KEu(MoO4)2: Polymorphism, Structures, and Luminescent Properties
作者： Vladimir A. Morozov , Alla V. Arakcheeva , Philip Pattison , Katrien W. Meert , Philippe F. Smet
DOI: 10.1021/ACS.CHEMMATER.5B01622
关键词:
摘要: In this paper, with the example of two different polymorphs KEu(MoO4)2, influence ordering A-cations on luminescent properties in scheelite related compounds (A′,A″)n[(B′,B″)O4]m is investigated. The were synthesized using a solid state method. study confirmed existence only polymorphic forms at annealing temperature range 923–1203 K and ambient pressure: low anorthic α-phase monoclinic high β-phase an incommensurately modulated structure. structures both solved transmission electron microscopy refined from synchrotron powder X-ray diffraction data. β-KEu(MoO4)2 has (3+1)-dimensional structure (superspace group I2/b(αβ0)00, = 5.52645(4) A, b 5.28277(4) c 11.73797(8) γ 91.2189(4)o, q 0.56821(2)a*–0.12388(3)b*), whereas commensurately I1(αβγ)0, 5.58727(22)...
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