Crystal structure of a new ternary molybdate in the Rb2MoO4-Eu2(MoO4)3-Hf(MoO4)2 system

Crystal structure of a new ternary molybdate Rb5CeZr(MoO4)6

“…The coordination polyhedron of the Rb(2) atom lying on axis 2, comprises 3 pairs of closer oxygen atoms (Rb-О = 2.924(6) Å, 3.069(5) Å, 3.149(4) Å) and three pairs of more remote ones (Rb-О = 3.366(6) Å, 3.390(6) Å, 3.478(7) Å), making a dodecahedron approaching a distorted cuboctahedron. The shapes and sizes of the Rb polyhedra are close to those known in the literature [1][2][3]10].…”

“…to sinters and powdered crystals, which indicated that the composition of the crystals was close to the starting stoichiometry. These data also indicated that ternary molybdate examined is isostructural to Rb 5 LnZr(MoO 4 ) 6 and Rb 5 LnHf(MoO 4 ) 6 compounds (Ln = Ce-Lu), [1,2]. The independent direct structural determination (SHELX-97 package [3]) confirmed the structural identity of these compounds.…”

“…One of the structural features of the 5:1:2 compounds [1,2] containing tri-and tetravalent metals, as well as 5:1:3 compounds [6] involving di-and tetravalent metals, is the statistical disorder of Ⱥ 3+ (or Ⱥ 2+ ) and Zr 4+ (Hf 4+ ) cations over two crystallographic positions. The refinement of the occupation factors of Ɇ(1) and Ɇ(2) positions in these structures has revealed that larger cations preferentially occupy the position with the octahedral Mo environment (M(1)-Mo = 3.723(2) Å).…”

Electronic structure of β-RbNd(MoO4)2 by XPS and XES

“…It is well known that MoO 3 is relatively volatile at high temperatures and, consequently, a partial loss of this component during long time synthesis may induce deviation from the stoichiometry of synthesized compounds [25,26]. To minimize this effect, the multistage method with a step-by-step temperature increase is optimal for complex molybdates synthesis [27][28][29]. Therefore, initially, rubidium and neodymium molybdates were prepared by the routine ceramic technique.…”

Microwave Sol–Gel Synthesis of CaGd2(MoO4)4:Er3+/Yb3+ Phosphors and Their Upconversion Photoluminescence Properties

“…About 15 narrow lines were revealed, and the total Raman line set observed in CaGd 2 (MoO 4 ) 4 is shown in Table . The Raman spectrum of CaGd 2 (MoO 4 ) 4 can be divided into two parts with a wide empty gap of 500–700 cm −1 that is common in the molybdates with MoO 4 tetrahedrons . In the range of stretching vibrations of MoO 4 tetrahedrons (720–960 cm −1 ) seven lines were observed.…”