This property is used in the first stages of the separation of radium from barium by fractional crystallization. It is less soluble in water than other alkaline earth metal chlorides – at 25 ☌ its solubility is 245 g/L whereas that of barium chloride is 307 g/L, and the difference is even larger in hydrochloric acid solutions. Its color gradually changes to yellow with aging, whereas contamination by barium may impart a rose tint. Radium chloride is a colorless salt with a blue-green luminescence, especially when heated. It can produced by treating radium carbonate with hydrochloric acid. Radium chloride can also be prepared by heating radium bromide in a flow of dry hydrogen chloride gas. If the presence of other anions is suspected, the dehydration may be effectuated by fusion under hydrogen chloride. The dihydrate is dehydrated by heating to 100 ☌ in air for one hour followed by 5.5 hours at 520 ☌ under argon. Radium chloride crystallises from aqueous solution as the dihydrate. The first preparation of radium metal was by the electrolysis of a solution of this salt using a mercury cathode. Marie Curie and André-Louis Debierne used it in their original separation of radium from barium. It was the first radium compound isolated in a pure state. It is a radium salt of hydrogen chloride. Klevtsov, Kristallografiya, 12, 1097 (1967).Radium chloride is an inorganic compound with the chemical formula Ra Cl 2. Kaminskii, Laser Crystals, Nauka, Moscow (1975).Ī. Ford, Textbook of Mineralogy, 4th edition, Wiley, New York (1932) [Russian translation: ONTI, Leningrad-Moscow (1937).Į. Bokii, Crystal Chemistry, Nauka, Moscow (1971).Į.
Belov, Mineralogy and the Periodic Law, Izd-vo Akad. Trunov, Summary of Doctoral Thesis, Moscow State University, Moscow (1972)
Golub, Summaries of Papers Presented at the Eleventh All-Union Conference on the Use of X Rays for the Study of Materials, Nauka, Moscow (1976), p. Kharchenko, in: The Growth of Crystals, Vol.
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