The crystal structure of p-[Ag4Te] [NO312 has been determined by Patterson and Fourier syntheses and least-squares refinement. Three-dimensional intensity data were obtained with an automatic singlecrystal diffractometer. The structure consists of distorted tetrakaidecahedra TeAg9 connected at the corners and edges and forming a three-dimensional framework. Holes in this framework are filled with nitrate ions.
Einleitung
The crystal structure of AgsS2SiO4 has been determined by Patterson and Fourier syntheses and leastsquares refinement (final R value: 5.1%). Three-dimensional intensity data were obtained with an automatic single-crystal diffractometer. The compound is tetragonal, space group 14damd (D~49) with four formula units per unit cell; a = 7.005 (5), c = 17.75 (3) A,. The silver sublattice of AgsSzSiO4 may be described as a distorted and expanded superlattice of the structure of metallic silver. The octahedral holes of this packing are partially occupied, in an ordered way, by sulphur atoms or silicate groups. The structure contains two rather short silver-sulphur bonds of 2.17 (9) A,.
The crystal structure of KSnF3.½H20 has been determined by Patterson and Fourier syntheses. The structure consists of distorted tetragonal pyramids SnF4 with Sn at the top. These pyramids are connected at corners to chains parallel to e. Two channels are formed, one of which is empty and shows small Sn-Sn distances; the second channel is filled with water molecules. Potassium is surrounded by 9 F atoms and one H20.
Es wurde untersucht, welche kristallinen Verbindungen sich in natronalkalischen Aluminatlösungen aus TiO2 und Ca(OH)2 bei 100°C unter Normaldruck bilden.
Bei niedrigen Alkalikonzentrationen entsteht das Calciumaluminat 3 CaO · A12O3 · 6 H2O. Zwei verschiedene Calciumtitanate, darunter Perowskit CaTiO3, lassen sich bei mittleren Alkaligehalten der Lösungen nachweisen, während aus hochalkalischen Lösungen das Natriumtitanat Na2TiO3 kristallisiert.
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