Phase Equilibria and Tin-Activated Luminescence in Strontium Orthophosphate Systems

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Abstract
Strontium orthophosphate undergoes a rapid, reversible transition at 1305°C. The high‐temperature β form of pure cannot be quenched to room temperature, even with extremely rapid cooling. Determination of phase relationships on the orthophosphate joins between and each of the three orthophosphates, , , and showed that they form β‐ solid solutions which could be cooled to room temperature to form the basis for the so‐called “modified strontium orthophosphate” phosphors. The ranges of composition and temperature over which the β‐ solid solutions exist were determined for each system, and the existence of two ternary compounds, and , was confirmed. The latter compound has a transition at 1035°C, but the high‐temperature form can be maintained at room temperature only by extremetly rapid quenching. Equilibrium diagrams of each of the systems are presented to show all stability relationships.

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