Marignac c jean charles (2 risultati)

Paris, Victor Masson et Fils, 1866. 8vo. Contemp. hcalf, raised bands, gilt spine. Light wear along edges. Small stamps on verso of titlepage. In: "Annales de Chimie et de Physique", 4e Series - Tome VIII. 512 pp. a. 3 folded engraved plates. (The entire volume offered). Marignac's paper: pp. 5-75. The paper describes his successfull separation of tantalum and columbium, "and he also shows that columbium is both tri- and pentavalent, whereas tantalum always has a valency of five. The separation is based on the insolubility of potassium fluo-oxyycolumbate." (Weeks p. 83). …

(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.…