Phase Equilibria in the Sr[sub 3](PO[sub 4])[sub 2]-Cd[sub 3](PO[sub 4])[sub 2] System and Eu2+-Activated Luminescence of Sr[sub 3](PO[sub 4])[sub 2] and Related Phases
| Autor: | James R. Looney, Jesse J. Brown |
|---|---|
| Rok vydání: | 1971 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Analytical chemistry Phosphor Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Reaction temperature chemistry Ternary compound Phase (matter) Materials Chemistry Electrochemistry Melting point Luminescence Eutectic system Solid solution |
| Zdroj: | Journal of The Electrochemical Society. 118:470 |
| ISSN: | 0013-4651 |
| DOI: | 10.1149/1.2408084 |
| Popis: | The phase equilibria relationships in the system were established in air using DTA and melting point data obtained from compositions previously equilibrated by solid‐state reactions. In addition to the previously reported rapid, reversible polymorphic inversion at 1305°C (1), a second rapid reversible transition was found to occur at 1410°C prior to melting at 1620°C. is soluble in: (a) to a maximum of 1 or 2 m/o (mole per cent), (b) to a maximum of 21 m/o at 1075°C with 12 m/o sufficient to stabilize the β‐phase to room temperature, and (c) to a maximum of 31 m/o at 1125°C. A eutectoid reaction exists at 1075°C where solid solution, solid solution, and a ternary compound are in equilibrium. is soluble in to a maximum of about 3 m/o at 1050°C. The luminescence of Eu2+‐activated is very dependent on composition and the polymorph present at the reaction temperature. Small additions of to all polymorphs rapidly quench the luminescence. Although both high‐temperature forms of revert to the α‐modification upon cooling to room temperature, phosphors prepared by solid‐state reaction in the temperature stability range of possess superior brightness levels. |
| Databáze: | OpenAIRE |
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