Grain Impingement and Intrinsic Stresses in CVD Diamond

1997 ◽  
Vol 505 ◽  
Author(s):  
S. Nijhawan ◽  
J. Rankin ◽  
B. L Walden ◽  
B. W. Sheldon
Keyword(s):  
Tensile Strain ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Intermediate Annealing ◽  
X Ray Diffraction ◽  
Entire Sample ◽  
X Ray ◽  
Pole Figures ◽  
Annealing Step ◽  
Film Microstructure

ABSTRACTIntrinsic stresses in polycrystalline CVD diamond films have been related to restructuring at grain boundaries. It is speculated that reducing the interfacial energy induces an elastic tensile strain. There appears to be a correlation between the evolution of macroscopic stresses in the entire sample and localized, non-homogeneous stresses in the microstructure based on Raman Spectroscopy and x-ray diffraction pole figures. A multistep processing sequence developed previously can help reduce these stresses substantially, by using an intermediate annealing step when the diamond grains are partially coalesced. Our results suggest that small changes in the film microstructure due to annealing can reduce both homogeneous and non-homogeneous stresses.

Local order in CVD diamond films : Comparative Raman, x-ray-diffraction, and x-ray-absorption near-edge studies

1998 ◽  
Vol 57 (22) ◽  
pp. 14123-14132 ◽  
Author(s):  
L. Fayette ◽  
B. Marcus ◽  
M. Mermoux ◽  
G. Tourillon ◽  
K. Laffon ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

ESR and X-ray diffraction studies of the CVD diamond films

1997 ◽  
Vol 12 (1) ◽  
pp. 53-59 ◽  
Author(s):  
K. Fabisiak ◽  
F. Rozpłoch
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
X Ray Diffraction ◽  
X Ray

X-ray diffraction characterization of epitaxial CVD diamond films with natural and isotopically modified compositions

2016 ◽  
Vol 61 (6) ◽  
pp. 979-986 ◽  
Author(s):  
I. A. Prokhorov ◽  
A. E. Voloshin ◽  
V. G. Ralchenko ◽  
A. P. Bolshakov ◽  
D. A. Romanov ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
X Ray Diffraction ◽  
X Ray

Stress study of HFCVD boron-doped diamond films by X-ray diffraction measurements

2001 ◽  
Vol 10 (3-7) ◽  
pp. 750-754 ◽  
Author(s):  
N.G. Ferreira ◽  
E. Abramof ◽  
E.J. Corat ◽  
N.F. Leite ◽  
V.J. Trava-Airoldi
Keyword(s):  
Diamond Films ◽  
X Ray Diffraction ◽  
Boron Doped Diamond ◽  
X Ray ◽  
Boron Doped ◽  
Stress Study

Textures Applied to Mechanical Processing Technology Assessment in Ancient Bronze

2005 ◽  
Vol 495-497 ◽  
pp. 719-724
Author(s):  
R.E. Bolmaro ◽  
B. Molinas ◽  
E. Sentimenti ◽  
A.L. Fourty
Keyword(s):  
Orientation Distribution ◽  
Distribution Functions ◽  
Archaeological Sites ◽  
Mechanical Processing ◽  
Post Processing ◽  
X Ray Diffraction ◽  
Mechanical Process ◽  
X Ray ◽  
Pole Figures ◽  
Microscopic Inspection

Some ancient metallic art craft, utensils, silverware and weapons are externally undistinguishable from modern ones. Not only the general aspect and shape but also some uses have not changed through the ages. Moreover, when just some small pieces can be recovered from archaeological sites, the samples can not easily be ascribed to any known use and consequently identified. It is clear that mechanical processing has changed along history but frequently only a "microscopic" inspection can distinguish among different techniques. Some bronze samples have been collected from the Quarto d’Altino (Veneto) archaeological area in Italy (paleovenetian culture) and some model samples have been prepared by a modern artisan. The sample textures have been measured by X-ray Diffraction techniques. (111), (200) and (220) pole figures were used to calculate Orientation Distribution Functions and further recalculate pole figures and inverse pole figures. The results were compared with modern forging technology results. Textures are able to discern between hammering ancient techniques for sheet production and modern industrial rolling procedures. However, as it is demonstrated in the present work, forgery becomes difficult to detect if the goldsmith, properly warned, proceeds to erase the texture history with some hammering post-processing. The results of this contribution can offer to the archaeologists the opportunity to take into consideration the texture techniques in order to discuss the origin (culture) of the pieces and the characteristic mechanical process developed by the ancient artisan. Texture can also help the experts when discussing the originality of a certain piece keeping however in mind the cautions indicated in this publication.

Silkworm Silk under Tensile Strain Investigated by Synchrotron X-ray Diffraction and Neutron Spectroscopy

2007 ◽  
Vol 40 (4) ◽  
pp. 1035-1042 ◽  
Author(s):  
Tilo Seydel ◽  
Klaas Kölln ◽  
Igor Krasnov ◽  
Imke Diddens ◽  
Nadine Hauptmann ◽  
...  
Keyword(s):  
Tensile Strain ◽  
Neutron Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silkworm Silk

Residual stresses in chemical vapor deposition free-standing diamond films by X-ray diffraction analyses

2000 ◽  
Vol 288 (2) ◽  
pp. 217-222 ◽  
Author(s):  
O Durand ◽  
R Bisaro ◽  
C.J Brierley ◽  
P Galtier ◽  
G.R Kennedy ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Residual Stresses ◽  
Vapor Deposition ◽  
Diamond Films ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Free Standing ◽  
X Ray

scholarly journals Selection of CVD Diamond Crystals for X-ray Monochromator Applications Using X-ray Diffraction Imaging

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 396 ◽  
Author(s):  
Stanislav Stoupin ◽  
Thomas Krawczyk ◽  
Zunping Liu ◽  
Carl Franck
Keyword(s):  
Spline Interpolation ◽  
Cvd Diamond ◽  
Effective Radius ◽  
Radius Of Curvature ◽  
X Ray Diffraction ◽  
Average Width ◽  
Rocking Curve ◽  
X Ray ◽  
Single Crystal Diamond ◽  
Diffraction Imaging

A set of 20 single crystal diamond plates synthesized using chemical vapor deposition (CVD) was studied using X-ray diffraction imaging to determine their applicability as side-bounce (single-reflection) Laue monochromators for synchrotron radiation. The crystal plates were of optical grade (as provided by the supplier) with (001) nominal surface orientation. High dislocation density was found for all samples. Distortions in the crystal lattice were quantified for low-index Laue reflections of interests using rocking curve topography. Maps of effective radius of curvature in the scattering plane were calculated using spline interpolation of the rocking curve peak position across the studied plates. For several selected plates, nearly flat regions with large effective radius of curvature were found ( R 0 ≳ 30 - 70 m, some regions as large as 1 × 4 mm 2 ). The average width of the rocking curve for these regions was found to be about 150 μ rad (r.m.s.). These observations suggest that the selected CVD diamond plates could be used as intermediate-bandwidth monochromators refocusing the radiation source to a specific location downstream with close to 1:1 distance ratio.

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