Cesium azide

It can be isolated by elecytrolysis of the fused cyanide and by a number of other methods. Very pure, gas-free cesium can be prepared by thermal decomposition of cesium azide. 

Cesium is obtained from its ore pollucite. The element in pure form may be prepared by several methods (i) electrolysis of fused cesium cyanide, (ii) thermal reduction of cesium chloride with calcium at elevated temperatures, and (iii) thermal decomposition of cesium azide. It is stored under mineral od. The element must be handled under argon atmosphere. 

Cesium Azide. See Vol l,p A528-R Cesium Nitrate. See under Nitrates CesiumNitrites, See under Nitrites Cesium Perchlorate. See under Perchlorates Cesium Periodate. See under Periodates Cesium Permanganote. See under Permanganates... 

Potassium, rubidium, and cesium azides are of particular interest, since they undergo thermal decomposition at higher temperatures with the formation of the free alkali metals and the evolution of nitrogen in accordance with the equation... 

Cement, laboratory, 1 189 Cerite, extraction of, 2 44 Cerium, phosphor containing strontium sulfide and, 3 23 separation of, from rare earth mixtures, 2 43, 47, 48 test for, 2 50 Cerium amalgam, 1 15 Cerium-group earths, separation of, from yttrium earths by doublesulfate method, 2 44, 46 Cerium (III) magnesium nitrate, 2Ce(N03)s-3Mg(N03)2-24H,0, separation of praseodymium from lanthanum by, 2 57 Cerium(III) nitrate, 2 51 Cerium (IV) nitrate, basic, 2 49 Cesium, cesium azide for preparation of, 1 79... 

Cesium antimony (III) chloride, 3CsCl-2SbCls, precipitation in extraction of cesium from pollucite, 4 6 Cesium azide, 1 79 Cesium dibromoiodate(I), 5 174 Cesium dichloroiodate(I)(iodo-dichloride), 4 9 5 174 analysis of, 4 11 Cesium diiodoiodate(I), 5 174 Cesium nitrate, 4 6 1-hydrogen nitrate, 4 7 Cesium titanium alum, 6 50 Charcoal, sugar, 2 74 Chelate compounds, of 1,3-diketones, 2 11 5 105 of o-hydroxyaldehydes and o-hy-droxyphenones, 2 11... 

CsICl2 Cesium iododichloride, 4 9 CsNOs Cesium nitrate, 4 6 1-hydrogen nitrate, 4 7 CsN3 Cesium azide, 1 79 CuBr Copper(I) bromide, 2 3 CuCl Copper(I) chloride, 2 1 [CuC1-CO]-2H20 Copper carbonyl chloride, 2 4... 

N3C2H202(NH2) Urazine (4-amino-urazole), 4 29 salts, 4 31 NsCs Cesium azide, 1 79 NSH Hydrazoic acid, 1 77, 78 Hydrogen azide, 1 77, 78 N3K Potassium azide, 1 79 2 139, 140... 

Carbonyl Diazide A528 L Cellulose Triacetate. See under Acetyl Celluloses A55-R Cerium Azide A528-R Cerium Hydroxydiazide A528-R Cerium Triazide A528-R Cesium Azide A528-R Cesium Carbide A72 L Chain Reaction. See under Atomic Energy A501-L... 

A cyclic N2O isomer has not been detected yet, but theoretical calculations indicate its formation in the decomposition of nitrosyl azide and in the reaction of OF2 with cesium azide. Dinitrogen monoxide is only metastable at lower temperatures, at temperatures above 870 K it decomposes to the elements (AZZ = +82.10kJmoD ) ... 

CsjN4,750PtC4 XH2O, Platinate, tetracyano, cesium azide (1 2 0.25), hydrate, 21 149... 

Cerium Triazide A528-R Cesium Azide A528-R Cesium Carbide A72-L Chain Reaction. See under Atomic Energy A501-L... 

The metal reduction of the polycyclic system is usually carried out in an ether solvent and by an alkali metal at low temperature (—78 °C). When potassium metal is applied it is best to prepare a metal mirror. Sodium and lithium react, either directly in the form of a metal wire, or after treatment in an induction furnace. Cesium is prepared by thermolysis of cesium azide. It has recently been found that the application of an ultrasonic bath facilitates the reaction and avoids side reactions. The reaction can be carried out in a modified NMR tube or in an ESR cavity. Diamagnetic ions are prepared in extended NMR tubes to which the metal is extruded and sealed under vacuum. Reaction rates are difficult to compare as the electron-transfer process depends on various experimental conditions such as concentration, temperature, the presence of impurities, the solvent and the nature of the metal surface. It may take from minutes to days to form the first radical-anion the second step then follows and can sometimes be rather slow 10 13). 

The change of entropy in the high pressure transition is close to 1.38 cal/mol. deg. (R In 2) for rubidium and cesium azides, while it is close... 

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