Phase Equilibria and Manganese-Activated Luminescence in the Systems CdO-P[sub 2]O[sub 5] and Zn[sub 2]P[sub 2]O[sub 7]-Cd[sub 2]P[sub 2]O[sub 7]; Summary for the System ZnO-CdO-P[sub 2]O[sub 5]

Abstract

The equilibrium relationships in the system and a portion of the system were constructed from quench, D.T.A., and high‐ temperature x‐ray data. The compatibility and solid solution relationships in the system are summarized. The pyrophosphate join is a simple eutectic‐type binary system with a maximum of soluble in and . Beta zinc pyrophosphate is stabilized to room temperature by the addition of a minimum of in solid solution. In addition to the meta‐, pyro‐, and orthophosphate, a fourth stable cadmium phosphate compound, , was found to exist. Cathodoluminescence emission data are presented for the pyrophosphate solid solutions and for using molar substitutions of divalent manganese as an activator. The stablilized solid solution phosphors emit in the range 6620–6420Aå with low brightness values and the solid solution phosphors emit near 6200Aå with considerably higher brightnesses. Tetracadmium phosphate was only weakly responsive to cathode ray excitation.