[en] According to powder data (Guinier-Simon) Na₁₄Cd₂O₉ is isotypic to Na₁₄Mn₂O₉ and crystallizes trigonal in P3 with a = b = 6.75, c = 9.43 A, Z = 1. The Madelung Part of Lattice Energy, MAPLE, is calculated. (author)

[en] The yellow Ba₈Re₂W₃vacant₃O₂₄ crystallizes in a rhombohedral layer structure of 24 L-type with a = 5.81₃ A; c = 55.52₅ A for the unit cell in trigonal setting and 3 formula units in the cell (rhosub(gef.) = 7.2₆ g/cm³; rhosub(ber.) = 7.37₈ g/cm³). (author)

[en] The formation of the new compound SrCl₂.1/2H₂O was detected with help of high-temperature X-ray and high-temperature Raman measurements. Strontium chloride hemihydrate was prepared by dehydration of the higher hydrates in a water-vapour atmosphere of 1 bar at 165 ⁰C. The course of dehydration of SrCl₂.6H₂O, and SrCl₂.2H₂O is discussed. X-ray, i.r.-and Raman data of SrCl₂.1/2H₂O and SrCl₂.H₂O are reported. SrCl₂.H₂O crystallizes orthorhombic in the BaCl₂.H₂O type (space group Pnma) with a = 1088.1(1), b = 416.2(1), and c = 886.4(1) pm. The water modes of the hydrates as well as the force constants and bond energies of the hydrogen bridges are discussed. (author)

[en] By means of the reactions of MCl₄ (M = Ti and Zr) with IOCN, the compounds TiCl₃NCO and ZrCl₃NCO are respectively obtained. Their vibrational spectra are recorded, and of them is infered that the coordination of the cyanate group to the metal takes place through the atom of nitrogen, belonging both compounds to the Csub(3v) symmetry group. (author)

[en] The white Ba₆W₄vacant₂O₁₈, with a cation/vacancy ratio of 2:1 for the octahedral holes, is the first representative of a new stacking polytype for this formula type. It crystallizes in a rhombohedral six layer-structure with asub(hex) = 10.13 A; csub(hex) = 13.96 A; Z = 3 (rhosub(exp) = 7.3 g/cm³; rhosub(calc) = 7.41 g/cm³). (author)

[en] For the first time SrV₈³⁺V₂²⁺O₁₅ was prepared and investigated by X-ray single crystal data (space group Dsub(2h)¹⁸-Ccmb, a = 991.5; b = 1157.4; c = 932.4 pm, Z = 4). The structure of SrV₁₀O₁₅ consists of an V³⁺/V²⁺-O^2- octahedral framework with a large cavity built up from 12 VO₆ octahedra. The resemblance of the V₁₂O₅₀ groups in respect to the polyacids is discussed. (author)

[en] The Chemical Transport Reaction method (CTR) has been applied to get layer monocrystals of MoS₂ using Br₂, GeBr₂ and SnBr₂ as transport agent, respectively. The S:Mo ratio in the deposited solids is not significant greater than 2:1 even in the case of a sulphur excess in the vapour. Measurements of the sulphur pressure above MoS₂ + S indicate the solubility of sulphur in MoS₂. According to these measurements neither Mo₂S₅ nor MoSsub(n) with n > 3 exist between 400 ⁰C and 520 ⁰C. The Mo₂Ssub(3-delta)-phase with 0.008 <= delta <= 0.036 can also be obtained by CTR. Mo₃S₄, however, decomposes at the transport temperature. CTR experiments result in the deposition of Mo₂S₃ and crystalline MoSX (X = Cl, Br). (author)

[en] The hitherto unknown single crystals of CoNbO₄ were prepared. CoNbO₄ has AlNbO₄ structure with monoclinic symmetry (space group Csub(2h)³ - C2/m; a = 1212.9; b = 374.9; c = 651.2 pm; β = 107.6⁰). X-ray investigations show an ordered arrangement of Co³⁺ and Nb⁵⁺ with well defined differences in respect to oxocobaltates with Columbite type (CoNb₂O₆ = Cosub(0.33)Nbsub(0.66)O₂) and Rutil type (CoNbO₄ = Cosub(0.5-x)Nbsub(0.5+x)O₂; 0 <= x <= 0.166) structure. (author)

[en] RE³⁺ ions are introduced into cation positions within the large cavaties, if about 25 equiv. per cent of Ca²⁺ ions in CaNaY zeolites are reexchanged by RE³⁺ ions. In this process the concentration of hydroxide groups doubles nearly. The newly formed hydroxide groups are lattice OH groups and possess an acid strength in the pKsub(a) region -8.2 to -5.6. (author)

[en] The preparation of Cs₂KYF₆: Eu, Tb is described in detail and the particular suitability of the resulting products for spectroscopical measurements is proved by their well resolved bands in the fluorescence spectra. Following the interpretation of the emission spectra of Cs₂NaEuCl₆ and Cs₂NaTbCl₆ the observed O-O transitions of magnetic dipole and electric quadrupole character respectively can be assigned. A closer analysis of the vibronic transitions of Cs₂NaYsub(0.99)Eusub(0.01)F₆ allows a determination of the energies of some vibrational states of odd parity. (author)