Notebooks Curies

February 28th, 2012
by Richard

There are different ways of allocating polonium, in particular, electrochemical, when the metal polonium release on the platinum or gold cathode, and then separated by distillation. Polonium – the fusible metal and the relatively low boiling, the temperature of its melting and boiling points, respectively, 254 and 962 C. Fundamentals of chemistry is quite obvious that the present improved methods receipt and allocation of polonium were made possible only after a thorough study of the rare radioactive metal. And his connections, of course. Principles of Chemistry polonium laid by its discoverer. In one laboratory Notebooks Curies have a record made in 1898: "After the first treatment pitchblende polonium is precipitated with sulfuric acid is not complete and may be partially removed by washing with dilute SO4H2 (here and below, saved chemical indexing of the original). In contrast, the two treatments balance pitchblende and one treatment residue German ore give carbonates carbonates, and carbonate dissolved in acetic acid, SO4H2 completely precipitates the active substance. Later on this item learned much more.

Learned, in particular, that the elementary polonium – a silvery-white in color – exists in two allotropic modifications. Crystals one of them – low – have a cubic lattice, and another – high – orthorhombic. Phase transition from one form to another occurs at 36 C, but at room temperature polonium is high-temperature form. His warms your own radioactivity. In appearance similar to any polonium an ordinary metal. According ready fusibility – for lead and bismuth. On electrochemical properties – at precious metals.

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