Tm,Ho:Ca(Gd,Lu)AlO4 crystals: Crystal growth, structure refinement and Judd-Ofelt analysis

Judd-Ofelt Analysis of Nd(TTA)3Phen-doped 6-FDA/Epoxy Planar Waveguides

The fluorescent complex Nd(TTA)3Phen (TTA = thenoyltrifluoroacetone, Phen = 1, 10-phenanthroline), was doped into the host material 6-FDA epoxy (6-fluorinated-dianhydride cured epoxy). The room-temperature absorption spectrum of Nd transitions was experimentally obtained, with which the Judd-Ofelt model was applied to determine the Judd-Ofelt parameters. These parameters are used to calculate t...

Asbecasite: crystal structure refinement and crystal chemistry

The crystal structure of antimonian asbecasite in an ejectum of hypabyssal origin occurring at Tre Croci near Vetralla, Vico volcanic complex, Roman potassic province, Latium, Italy, has been refined to R = 0.042, and is compared to the original crystal structure determination carried out on the Sb-free asbecasite of hydrothermal metamorphic origin from the type-locality, Cherbandung in Binna v...

Crystal growth, structure and physical properties of crystals

Vesuvianite is an ortho-diorthosilicate of a general schematic formula X~19Y13Z18O68W10, where X – Ca and other cations, which occupy sites of coordination number 8, Y – cations occupying octahedrons and pentagonal polyhedrons: Al, Fe, Mg, Ti, etc., Z – Si in tetrahedrons, W – univalent and bivalent anions. Structures of vesuvianites are studied in dependence on a character of cation ordering i...

Crystal structure refinement of matlockite

Crystal structure refinement with SHELXL

The improvements in the crystal structure refinement program SHELXL have been closely coupled with the development and increasing importance of the CIF (Crystallographic Information Framework) format for validating and archiving crystal structures. An important simplification is that now only one file in CIF format (for convenience, referred to simply as `a CIF') containing embedded reflection ...