Determination of the phase relationships on the Zn3false(PO4)2‐Mg3false(PO4)2 join by the quench method has enabled the previously designated “gamma zinc phosphate” to be identified as a solid solution of zinc orthophosphate in magnesium orthophosphate. Mg3false(PO4)2 takes 95 mole % Zn3false(PO4)2 into solid solution at 1000°C. β‐Zn3false(PO4)2 takes a small amount of Mg3false(PO4)2 into solid solution (about 3 mole % at 1000°) and, in order to satisfy the requirements of the Phase Rule, α‐Zn3false(PO4)2 must take a small amount of Mg3false(PO4)2 into solution. The previously determined Zn3false(PO4)2‐Mn3false(PO4)2 relationships are discussed in terms of the new data for the zinc‐magnesium orthorphosphate system. Solid solution relationships in the system normalMgO‐normalZnO‐P2O5 are diagrammed and discussed.Data on peak emission and brightness of the β‐Zn3false(PO4)2 solid solution and the Mg3false(PO4)2 solid solution were obtained using molar substitutions of manganese as an activator. The brightness of the β‐false(normalZn,normalMg)3false(PO4)2:normalMn solid solutions compares favorably with commercial β‐Zn3false(PO4)2:normalMn phosphors and the N.B.S. standard. The manganese‐activated phosphors near the high zinc end of the Mg3false(PO4)2 solid solution series are very bright relative to the β‐Zn3false(PO4)2:normalMn standard, but they peak near 6280Aå, which may in part account for the higher brightness.
Phase relationships in the system ZnO-P~O5 were determined in air in the range between ZnO and Zn(POs)~, using solid state and quenching methods. Three congruently melting compounds exist, Zn3 (PO~)2, Zn~P~OT, and Zn (PO3)2. The orthophosphate has a sluggish, reversible inversion at 942 ~ and melts at 1060 ~ •176The pyrophosphate undergoes a rapid, reversible inversion at 132 ~ and melts at 1017~The irreversible inversion in the metaphosphate takes place in air in the range between 600 ~ and 700~ depending on the rate of heating of the sample. The low temperature form of the metaphosphate cannot be obtained by heating the high temperature form in air, but glass of the metaphosphate composition will yield a mixture of low and high temperature forms if held at 550~ for 16 hr. Zn(PO~)2 melts at 872~Simple eutectic relationships exist between ZnO and Zn~(PO,)2, Zn~(PO,)~ and Zn2P~O7, and Zn2P_~O7 and Zn (PO~) 2.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.122.253.228 Downloaded on 2015-02-07 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.122.253.228 Downloaded on 2015-02-07 to IP Vol. 105, No. 3 PHASE EQUILIBRIUM IN ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.122.253.228 Downloaded on 2015-02-07 to IP
Phase equilibrium data have been obtained for compositions in the ternary system lying near the Zn3false(PO4)2 compound, particularly those on the orthophosphate join. It was found that “gamma zinc orthophosphate” is a ternary solid solution which has a region of stability on the orthophosphate join ranging from about 5 to about 25 mole % Mn3false(PO4)2 . A definitive x‐ray pattern characteristic of the ternary solid solution series is given. β‐Zn3false(PO4)2 forms an extended series of solid solutions with Mn3false(PO4)2 at temperatures above 940°C. The melting behavior of the β‐Zn3false(PO4)2 solid solution is difficult to determine in air due to the usual change in oxidation state of manganese at temperatures above 1000deg;C.Emission curves for cathode ray excitation are presented forα andβ zinc orthophosphate, the so‐called “γ‐zinc phosphate,” Zn2P2O7 , and the two forms of normalZnfalse(PO3)2 .
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