Polymorphism and polymorph-dependent luminescence properties of the first lithium oxonitridolithosilicate LiSiNO:Eu.

Building on studies of monoclinic LiSiNO, a polymorph, β-LiSiNO, with a previously unknown structure type was synthesized. The β-phase crystallizes in the orthorhombic space group (no. 61) with lattice parameters of = 18.

BaAlLiON, the Barium Oxonitridolithoaluminate with a Highly Condensed LiO Tetrahedra Framework.

The new compound BaAlLiON consists of AlO/AlON tetrahedra, 10-fold coordinated Ba cations, and a highly condensed edge- and corner-sharing LiO tetrahedra framework, which leads to a degree of condensation greater than 1. The first barium oxonitridolithoaluminate was synthesized by a high-temperature solid-state reaction in a weld-shut tantalum ampoule and the crystal structure has been determined by single-crystal X-ray diffraction. BaAlLiON crystallizes in the monoclinic space group 2/ (no.

The crystal structure and luminescence properties of the first lithium oxonitridolithosilicate LiSiNO:Eu.

The compound LiSiNO:Eu was synthesized in high temperature solid-state reactions in weld shut tantalum ampules and the crystal structure of LiSiNO has been determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group 2/ (no. 15) with the lattice parameters = 1049.

Li Ba Al Ta N O, the First Barium Nitridoalumotantalate with BCT-Zeolite Type Structure.

Single-crystals of Li Ba Al Ta N O:Eu were synthesized from Ba N , Al O , Li N, Eu O , and lithium metal by a high-temperature solid-state reaction in a weld shut tantalum ampule. The crystal structure of Li Ba Al Ta N O was determined by single-crystal X-ray diffraction and it crystallizes in the orthorhombic space group Pnnm (no. 58) with the lattice parameters a=1006.

Novel Molecular Spectroscopic Multimethod Approach for Monitoring Water Absorption/Desorption Kinetics of CAD/CAM Poly(Methyl Methacrylate) Prosthodontics.

Water absorbed to poly(methyl methacrylate) (PMMA)-based CAD/CAM (computer-assisted design/computer-assisted manufacturing) prosthodontics can alter their properties including hardness and stability. In the present contribution, water absorption and desorption kinetics under defined experimental conditions were monitored employing several supplementary and advanced Fourier transform infrared (FT-IR) spectroscopic techniques in combination with multivariate analysis (MVA). In this synergistic vibrational spectroscopic multimethod approach, first a novel near-infrared (NIR) diffuse fiber optic probe reflection spectroscopic method was established for time-resolved analysis of water uptake within seven days under controlled conditions.