Na+-beta''-alumina crystals are synthesized by a flux evaporation technique. An ion exchange procedure is given for the preparation of lanthanide ion exchanged Na+-beta''-Al2O3 crystals. Impedance spectroscopy measurements showed a lanthanide ion mobility in the high temperature region (T > 500 K). The ionic conductivity is lowered with decreasing radii of the incorporated lanthanide ions. The magnetic behaviour of a highly Pr3+-exchanged Na+-beta''-Al2O3 single crystal has been investigated. The experimental data show strong anisotropic behaviour. From the magnetic data a preferential sire occupancy of the Pr3+ ions at the mO site was derived. The influence of the coordination geometry on the magnetic properties is investigated by ligand-field calculations applying the angular overlap model (AOM).

The Na+ ions in the solid electrolyte β″alumina (Na+-β″-Al2O3) have been exchanged with Pr3+ ions. The Pr3+ ion has been used as an optical and magnetic probe to investigate the local structure within the conduction planes of this oxide. With this aim, optical spectra and susceptibility measurements have been carried out. Both fluorescence and excitation spectra, related to the 3Po→3F2, 3H4 transitions, have been recorded on single crystals. The magnetic susceptibility shows temperature-independent paramagnetism at low temperatures. The physical properties have been interpreted with the help of ligand-field calculations by applying the angular overlap model. It has been deduced that the Pr3+ ions occupy mostly the eightfold-coordinated mid-oxygen (mO) sites.

The magnetic behaviour of polycrystalline Na+/Pr3+ - beta'' - Al2O3 samples with various exchange rates has been studied. Magnetic measurements were recorded with a SQUID magnetometer in the temperature range 1.7-300 K at various field strengths. The data were interpreted by ligand-field calculations applying the angular overlap model (AOM). The calculations are based on angular overlap parameters obtained from optical investigations on Na+/Pr3+ - beta - Al2O3.

Angewandte ChemieVolume 107, Issue 1 p. 97-99 Zuschrift Na2Ti3Cl8: von isolierten Ti2+-Ionen zu [Ti3]6+-Clustern† Dr. Dirk J. Hinz, Dr. Dirk J. Hinz Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorProf. Dr. Gerd Meyer, Corresponding Author Prof. Dr. Gerd Meyer Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorDipl.-Chem. Thorsten Dedecke, Dipl.-Chem. Thorsten Dedecke Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorProf. Dr. Werner Urland, Corresponding Author Prof. Dr. Werner Urland Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this author Dr. Dirk J. Hinz, Dr. Dirk J. Hinz Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorProf. Dr. Gerd Meyer, Corresponding Author Prof. Dr. Gerd Meyer Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorDipl.-Chem. Thorsten Dedecke, Dipl.-Chem. Thorsten Dedecke Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this authorProf. Dr. Werner Urland, Corresponding Author Prof. Dr. Werner Urland Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Institut für Anorganische Chemie der Universität, Callinstraße 9, D-30167 Hannover, Telefax: Int. + 511/762-3006Search for more papers by this author First published: 5 January 1995 https://doi.org/10.1002/ange.19951070122Citations: 9 † Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. AboutPDF ToolsRequest permissionAdd to favorites ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article.Citing Literature Volume107, Issue15 January 1995Pages 97-99 This is the German version of Angewandte Chemie. Note for articles published since 1962: Do not cite this version alone. Take me to the International Edition version with citable page numbers, DOI, and citation export. We apologize for the inconvenience. RelatedInformation

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Magnetic susceptibility measurements and neutron powder diffraction were performed on orthorhombic Na2TiCl4. The Ti2+ ions occupy compressed Cl6 octahedra sharing common edges to form Ti-Cl chains along the c-axis. The powder susceptibility can be fitted using a one-dimensional S = 1 Heisenberg model with |J|/kB = (58 ± 5)K plus a Curie-Weiss contribution. Below TN = (13.0 ± 0.5)K, magnetic superstructure reflections show the onset of 3d antiferromagnetic order with μ = (0.89 ± 0.05)μB at 1.8 K.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Na2TiCl4 is obtained as single crystals by metallothermic reduction of TiCl3 with sodium (525-degrees-C, 90 d, Ta container). Pure powder samples may be prepared by synproportionation of TiCl3 with Ti in the presence of NaCl (950-520-degrees-C, 21 d). The structure refinement from four-circle diffractometer data confirms that Na2TiCl4 is isotypic with Sr2PbO4 (orthorhombic, space group Pbam (No. 55), Z = 2 a = 694.2(1), b = 1 198.9(2), c = 385.6(1) pm, R = 0.055, R(w) = 0,038). Ti2+ is surrounded by a distorted octahedron of Cl-. The octahedra are connected via common edges to chains, 1infinity[TiCl2/1Cl4/2]2-, that run in the [001] direction. Magnetic susceptibility data were recorded in the 2 to 300 K temperature range at various field strengths. The interpretation of the data was carried out with the aid of crystal-field calculations taking magnetic interactions into account. The non-Curie behaviour of the reciprocal magnetic susceptibility of Ti2+ in Na2TiCl4 is due to the influence of spin-obit coupling.