Rare earth discovery (2 Ergebnisse)

(Paris, Gauthier-Villars), 1886. 4to. No wrappers. In: "Comptes Rendus hebdomadaires des Séances de L'Academie des Sciences", Tome 102, No 18. Pp. (991-) 1041. (Entire issue offered). The papers: pp. 1003-1004 a. 1005-1006. First apperance of the papers in which Lecoc de Boisbaudran described how he separated Holmium into two kinds of earths and naming them."He accomplished this by fractional prepicitation, first with ammonium hydroxide and then with a saturated solution of potassium sulfate, and found that the constituents of pure holmium solutions precipitate in the folloeing order: terbium, dysprosium, holmium, and erbium. Lecog de Boisbaudran never had an abundant supply of raw materials for his remarkable researches on the rare earths, and he once confided to professor Urbain that most of his fractionations had been carried on on the marble slab of his fireplace."(Weeks "Discovery of the Eelements").Parkinson "Breakthroughs", 1886 C.…

(Paris, Gauthier-Villars), 1878. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 87, No 17. Pp. (570-) 616. (Entire issue offered). Marignac's paper: pp. 578-581. First apperance of the paper relating Marignac's discovery of the rare earth Ytterbium (Ytterbia)."He began his study of the rare earths in 1840, when he was barely twenty-three years old. According to P.T. Cleve, "Marignac's work on the rare earths is undoubtedly the most importent in this particular department of chemistry". In 1878 marignac heated some erbium nitrate obtained from gadolinite until it decomposed. When he extracted the resulting mass with water, he obtained two oxides: a red one, for which he retained the name Erbia, and a colorless one, which he named Ytterbia." (Weeks "The Discovery of the Elements").Parkinson "Breakthroughs", 1878 C.…