Exploration of structural, vibrational and spectroscopic properties of self-activated orthorhombic double molybdate RbEu(MoO4)(2) with isolated MoO4 units

Atuchin, Victor V.; Aleksandrovsky, Aleksandr S.; Bazarov, Bair G.; Bazarova, Jibzema G.; Chimitova, Olga D.; Denisenko, Yuriy G.; Gavrilova, Tatyana A.; Krylov, Alexander S.; Maximovskiy, Eugene A.; Molokeev, Maxim S.; Oreshonkov, Aleksandr S.; Pugachev, Alexey M.; Surovtsev, Nikolay V. Source: JOURNAL OF ALLOYS AND COMPOUNDS, 785 692-697; 10.1016/j.jallcom.2019.01.013 MAY 15 2019

RbEu(MoO4)2 is synthesized by the two-step solid state reaction method. The crystal structure of RbEu(MoO4)2 is defined by Rietveld analysis in space group Pbcn with cell parameters a = 5.13502(5), b = 18.8581(2) and c = 8.12849(7) Å, V = 787.13(1) Å3, Z = 4 (RB = 0.86%). This molybdate possesses its phase transition at 817 K and melts at 1250 K. The Raman spectra were measured with the excitation at λ = 1064 and 514.5 nm. The photoluminescence spectrum is evaluated under the excitation at 514.5 nm. The absolute domination of hypersensitive 5D07F2 transition is observed. The ultranarrow 5D07F0 transition in RbEu(MoO4)2 is positioned at 580.2 nm being 0.2 nm blue shifted, with respect to that in Eu2(MoO4)3.