Semiconducting Properties of AglB Te5

sorbs s t rongly in both the vis ib le and u l t rav io le t regions thus resul t ing in less rad iant energy being avai lab le for the luminescent process. Also when Ca~(PO4)2 is fo rmed by a degradat ion process at h igh temperatures, some of the manganese is re-moved f rom the phosphor to form (Ca, Mn) ~ (PO4) 5. This results in a decrease in the manganese mission, and thus the luminescent color shifts toward the b lue ant imony emission wi th a corresponding decrease in luminous efficiency. Acknowledgments The authors grate fu l ly acknowledge the contr i-but ions of Dr. John Parod i n the measurement and in terpretat ion of the magnet ic suscept ib i l i ty data, and Dr. R. L. Brown for the ref lectance measure-ment. Their thanks are also extended to Drs. E. F. App le and H. C. Froe l ich for thei r he lpfu l cr i t ic isms and discussions. Manuscript received Sept. 9, 1963. This paper was prepared for del ivery at the Toronto Meeting, May 3-7