N. N. Chudinova

Synthesis and crystal structures of lithium polyphosphates, LiPO3, Li4H(PO3)5, and LiMn(PO3)3

AbstractPolyphosphates of the compositions LiPO3, Li4H(PO3)5, and LiMn(PO3)3 were prepared by the reactions of Li2CO3 and MnO2 with melts of polyphosphoric acids at 240–350°C, and their crystal structures were established. The unit-cell parameters are a = 13.074 Å, b = 5.4068 Å, c = 16.452 Å, β = 99.00°, sp. gr. P2/n; a = 6.6434 Å, b = 7.253 Å, c = 11.399 Å, α = 72.60°, β = 83.36°, γ = 85.32°, sp. gr.;

Luminescent properties of Yb3+-doped hexagonal Ln3BWO9 (Ln = Gd, Y)

P\bar 1

Synthesis and structure of the CsSmP4O12 cyclotetraphosphate (cubic CsNdP4O12 structure)

; a = 8.364 Å, b = 8.561 Å, c = 8.6600 Å, sp. gr. P212121, respectively. The influence of cations on the structures of the compounds is discussed.

Specific features of the crystal structure of erbium polyphosphate of the structural type C

The mixed phosphates TlMn2+P3O9(a= 9.422 Å, b= 7.3199 Å, c= 12.227 Å sp. gr. Pnma), TlGaHP3O10(a= 12.01 Å, b= 8.471 Å, c= 9.098 Å, β = 111.98° sp. gr. C2/c), and TlTa(PO4)2(a= 5.0308 Å, c= 8.497 Å sp. gr. P321) were obtained by precipitation from polyphosphoric-acid melts containing di-, tri-, and pentavalent cations in combination with Tl+. The crystal structures of TlMn2+P3O9and TlTa(PO4)2were determined by single-crystal x-ray diffraction.

Nanostructuring in the Process of the Formation of Mixed-Anion Compounds: Rare-Earth Borogermanates, Germanophosphates, and Borotungstates

We report the synthesis and spectroscopic characterization of polycrystalline Yb3+-doped (1, 2, and 5 at %) Ln3BWO9 (Ln = Gd and Y) borotungstates as candidate gain media for diode-pumped near-IR and visible solid-state lasers. Unpolarized luminescence and absorption spectra for the Yb3+2F7/2→2F5/2 transition are measured at T = 77 and 300 K, the lifetime of the 2F5/2 excited state is determined, and the emission cross section of the stimulated Yb3+2F5/2→2F7/2 transition in these compounds is evaluated. Offering a combination of nonlinear optical and lasing properties, the Ln3BWO9 (Ln = Gd, Y) hexagonal borotung-states can be used as bifunctional media for diode-pumped lasers with nonlinear laser frequency self-conversion.

Mixed-Cation Cyclohexaphosphates: Synthesis and Crystal Structure of CsCuInP6O18-II

The double polyphosphate CsMn(PO3)4 was prepared by crystallization from molten polyphosphoric acids containing cesium and manganese cations, and its crystal structure was determined: monoclinic cell, sp. gr. P21 , Z = 2, a= 5.212 Å,b= 13.581 Å, c = 7.394 Å, β = 102.11°. This compound has no structural analogs.

Cationic networks in the structures of borates, tungstates, and borotungstates forming in the Ln2O3-B2O3-WO3 systems

AbstractCsSmP4O12 crystals have been prepared at 300°C in molten polyphosphoric acids containing Cs, Mg, and Sm cations, and their crystal structure has been determined: sp. gr. I