PHASE EQUILIBRIA AND TIN-ACTIVATED LUMINESCENCE IN STRONTIUM ORTHOPHOSPHATE SYSTEMS

Journal Article · Fri Dec 01 04:00:00 EST 1961 · Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol.

DOI:https://doi.org/10.1149/1.2427964· OSTI ID:4828738

Sarver, J F; Hoffman, M V; Hummel, F A

Strontium orthophosphate undergoes a rapid, reversible transitlon at 1305 deg C. The high-temperature beta form of pure n with extremely rapid cooling. Determination of phase relationships on the orthophosphate joins between Sr/sub 3/(PO/sub 4/)/sub 2/ and each of the three orthophosphates, Mg/sub 3/(PO/sub 4/)/sub 2/, Ca/sub 3/(PO /sub 4/)/sub 2/, and Zn/sub 3/(PO/sub 4/)/sub 2/ showed that they form beta -Sr/sub 3/(PO/sub 4/)/s ub 2/ soild solutions whlch could be cooled to room temperature to form the basls for the so-called modlfied strontium orthophosphate phosphors. The ranges of composition and temperature over which the beta -Sr/sub 3/(PO/sub 4/)/sub 2/ soild solutions exist were determined for each system, and the existence of two ternary compounds, SrMg/sub 2/(PO/sub 4/)/sub 2/ and SrZn/sub 2/(PO/sub 4 /)/sub 2/, was conflrmed. The latter compound has a transition at l035 deg C, but the high- temperature form can be maintained at room temperature only by extremely rapid quenching, Equilibrium diagrams of each of the systems are presented to show all stability relationships. The behavior of tinactlvated beta -Sr/sub 3/(PO/sub 4/ )/sub 2/ soild solution phosphors in each of th e three systems was explored under 2537 a excitatlin, and the relation of phosphor composition to quantum efficiency, brightness, and temperature stability in the lamp-making range was determined. The tin-activated luminescence of the two ternary compositions was investigated using 2537 A,

• Research Organization: Pennsylvania State Univ., University Park
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-003009
• OSTI ID: 4828738
• Journal Information: Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol., Journal Name: Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol. Vol. Vol: 108; ISSN JESOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACTIVATION
ALLOTROPY
CALCIUM PHOSPHATES
CATHODE RAYS
CATHODES
CHEMISTRY
COOLING
ELECTRON BEAMS
EXCITATION
HEAT TREATMENTS
HIGH TEMPERATURE
LATTICES
LUMINESCENCE
MAGNESIUM PHOSPHATES
PHASE DIAGRAMS
QUANTUM MECHANICS
QUENCHING
SOLID SOLUTIONS
STABILITY
STRONTIUM PHOSPHATES
TEMPERATURE
THERMODYNAMICS
TIN
X RADIATION
ZINC PHOSPHATES