Magnetic insulation of space-charge dominated beam in a miniature cross-field device

2003 ◽  
Author(s):  
A. Lahav ◽  
V. Berezovsky ◽  
L. Schachter
Keyword(s):  
Space Charge ◽  
Magnetic Insulation ◽  
Field Device

Magnetic insulation of a space-charge dominated flow

2003 ◽  
Vol 94 (7) ◽  
pp. 4251-4255
Author(s):  
A. Lahav ◽  
V. Berezovsky ◽  
L. Schächter
Keyword(s):  
Space Charge ◽  
Magnetic Insulation

Direct Observation of the Diffusionless β → β + ω Transformation in Titanium Alloys

1971 ◽  
Vol 29 ◽  
pp. 122-123
Author(s):  
N. E. Paton ◽  
D. de Fontaine ◽  
J. C. Williams
Keyword(s):  
Electron Microscope ◽  
Titanium Alloys ◽  
Direct Observation ◽  
Dark Field ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Selected Area Electron Diffraction ◽  
Ti Alloys ◽  
Thin Foils ◽  
Field Device

The electron microscope has been used to study the diffusionless β → β + ω transformation occurring in certain titanium alloys at low temperatures. Evidence for such a transformation was obtained by Cometto et al by means of x-ray diffraction and resistivity measurements on a Ti-Nb alloy. The present work shows that this type of transformation can occur in several Ti alloys of suitable composition, and some of the details of the transformation are elucidated by means of direct observation in the electron microscope.Thin foils were examined in a Philips EM-300 electron microscope equipped with a uniaxial tilt, liquid nitrogen cooled, cold stage and a high resolution dark field device. Selected area electron diffraction was used to identify the phases present and the ω-phase was imaged in dark field by using a (101)ω reflection. Alloys were water quenched from 950°C, thinned, and mounted between copper grids to minimize temperature gradients in the foil.

Electron holography of interfaces in electroceramics

1993 ◽  
Vol 51 ◽  
pp. 1088-1089
Author(s):  
Vinayak P. Dravid ◽  
V. Ravikumar ◽  
Richard Plass
Keyword(s):  
Space Charge ◽  
Direct Evidence ◽  
Materials Science ◽  
Theoretical Work ◽  
Electron Holography ◽  
Resolution Limit ◽  
Interference Phenomenon ◽  
X Ray ◽  
Electron Sources ◽  
Science Community

With the advent of coherent electron sources with cold field emission guns (cFEGs), it has become possible to utilize the coherent interference phenomenon and perform “practical” electron holography. Historically, holography was envisioned to extent the resolution limit by compensating coherent aberrations. Indeed such work has been done with reasonable success in a few laboratories around the world. However, it is the ability of electron holography to map electrical and magnetic fields which has caught considerable attention of materials science community.There has been considerable theoretical work on formation of space charge on surfaces and internal interfaces. In particular, formation and nature of space charge have important implications for the performance of numerous electroceramics which derive their useful properties from electrically active grain boundaries. Bonnell and coworkers, in their elegant STM experiments provided the direct evidence for GB space charge and its sign, while Chiang et al. used the indirect but powerful technique of x-ray microchemical profiling across GBs to infer the nature of space charge.

ELECTROLYTIC COLORATION IN ALKALI HALIDES. ROLE OF THE SPACE CHARGE ON THE COLOR PROPAGATION

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-86-C7-86
Author(s):  
M. T. MONTOJO ◽  
F. JAQUE ◽  
C. SÁNCHEZ
Keyword(s):  
Space Charge ◽  
Alkali Halides

EFFECTS OF SPACE CHARGE ON THE "EFFECTIVE CROSS SECTION"

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-755-C7-756
Author(s):  
N. S. Kopeika ◽  
T. Karcher ◽  
C.S. Ih.
Keyword(s):  
Space Charge ◽  
Cross Section ◽  
Effective Cross Section

Ionic space charge and dissolution of AgCl

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-106-C6-108 ◽  
Author(s):  
L. S. Cain ◽  
N. Danieley ◽  
J.C.-Y. Lee ◽  
L. Slifkin
Keyword(s):  
Space Charge
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