Cesium perchlorate

Cesium perchlorate [13454-84-7], CsClO, mol wt 232.35 and theoretical cesium content hi.25/q, is a crystalline powder that decomposes at 250°C Cesium fluoride [13400-13-0], CsF, mol wt 151.90, theoretical cesium content 87.49%, has a melting point of 682—703°C and a boiling point of 1253°C. Cesium fluoride is an extremely hygroscopic, colorless, crystalline soUd it has a solubUity of 3.665 kg/L of water at 18°C. Cesium fluoride is made by exactly neutrali2ing cesium hydroxide with hydrofluoric acid and evaporating the resultant solution to dryness at 400°C. Excess HE results in a bifluoride salt that does not decompose at 400°C, and carbonate in the starting material gives an alkaline product. 

Cesium Perchlorate. CSCIO4, raw 232.26, OB to Cs20 HC1 +13.8% rhombic crysts which change to a cubic form at 219° mp 250° with decompn d 3.327g/cc (Ref 7). Gordon ... 

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... 

Of even more recent interest are flares or rocket grain ingredients that are apt to produce a large number of ions from the exposure of alkali metal to high temperature. Presence of alkali metal additives in rocket exhaust at 3000 K is said to cause in excess of ICP ions/cm , and from mixtures of aluminum with the nitrates of cesium or ptotass him, electron densities of the order of 10 /cm have been reported. " Shidlovsky quotes from Reference 250 that a cesium plasma may be obtained frc n a mixture of aluminum and cesium perchlorate. The sutqect of the direct dispersion of alkali metals and other substances at Wgh altitude will be discussed in the concluding passages to Chapter 19. 

Marguerite Perey worked on the investigation of very pure actinium in France in 1939. She found a particles and could show that these did not come from protactinium. Moreover, she could follow an element growing in the actinium sample, an element with p activity. After dissolving the sample she found that the element with p activity did not follow barium in precipitation of barium carbonate. Nor did it follow lead in lead sulfide or cerium in cerium(iv) hydroxide precipitation. However, it was carried by cesium when cesium perchlorate was precipitated. Element number 87 ought to be an alkali metal, a new element that Margeruite Perey had discovered. She named it francium after her native country. 

Transport rates for alkali metal perchlorates across bulk chloroform membranes by the lipophilic diazacrown compounds 9-11,14 and 15 are presented in Table 2. In all cases, transport of lithium and cesium perchlorates was undetectable. 

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