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

Abstract

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) Å 3 , Z=4 (RB=0.86%). This molybdate possesses its phase transition at 817 K and melts at 1250K. The Raman spectra were measured with the excitation at =1064 and 514.5nm. The photoluminescence spectrum is evaluated under the excitation at 514.5nm. The absolute domination of hypersensitive 5 D0→ 7 F2 transition is observed. The ultranarrow 5 D0→ 7 F0 transition in RbEu(MoO4)2 is positioned at 580.2nm being 0.2nm blue shifted, with respect to that in Eu2(MoO4)3.

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

“…As it is known from the reported results, the initial material granules, under certain conditions, are able to maintain the original shape and size in the thermal decomposition process [28][29][30]. At the same time, the compounds with the stoichiometric lanthanide ion content attract attention in order to find efficient luminescent materials with low concentration quenching and to investigate specific mechanisms of luminescence quenching in them [31][32][33][34][35][36][37][38][39][40]. At the same time, the consideration of lanthanide-containing materials cannot be restricted only by their luminescent properties.…”

Gd2Zr3(MoO4)9 microwave dielectric ceramics with trigonal structure for LTCC application

“…Because of overlapping features or the intensity of weak modes below the detection limit in Raman spectra, only qualitative analysis of the spectrum was implemented. The spectrum of Gd 2 Zr 3 (MoO 4 ) 9 ceramic has a broad gap between low frequency and high frequency modes and the intensive line in measured spectral range were also observed in analogy molybdate such as Zr(MoO 4 ) 2 , ZrMgMo 3 O 12 , Y 2 Mo 3 O 12 , Eu 2 (MoO 4 ) 3 , RbEu(MoO 4 ) 2 , NaSrLa(MoO 4 ) 3 . The primary bands in the range of 900‐1050 cm −1 , 750‐900 cm −1 , 320‐400 cm −1 , and 280‐320 cm −1 originated from vibrations of MoO4 tetrahedron (corresponding to symmetric stretching, asymmetric stretching, symmetric bending and asymmetric bending vibrations) .…”

“…Raman spectroscopy is a valid method to estimate the crystal structure evolution, order degree, phase composition, and structure‐properties relationship in various system . However, there was no relevant analysis about the Raman vibration of Ln 2 Zr 3 (MoO 4 ) 9 ceramics.…”

“…Raman spectroscopy is a valid method to estimate the crystal structure evolution, order degree, phase composition, and structure-properties relationship in various system. 5,[43][44][45][46][47] However, there was no relevant analysis about the Raman vibration of Ln 2 Zr 3 (MoO 4 ) 9 ceramics. With use of the group theory, the classification of Raman modes in certain structure can be carried out.…”

A novel stibium phosphate, LiBa(SbO)2(PO4)3: synthesis, crystal structure and RE3+-activated (RE = Tb3+ and Eu3+) fluorescence performance

“…Furthermore, the [(SbO) 2 (PO 4 ) 3 ] 1 net delimits 1D infinite chains in which the Li + and Ba 2+ ions reside to ensure the cohesion and the neutrality of the structure of LiBa(SbO) 2 (PO 4 ) 3 . The Li1 atom is tetracoordinated by O atoms in a distorted tetrahedral geometry, with Li-O bond lengths of 1.865 (18)-2.136 (17) Å (Atuchin et al, 2019). Alternatively, there exists a weak Li-O contact of 2.495 (17) Å which can be thought as the secondary bond to compensate the coordination number to five.…”