Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . tion-ation had practioally reaohed the limit of efficiency other methods were ap-plied as follows: The lanthanum-praseodymium fractions were ohanged to the ammonium-double 8 nitrates and fractioned from nitric aoid (sp. gr. ) (Auer von Welsbach ). The neodymium fraotions were continued as the magnesium double nitrates. The soluble end containing samarium and etc was split off and fraotion- ed as magnesium double nitrate from nitrio aoid (sp. gr. ) with addition ll) of the isomorphous bismuth magnesium n
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . tion-ation had practioally reaohed the limit of efficiency other methods were ap-plied as follows: The lanthanum-praseodymium fractions were ohanged to the ammonium-double 8 nitrates and fractioned from nitric aoid (sp. gr. ) (Auer von Welsbach ). The neodymium fraotions were continued as the magnesium double nitrates. The soluble end containing samarium and etc was split off and fraotion- ed as magnesium double nitrate from nitrio aoid (sp. gr. ) with addition ll) of the isomorphous bismuth magnesium nitrate, (Urbain and Laoombe ). The above are still in progress and already very pure neodymium,samariumand lanthanum earths have been obtained whioh are to be used in other investi-gations . The primary object of this investigation being the preparation of pure yttria, it was deoided to attempt this by the combination of two methods. The two seleoted as the most suitable were the broma-ce method of James12) 3) (James , and a modification of the chromate method used by Huthmann and. -5- 21) Bohm The yttrium earths were first subjected to the fractionation of the bro-mates and the prooess was carried out substantially as described except that750 oo. Jena flasts were found preferable to the casseroles used by ProfessorJames. After the bromates had been fraotionated until they had separatedinto well defined parts, portions which were richest in yttrium were removedand treated by the ohromate method for the preparation of pur? vttria. 13) Study of the Chromate (Historical). In 1835 Berlin observ-ed that a solution of the chromates of the yttrium earths would dissolve moreyttrium earths and that on boiling a basio salt was preoipitated while thesolution remained neutral. Evidently he had partially fraotioned the oldyttria into its components. 14) In 1867 Pattison and Clark dissolved a mixture of oerium, didymium, o and lanthanum oxides in chromio acid and heated to dryness
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