Equilibria and Eu2+ Luminescence of Subsolidus Phases Bounded by Ba[sub 3]MgSi[sub 2]O[sub 8], Sr[sub 3]MgSi[sub 2]O[sub 8], and Ca[sub 3]MgSi[sub 2]O[sub 8]

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Abstract
The incorporation of divalent europium in the compounds , , and produces phosphors of high luminescence yield. These phosphors respond well to both long and short wavelength ultraviolet excitation, as well as to cathode ray bombardment. The peak of the emission band occurs at progressively shorter wavelength and narrows as the radius of the major alkaline earth ion (Ca, Sr, or Ba) is increased. A 1200°C isotherm on compositions intermediate to and shows a complete series of crystalline solutions to exist at this temperature. Using an orthorhombic cell the d‐spacings of the (222) reflection vary continuously from 1.956Aå for for . The emission spectra of these samples, however, vary in a discontinuous manner. Complete crystalline solution is likewise observed in a 1200°C isotherm for compositions intermediate to and . Here the d‐spacings of the (222) reflection from the orthorhombic cell vary continuously from 1.909Aå for to 1.956Aå for . Again the peak of the emission spectra varies discontinuously with composition even for the complete crystalline solution series.

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