x 10-3 and size values near 200 Å suggesting annealing at higher shock pressure, resulting from the higher shock temperature.

Line Broadening Studies on Highly Defective Al2O3 Produced by High Pressure Shock Loading

1983 ◽  
Vol 27 ◽  
pp. 369-378
Author(s):  
B. Morosin ◽  
E. J. Graeber ◽  
R. A. Graham
Keyword(s):  
Crystallite Size ◽  
Shock Loading ◽  
Lattice Strain ◽  
Powder Materials ◽  
Prior Work ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Pressure Shock ◽  
X Ray ◽  
Large Numbers

Enhanced solid state reactivity of materials both during and after shock compression has been attributed to the introduction of large numbers of defects into the crystalline lattices and to reduction in the particle and crystallite size of powders [1,2]. Line broadening of x-ray diffraction profiles provides a means to determine the residual lattice strain resulting from such defect concentrations as well as a means to determine the coherent crystallite size. Various diffraction studies on shock-loaded powder materials have previously been reported and much of this work primarily by Soviet and Japanese scientists has recently been reviewed [2]. Cohen has reported results on shock-loaded copper [3]. In prior work, however, shock, pressures have not typically been quantified and there are few detailed line broadening investigations of refractory inorganic powders [1,4,5]. The present study on shock-loaded alumina powders is a detailed investigation of the influence of shock loading on residual lattice strain and coherent crystallite size.

scholarly journals X-ray Line Broadening Study on Shock-modified Zirconia

1988 ◽  
Vol 41 (2) ◽  
pp. 251 ◽  
Author(s):  
B Morosin ◽  
RA Graham ◽  
Y Zhang ◽  
JM Stewart ◽  
CR Hubbard
Keyword(s):  
Shock Loading ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Usual Manner ◽  
Fitting Procedures ◽  
Crystallite Sizes ◽  
Post Shock ◽  
Powder Compacts ◽  
Peak Pressures

Zirconia (Zr02) powder compacts have been subjected to controlled, quantitative high pressure shock loading at peak pressures from 5-27 GPa and preserved for post-shock analysis. The overlapping broadened X-ray diffraction peak profiles have been separated by least-squares fitting procedures. The separate lines have been analysed in the usual manner to determine the residual lattice strain and the coherent crystallite sizes. Maximum modification effects are observed near 20 GPa with strain values near 3 x 10-3 and size values near 200 A.

X-Ray Diffraction Study of Shock-Modified Tetragonal Phases of SnO2 and MnO2

1992 ◽  
Vol 36 ◽  
pp. 595-601
Author(s):  
P. Newcomer ◽  
B. Morosin ◽  
R. A. Graham
Keyword(s):  
Shock Loading ◽  
Crystal Size ◽  
Lattice Strain ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
Pressure Shock ◽  
X Ray ◽  
Diffraction Line Profile ◽  
Coherent Crystal

AbstractX-ray diffraction line-profile analysis on tetragonal forms of SnO2 (cassiterite), MnO2 (pyrolusite), and previously studied TiO2 (rutile), which were subjected to high pressure shock loading, show that residual lattice strain and coherent “crystal” size are a function of shock parameters. An interesting observation on a sample of MnO2 concerns the recovery of cubic Mn2O3 (bixbyite) in the material subjected to 22 GPa, indicating a shock-induced chemical synthesis.

Estimation of lattice strain in nanocrystalline silver from X-ray diffraction line broadening

2007 ◽  
Vol 43 (4) ◽  
pp. 1175-1179 ◽  
Author(s):  
V. Biju ◽  
Neena Sugathan ◽  
V. Vrinda ◽  
S. L. Salini
Keyword(s):  
Lattice Strain ◽  
Diffraction Line ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
X Ray

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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