Studies of rare earth compounds

Author

Rostam Mondegarian, New Jersey Institute of Technology

Document Type

Thesis

Date of Award

3-31-1972

Degree Name

Master of Science in Chemical Engineering - (M.S.)

Department

Chemical Engineering and Chemistry

First Advisor

Lawrence Suchow

Second Advisor

Donald G. Lambert

Third Advisor

Howard S. Kimmel

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⁺

Recommended Citation

Mondegarian, Rostam, "Studies of rare earth compounds" (1972). Theses. 2054.
https://digitalcommons.njit.edu/theses/2054