LANTHANIDE BORIDE SYSTEMS AND PROPERTIES. PART I. LANTHANIDE-BORON-CARBON SYSTEMS. PART II. VAPORIZATION AND STABILITIES OF LANTHANIDE BORIDES (thesis)

Abstract

This dissertation presents the results of experimental studies on J the rare earth borides and rare earth borocarbides. The work consisted * of six parts: (1) the ternary phases and equilibria in Ln-B-C systems; b , (2) the structure of the phase, LnB C2; (3) the discovery of the new hectobbride phase; (4) the vaporization characteristics of the rare earth ' borides; (5) the decomposition pressures and the heat of sublimation of Gd84; and (6) ternary Ln-M-B compatibility studies and the boron poten-/ tial series"The ternary Ln-B-C systems were investigated by arc melting and X-ray diffraction techniques. Emphasis was placed on the metal-deficient portion of the ternary Gd-B-C system. . Five ternary phases were.