Yu. L. Tushinova

Phase formation in the Rb2MoO4-Er2(MoO4)3-Hf(MoO4)2 system and the crystal structure of new triple molybdate Rb5ErHf(MoO4)6

AbstractThe subsolidus region of the Rb2MoO4-Er2(MoO4)3-Hf(MoO4)2 ternary salt system is studied using X-ray powder diffraction. A novel 5: 1: 2 triple molybdate, Rb5ErHf(MoO4)6, is found to form in the system. Crystals of Rb5ErHf(MoO4)6 are flux-grown under spontaneous nucleation conditions. The composition and crystal structure of Rb5ErHf(MoO4)6 are refined in a single-crystal X-ray diffraction experiment (X8 APEX diffractometer, MoKα radiation, 1753 reflections, R = 0.0183). The crystals are trigonal; a = 10.7511(1) Å, c = 38.6543(7) Å, V = 3869.31(9) Å3, dcalc = 4.462 g/cm3, Z = 6, space group % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOuaiqaio% dagaqeaiaadogaaaa!3881!

Luminescence of Ln-Zr molybdates

R\bar 3c

Double molybdates of rare earth elements and zirconium

. The mixed three-dimensional framework of the structure is formed of MoO4 tetrahedra, each sharing corners with two ErO6 and HfO6 octahedra. Two types of Rb atoms occupy large cavities of the framework. The distribution of the Er3+ and Hf4+ cation over two positions is refined in the course of structure solution.

Phase relations in the K2MoO4–Ln2(MoO4)3–Zr(MoO4)2 (Ln = La–Lu, Y) systems

Single crystals of binary molybdate Nd2ZrMoO4)9 were grown. The crystal structure of this compound was investigated by X-ray diffraction analysis (CAD-4 diffractometer, MoKα radiation, 2844 reflections. R = 0.0230), and a new type of structure was found. The crystals are trigonal with cell dimensions a = 9.804(1), c = 58.467(12) å, V= 4867(1) å3, Z = 6, dcalc = 4.098 g/cm3, space group R3−c. The structure involves polyhedra of three types: MoO4 tetrahedra, ZrO6 octahedra, and NdO9 tricapped trigonal prisms linked by their common vertices into an original three-dimensional framework.

Phase equilibria in the Li 2 MoO 4 -Ln 2 (MoO 4 ) 3 -Hf(MoO 4 ) 2 (Ln = La-Lu) systems

The crystallographic characteristics and optical and thermal properties of Ln-Zr molybdates synthesized using ceramic technology are described.

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

AbstractInteractions in the ternary system K2MoO4-Lu2(MoO4)3-Hf(MoO4)2 have been studied by X-ray powder diffraction and differential thermal analysis. A new triple (potassium lutetium hafnium) molybdate with the 5: 1: 2 stoichiometry has been found. Single crystals of this molybdate have been grown. Its X-ray diffraction structure has been refined (an X8 APEX automated diffractometer, MoKα radiation, 1960 F(hkl), R = 0.0166). The trigonal unit cell has the following parameters: a = 10.6536(1) Å, c = 37.8434(8) Å, V = 3719.75(9) Å, Z = 6, space group R

Phase formation in the Ln2(MoO4)3-Hf(MoO4)2 (Ln = La-Lu, Y, Sc) systems

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