Concentration dependences at the critical temperatures in vacuum topotaxial Ag2Se thin layers

The temperature and concentration dependences of kinematic viscosity of alloys of Cu-Ag system with Ag content to 99 mass % in liquid state have been studied. It has been found that heating above certain critical temperatures leads to transform the melt to equilibrium state. The kinematic viscosity of the Cu-Ag melts are extremely depend from silver content in the alloy. The new regime of amorphous ribbon production is selected. Proposed regime leads to increasing of microhardness and weld strength on 10 % and corrosion resistivity on 15 %.

Download Full-text

Concentration dependences of the critical temperatures of binary mixtures of nonaqueous components

Russian Journal of Physical Chemistry A ◽

10.1134/s0036024408110125 ◽

2008 ◽

Vol 82 (11) ◽

pp. 1857-1862 ◽

Cited By ~ 6

Author(s):

A. G. Nazmutdinov ◽

E. V. Alekina ◽

T. N. Nesterova

Keyword(s):

Binary Mixtures ◽

Critical Temperatures ◽

Concentration Dependences

Download Full-text

Spectral and concentration dependences of the optical properties of thin layers of oxidized amorphous copper and nickel nanoparticles in the infrared spectral region

Optics and Spectroscopy ◽

10.1134/s0030400x09050257 ◽

2009 ◽

Vol 106 (5) ◽

pp. 767-773

Author(s):

A. Ya. Khaĭrullina ◽

T. V. Ol’shanskaya ◽

D. A. Yavsin ◽

V. M. Kozhevin ◽

S. A. Gurevich

Keyword(s):

Optical Properties ◽

Spectral Region ◽

Nickel Nanoparticles ◽

Thin Layers ◽

Infrared Spectral Region ◽

Concentration Dependences ◽

Infrared Spectral

Download Full-text

Immunoferritin localization of intracellular antigens in positively stained frozen sections

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010008170x ◽

1978 ◽

Vol 36 (2) ◽

pp. 168-169

Author(s):

K. T. Tokuyasu

Keyword(s):

Surface Tension ◽

Water Surface ◽

Thin Layers ◽

The Other ◽

Positive Staining ◽

Frozen Sections ◽

The Past ◽

Ultrathin Frozen Sections ◽

Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Download Full-text

Rapid Critical Point Drying of Tissues in a Parr Bomb

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100095261 ◽

1972 ◽

Vol 30 ◽

pp. 400-401

Author(s):

C.A. Baechler ◽

W. C. Pitchford ◽

J. M. Riddle ◽

C.B. Boyd ◽

H. Kanagawa ◽

...

Keyword(s):

Critical Point ◽

Critical Pressure ◽

Soft Tissues ◽

Biological Tissues ◽

Critical Temperatures ◽

Air Drying ◽

The Past ◽

Critical Point Drying ◽

Great Stress ◽

Infiltration Techniques

Preservation of the topographic ultrastructure of soft biological tissues for examination by scanning electron microscopy has been accomplished in the past by using lengthy epoxy infiltration techniques, or dehydration in ethanol or acetone followed by air drying. Since the former technique requires several days of preparation and the latter technique subjects the tissues to great stress during the phase change encountered during air-drying, an alternate rapid, economical, and reliable method of surface structure preservation was developed. Turnbill and Philpott had used a fluorocarbon for the critical point drying of soft tissues and indicated the advantages of working with fluids having both moderately low critical pressures as well as low critical temperatures. Freon-116 (duPont) which has a critical temperature of 19. 7 C and a critical pressure of 432 psi was used in this study.

Download Full-text

EELS Measurement of the Local Electronic Structure of Copper Atoms Segregated to Aluminum Grain Boundaries

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100164179 ◽

1996 ◽

Vol 54 ◽

pp. 342-343

Author(s):

S.J. Splinter ◽

J. Bruley ◽

P.E. Batson ◽

D.A. Smith ◽

R. Rosenberg

Keyword(s):

Electronic Structure ◽

Grain Boundaries ◽

Boundary Segregation ◽

Thin Layers ◽

Nominal Composition ◽

Spatially Resolved ◽

Service Lifetime ◽

Heat Treated ◽

Probe Size ◽

Local Electronic Structure

It has long been known that the addition of Cu to Al interconnects improves the resistance to electromigration failure. It is generally accepted that this improvement is the result of Cu segregation to Al grain boundaries. The exact mechanism by which segregated Cu increases service lifetime is not understood, although it has been suggested that the formation of thin layers of θ-CuA12 (or some metastable substoichiometric precursor, θ’ or θ”) at the boundaries may be necessary. This paper reports measurements of the local electronic structure of Cu atoms segregated to Al grain boundaries using spatially resolved EELS in a UHV STEM. It is shown that segregated Cu exists in a chemical environment similar to that of Cu atoms in bulk θ-phase precipitates.Films of 100 nm thickness and nominal composition Al-2.5wt%Cu were deposited by sputtering from alloy targets onto NaCl substrates. The samples were solution heat treated at 748K for 30 min and aged at 523K for 4 h to promote equilibrium grain boundary segregation. EELS measurements were made using a Gatan 666 PEELS spectrometer interfaced to a VG HB501 STEM operating at 100 keV. The probe size was estimated to be 1 nm FWHM. Grain boundaries with the narrowest projected width were chosen for analysis. EDX measurements of Cu segregation were made using a VG HB603 STEM.

Download Full-text