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Ba2.2Ca0.8Mg4F14, a new “solid solution stabilized” matrix for an intense blue phosphor

Pantazi, M.
Published in Crystal Research and Technology. 2011, vol. 46, no. 9, p. 899-905
Abstract Barium calcium magnesium fluoride (Ba2(BaxCa1-x)Mg4F14, x=0.19-0.26) has been synthesized at 850 °C from precursors prepared by the solution precipitation method. Single crystals with composition of Ba2.200(2)Ca0.800(2)Mg4F14were obtained after prolonged heating. Lattice parameters from single crystal data are a = 12.4203(8) and c = 7.4365(5) Å [tetragonal, space group P42/mnm (No. 136)]. They increase with increasing barium concentration within a given stability window. The structure is built of a network of MgF6 octahedra forming a pyrochlore related channel system and isolated fluorine ions. Within the channels, heavy alkaline earth ions are located. The wide channel is filled with off-center positioned barium ions. The channel with a narrow cross section hosts both ions, Ca2+and Ba2+. The structure is isotypic with Pb3Nb4O12F2 but has a different coordination around Ba/Ca and Pb, respectively. Doped with ∼1% Eu(II), the compound shows intense blue luminescence under UV activation.
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Other version: http://doi.wiley.com/10.1002/crat.201000624
Research group Groupe Hagemann
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KUBEL, Frank, PANTAZI, M., HAGEMANN, Hans-Rudolf. Ba2.2Ca0.8Mg4F14, a new “solid solution stabilized” matrix for an intense blue phosphor. In: Crystal Research and Technology, 2011, vol. 46, n° 9, p. 899-905. https://archive-ouverte.unige.ch/unige:16784

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Deposited on : 2011-08-19

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