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The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Studies of rare earth compounds
Author: Mondegarian, Rostam
View Online: njit-etd1972-022
(VII, 81 pages ~ 3.0 MB pdf)
Department: Department of Chemical Engineering and Chemistry
Degree: Master of Science
Program: Chemical Engineering
Document Type: Thesis
Advisory Committee: Suchow, Lawrence (Committee chair)
Lambert, Donald G. (Committee member)
Kimmel, Howard S. (Committee member)
Date: 1972-03
Keywords: Earths, Rare
Availability: Unrestricted
Abstract:

The work reported herein has consisted of miscellaneous studies of rare earth compounds.

  1. The Pr—As system was studied with a view to obtaining a ferromagnetic composition.
  2. Attempts were made to prepare ternary compounds by solid state reaction of PrAs, GdAs or YbAs with MnAs, CrAs or FeAs, and PrP, GdP, or YbP with MnP, CrP or FeP.
  3. Attempts were made to prepare quaternary compounds by solid state reaction of YbAs, YbP and GdAs with CdI2 in various molar ratios. In many cases new compouns appeared to be formed but because of complexity of the X—ray patterns it was not possible to determine the structure or compositions of these compounds.
    In the case of YbAs+CdI2 and CdI2+2YbAs at 570° C. It was found that the reaction yields a mixture of Cd3As2 and YbI3.
  4. Attempts were made to prepare ternary compounds in the systems YbI3+YbAs and GdI3+GdAs. In these cases new compounds appeared to be formed but because of the complexity of the X—ray patterns it was not possible to determine the structure or compositions of these compounds.
  5. The reflectance spectra of Pr and Nd garnets with rare earths on two crystallographic sites which have been prepared in this laboratory were studied. In one system with Pr on dodecahedral sites, new absorption bands at 350-450 mμ and 490-575 mμ were observed.
    The new absorption. bands are believed to be due to the presence of small quantities of Pr4+ and Yb2+ ions by the redox reaction.
    Pr3+ + Yb3+ <--- ---> Pr4+ + Yb2+


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