Study on Some Tl Base Alloys, with Reference to their Electronic Structure

Kinds and boundaries of phases at room temperature in Tl-rich sides of the alloy systems of Tl-Cd, Tl-Sn and Tl-Sb were determined by X-ray and electron diffraction. From the consideration of experimental results obtained in the present work as well as in previous works by other workers, it was deduced that phase boundaries of a particular structure in some Tl base alloys appeared to correspond to the same electron atom ratio and to be affected mainly by the electronic factor. The results obtained from the lattice constant and density measurements in the f.c.c. region of Tl-Sn system, which was confirmed to be stable, were interpreted in terms of the Brillouin zone concept. Considering Matyas' result for trivalent Al, a suggestion for the high energy portion of N ( E ) curve for the f.c.c. structure was proposed.