White tin oxide

Stannic Oxide (White Tin Oxide, Tin Dioxide, Stannic Anhydride, Flowers of Tin Stannic Acid, Cassiterite). Sn02, mw 150.69, white powd, mp 1127°, bp 1800-1900° (subl), d 6.95 g/cc. Sol in coned sulfuric and coned hydrochloric acids, si sol in hot coned aq KOH or NaOH. Prepn is by reacting Sn with coned nitric acid (d 1.41 g/cc) on a w bath forming 0-stannic acid. The 0-stannic acid is then heated to a red heat and converted to Sn02. It is used as a chemical reagent and (see above) as an antifouling, flash and barrel wear reducing additive in propints... 

Synonyms stannic oxide tin dioxide tin peroxide white tin oxide stannic anhydride flowers of tin... 

Stannic Oxide. White tin oxide tin dioxide stannic anhydride Bowers of tin. OjSn mol wt 150.70. O 21.23%, Sn 78.77%. Sn02. Occurs in nature as the mineral eassiterite. The commercial grade is also known as polishing powder, putty powder, or (In ash. 

Synonyms/Trade Names Stannic dioxide. Stannic oxide. White tin oxide I [Note Also see specific listing for Tin(ll) oxide (as Sn).] ... 

Tin ll) oxides. Lower tin oxides SnO (white, NH4OH to SnCli solution black, heat on white SnO red), form a complex system. 

Ordinary white tin is not attaeked by air at ordinary temperatures but on heating in air it forms tin(IV) oxide, Sn02. 

Tin oxide is a pure white powder. Mixed with water, glycerol, or alcohol into a paste, it is used for polishing teeth and metallic restorations. 

Steam-turbine lubricants Lubricants in steam turbines are not exposed to such arduous conditions as those in engines. The main requirement is for high oxidation stability. However, they may be exposed to aqueous condensate or, in the case of marine installations, to sea water contamination, so they have to be able to separate from water easily and to form a rustpreventing film on ferrous surfaces, and it is usual to employ rust inhibitors. The problem of tin oxide formation on white-metal bearings is associated with the presence of electrically conducting water in lubricants and can be over-come by keeping the lubricant dry . 

Tin oxide White upper Egypt, second century b.c.e. 

All these conflicts can now be resolved because of what appears to be a deflnitive experiment by Bocquet et al. (4), who directly measured the internal conversion coefficients of the transition from the first nuclear level to the ground state. They directly compared the L, M, N, and O conversion electron intensities in two different states—namely, in stannic oxide and white tin. They found that the 5s electron density is 30% smaller in stannic oxide than in white tin, and since the isomer shift of stannic oxide is negative with respect to white tin, AR is clearly positive. From these data, the Brookhaven group has calculated the value for AR/R for tin-119 as +3.3 X 10". ... 

The reduction of tin(IV) oxide to (white) tin metal by graphite proceeds at moderately low temperatures. More commonly, tin(IV) oxide is reduced to the metal by an excess of carbon monoxide at temperatures above 980 K. (a) Write the two chemical equations for the reduction of SnOz. 

Majolica is an earthenware pottery characterized by a creamy light-buff-colored paste and an opaque white tin-lead glaze coating the entire outer surface of the vessel. However, the most outstanding feature of the majolica pottery perhaps lies in its decoration, being the subject of numerous studies by art historians. Majolica decorations are produced from metallic oxides that always are applied on top of the tin glaze. 

The electronic ink is supplied by E ink corporation (Comiskey 1998). The film consists of electrophoretic microcapsules in a polymer binder, coated on to a 25 pm polyester/indium tin oxide sheet (Fig. 14.10). Optical contrast is achieved by moving black and white sub-micron particles with opposite charge in a transparent fluid within a microcapsule. Depending on which sub-micron particles are closest to the viewer, light is scattered back (white state) or absorbed (black state). The electrophoretic effect is multi-stable - without any electric field the microcapsules keep their switching state. This greatly reduces the power consumption of the display (Ritter 2001). 

Brill (6) summarized the information on the chemical basis of medieval glass colors as follows red/orange opaque enamels, cuprite (Cu20) with lead additions beneficial for opacity white opaque enamels, either tin oxide opa-... 

Propyl stannonic acid is obtained by shaking ethyl bromide with an alkaline solution of potassium hydrogen stannite in the presence of alcohol for fourteen days. It is a white po vder which yields propane, propyl alcohol, propylene, water, and tin oxides wdien heated in the absence of air. The acid forms sodium, potassium, and basic calcium and barium salts. Tin propyl iribromide and trichloride are prepared from it in the usual manner, and boiling with 10 per cent, alkali converts them to the dipropyl oxide. 

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