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Issue 32, 2015
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BaGa4O7, a new A3BC10O20 crystalline phase: synthesis, structural determination and luminescence properties

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Abstract

The synthesis, structural determination and luminescence properties of a new barium gallate, BaGa4O7, are reported. This crystalline material can uniquely be obtained by direct cooling from the molten state. The crystallographic structure was determined using a combination of electron, synchrotron and neutron powder diffraction data. BaGa4O7 crystallizes in the monoclinic I2/m space group with a = 15.0688(1) Å, b = 11.7091(1) Å, c = 5.1429(2) Å and β = 91.0452(2)° and can be described as an original member of the A3BC10O20 family. Atypical for this A3BC10O20 structural framework, BaGa4O7 is found to contain exclusively divalent and trivalent cations. In order to maintain overall electroneutrality, disordered defect-type partial substitution of gallium and oxygen ions on barium sites occurs within the pentagonal channels of BaGa4O7. Thanks to the flexibility of this structural framework, BaGa4O7 can be heavily doped with europium and thus is shown to exhibit strong orange-red luminescence emission at 618 nm under 393 nm excitation.

Graphical abstract: BaGa4O7, a new A3BC10O20 crystalline phase: synthesis, structural determination and luminescence properties

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Publication details

The article was received on 05 Jun 2015, accepted on 04 Jul 2015 and first published on 07 Jul 2015


Article type: Paper
DOI: 10.1039/C5CE01101A
Citation: CrystEngComm, 2015,17, 6127-6135
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    BaGa4O7, a new A3BC10O20 crystalline phase: synthesis, structural determination and luminescence properties

    M. Boyer, E. Véron, A. I. Becerro, F. Porcher, M. R. Suchomel, G. Matzen and M. Allix, CrystEngComm, 2015, 17, 6127
    DOI: 10.1039/C5CE01101A

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