Silver sintering

Group 18. - A 3He NMR study has been made of line-broadening in solid 3He-4He mixtures below 50 mK.571 2H NMR spectroscopy was used to study impurity-helium solids prepared by injecting deuterium atoms and mole-cules into superfluid He. Pulsed He NMR data were reported for solid He in a silver sinter down to temperatures of 400 pK.573 He NMR was used to characterise 3He nanoclusters embedded in h.c.p. 4He.574 Ferromagnetism of two-dimensional solid 3He has been investigated by SQUID NMR.575... 

The magnetic relaxation of solid and liquid He confined inside a silver sinter has been reported. The susceptibility of He films adsorbed on graphite has been reported.The competition of multiple spin exchanges in sub-monolayer solid He has been investigated. " The relaxation in powdered metallic antimony in contact with liquid He has been reported. Spin-polarized e has been used to study surfaces. e NMR spectroscopy has been used to... 

Collecting the silver halide. Meanwhile assemble the apparatus shown in Fig. 91. G is a filter-funnel having a sintered glass filter-plate... 

Copper and silver combined with refractory metals, such as tungsten, tungsten carbide, and molybdenum, are the principal materials for electrical contacts. A mixture of the powders is pressed and sintered, or a previously pressed and sintered refractory matrix is infiltrated with molten copper or silver in a separate heating operation. The composition is controlled by the porosity of the refractory matrix. Copper—tungsten contacts are used primarily in power-circuit breakers and transformer-tap charges. They are confined to an oil bath because of the rapid oxidation of copper in air. Copper—tungsten carbide compositions are used where greater mechanical wear resistance is necessary. 

Cadmium Sulfide Photoconductor. CdS photoconductive films are prepared by both evaporation of bulk CdS and settHng of fine CdS powder from aqueous or organic suspension foUowed by sintering (60,61). The evaporated CdS is deposited to a thickness from 100 to 600 nm on ceramic substates. The evaporated films are polycrystaUine and are heated to 250°C in oxygen at low pressure to increase photosensitivity. Copper or silver may be diffused into the films to lower the resistivity and reduce contact rectification and noise. The copper acceptor energy level is within 0.1 eV of the valence band edge. Sulfide vacancies produce donor levels and cadmium vacancies produce deep acceptor levels. 

Typical equipment made from tantalum includes heat exchangers, reaction vessels liners, thermowells, and heating elements or heat shields for high temperature vacuum sintering furnaces. Tantalum fabricated parts are found in the manufacturing of pharmaceuticals, explosives, insecticides, dyes, acidic baskets for silver cyanide barrel platers, and in hydrochloric and hydrobromic acid condensers. 

Silver electrodes prepared by any of the three methods are almost always subjected to a sintering operation prior to cell or battery assembly. 

Cells consist of porous sintered silver electrodes and high rate iron electrodes. The latter are enclosed with a seven-layered, controUed-porosity polypropylene bag which serves as the separator. The electrolyte contains 30% KOH and 1.5% LiOH. 

He studied the sintering of copper particles in the diameter range 15-100 microns and of silver particles of diameter 350 microns. The results for the larger volume fraction of copper and for silver were shown to fit the volume diffusion mechanism and yielded the results for volume self-diffusion... 

Several of the early studies aimed at finding the governing mechanisms of sintering were done with metal powders. A famous study was by Kuczynski (1949) who also examined the sintering of copper or silver to single-crystal metal plates but... 

Arsenik-schwarz, n. arsenic black, -silber, n. arsenical silver, -silberblende, /, (Min.) proustite, -sinter, m. scorodite, -Spiegel, m. arsenic mirror, -spiessglanz, m. allemontite. -verbindung, /, arsenic compound, -vitriol, m, arsenic sulfate, -wasserstoff, w, Arsen-wasserstoff. 

Pipette 25.0 mL of the bromide ion solution (0.01-0.02M) into a 400 mL beaker, add excess of dilute silver nitrate solution, filter off the precipitated silver bromide on a sintered glass filtering crucible, and wash it with cold water. Dissolve the precipitate in a warm solution prepared from 15 mL of concentrated ammonia solution, 15 mL of 1M ammonium chloride, and 0.3 g of potassium tetracyanonickelate. Dilute to 100-200 mL, add three drops of murexide indicator, and titrate with standard EDTA (0.01 M) (slowly near the end point) until the colour changes from yellow to violet. 

Commercial forms of the electrode are available and in general are similar to the calomel electrode depicted in Fig. 15.1(h) with the replacement of the mercury by a silver electrode, and calomel by silver chloride. The remarks concerning clogging of the sintered disc, and the use of ion exchange membranes and double junctions to reduce this are equally applicable to the silver-silver chloride electrode. 

Silver-silver chloride electrode 63, 553, (T) 554 Silylation (ch) gas, 236 liq, 219 Simultaneous spectrophotometric D chromium and manganese, 712 Sintered glass filtering crucibles 102 Soda lime 477... 

Although one of the most common storage batteries is called the nickel/cadmium system ( NiCad ), correctly written (-)Cd/KOH/NiO(OH)(+), cadmium is not usually applied as a metal to form a battery anode. The same can be said with regard to the silver/cadmium [(-) Cd / KOH / AgO (+)] and the MerCad battery [(-)Cd/KOH/HgO(+)]. The metallic negative in these cases may be formed starting with cadmium hydroxide, incorporated in the pore system of a sintered nickel plate or pressed upon a nickel-plated steel current collector (pocket plates), which is subsequently converted to cadmium metal by electrochemical reduction inside the cell (type AB2C2). This operation is done by the customers when they start the application of these (storage)... 

GP 2] [R 2] The smooth surface of the laser-LIGA OAOR silver is roughened and pitted after OAOR treatment and used during more than 1000 h of ethylene oxide synthesis [4]. The etched OAOR silver shows pronounced sintering and agglomeration for the same type of treatment. 

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