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 5D0→7F2 transition is observed. The ultranarrow 5D0→7F0 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.