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  • Inorganic Chemistry  (4)
  • Key words High pressure  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Single-crystal hydrostatic compression of synthetic pyrope, almandine, spessartine, grossular and andradite garnets at high pressures (1999)
    Springer
    Physics and chemistry of minerals 27 (1999), S. 52-58 
    Details
    ISSN: 1432-2021
    Keywords: Key words High pressure ; Single-crystal diffraction ; Garnet ; Bulk modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The compression of synthetic pyrope Mg3Al2 (SiO4)3, almandine Fe3Al2(SiO4)3, spessartine Mn3Al2 (SiO4)3 grossular Ca3Al2(SiO4)3 and andradite Ca3Fe2 (SiO4)3 was studied by loading the crystals together in a diamond anvil cell. The unit-cell parameters were determined as a function of pressure by X-ray diffraction up to 15 GPa using neon as a pressure transmitting medium. The unit-cell parameters of pyrope and almandine were measured up to 33 and 21 GPa, respectively, using helium as a pressure medium. The bulk moduli, K T 0, and their first pressure derivatives, K T 0 ′, were simultaneously determined for all five garnets by fitting the volume data to a third order Birch-Murnaghan equation of state. Both parameters can be further constrained through a comparison of volume compressions between pairs of garnets, giving for K T 0 and K T 0 ′ 171(2) GPa and 4.4(2) for pyrope, 185(3) GPa and 4.2(3) for almandine, 189(1) GPa and 4.2 for spessartine, 175(1) GPa and 4.4 for grossular and 157(1) GPa and 5.1 for andradite, where the K T 0 ′ are fixed in the case of spessartine, grossular and andradite. Direct comparisons of the unit-cell volumes determined at high pressures between pairs of garnets reveal anomalous compression behavior for Mg2+ in the 8-fold coordinated triangular dodecahedron in pyrope. This agrees with previous studies concerning the compression behaviors of Mg2+ in 6-fold coordinated polyhedra at high pressures. The results show that simple bulk modulus–volume systematics are not obeyed by garnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050240
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  • 2
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur einer neuen isomeren Form von As4S4 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 419 (1976), S. 176-184 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of a New Isomeric Form of As4S4As4S4(II) was prepared by melting of the pure elements As and S in the atomic ratio 1:1 at the temperature range 500°-600°C and a quickly cooling to the room temperature. Yellow-orange coloured and very thin platy single crystals were recrystallized from a CS2 solution. The crystal parameters are: a = 11.193, b = 9.994, c = 7.153 Å and β = 92.8°. The space group in P21/n (No. 14).The molecule can be principally deduced from the As4-tetraedron. By the connection of the folded plane SAs3 to the platy pyramide S3As the cage structure of the As4S4(II) molecule will be built.
    Notes: As4S4(II) wird durch Zusammenschmelzen von elementarem As und S im Atomverhältnis 1:1 bei 500-600°C und schnelle Abkühlung erhalten. Aus der Lösung in CS2 rekristallisieren gelb-orangefarbene Einkristalle in Form von sehr dünnen Plättchen. Die Kristallparameter sind a = 11,193, b = 9,994, c = 7,153 Å, β = 92,8°; die Raumgruppe ist P21/n (Nr. 14).Das Molekül kann prinzipiell aus dem As4-Tetraeder abgeleitet werden. Ankopplung eines gewellten SAs3-Vierecks mit einer stumpfen S3As-Pyramide ergibt das Käfigmolekül As4S4 (II).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764190211
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  • 3
    Electronic Resource
    Electronic Resource
    Strukturbestimmungen an nichtlinearen Metallocenen. II. Die Molekül- und KristallStruktur von Benzol-1,2-Dithiolato-di(π-Cyclopentadienyl)-Titan (IV) (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 390 (1972), S. 195-209 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The chelate complex (C5H5)2TiS2C6H4 crystallizes in the centrosymmetric monoclinic soace group P21/c with the cell dimensions a = 14.366 Å, b = 15.380 Å, c = 12.736 Å, β = 90.2° and Z = 8. The S2C6H4 plane of the molecule is folded out of the TiS2 plane by an angle of 46°. The coordination polyhedron around the titanium atom defined by the cyclopentadienyl ring centroids and the sulfur atoms is a distorted tetrahedron of nearly mm2—C2v symmetry. The distances Ti—S and S—C are shorter, then those of single bonds of these atoms. The cyclopentadienyl rings are in staggered or eclipsed arrangement with respect to each another.
    Notes: Der Chelatkomplex (C5H5)2TiS2C6H4 kristallisiert in der zentrosymmetrischen monoklinen Raumgruppe P21/c mit den Gitterkonstanten a = 14,366 Å, b = 15,380 Å, c = 12,736 Á, β = 90,2° und Z = 8. Die S2C6H4-Ebene einer Molekel ist um 46° aus der TiS2-Ebene herausgefaltet. Das durch die Schwerpunkte der Cyclopentadienylringe und der Schwefelatome beschriebene Koordinationspolyeder am Titanatom ist ein deformierter Tetraeder mit annähernd mm2-C2v-Symmetrie. Die Ti—S- und S—C-Abstände sind gegenüber Längen von Einfachbindungen betreffender Atome deutlich verkürzt. Die relative Lage der Cyclopentadienylringe zueinander ist sowohl auf Deckung als auch auf Lücke.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723900208
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Cyclooktadekaschwefel, S18, und Cycloikosaschwefel, S20 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 405 (1974), S. 153-162 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Cyclooctadecasulphur, S18, and Cycloikosasulphur, S20Starting with mixtures of sulfanes and chlorosulfanes new sulfur rings S18 and S20. are synthesized according to \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H}_{\rm 2} {\rm S}_{\rm x} \, + \,{\rm Cl}_{\rm 2} {\rm S}_{\rm y} \, \to \,{\rm 2}\,{\rm HCl}\,\, + \,{\rm S}_{{\rm x} + {\rm y}}. $$\end{document} The new compounds are remarkable stable. Preparation of the starting materials as well as the structure determinations by X-rays are reported.
    Notes: Aus Gemischen von Sulfanen mit Chlorsulfanen werden nach \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H}_{\rm 2} {\rm S}_{\rm x} \, + \,{\rm Cl}_{\rm 2} {\rm S}_{\rm y} \, \to \,{\rm 2}\,{\rm HCl}\,\, + \,{\rm S}_{{\rm x} + {\rm y}} $$\end{document} die neuen Schwefelringe S18 und S20 erhalten. Sie sind bemerkenswert beständig. Die Synthese der Ausgangsmaterialien sowie die Strukturbestimmungen der neuen Verbindungen werden mitgeteilt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744050204
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  • 5
    Electronic Resource
    Electronic Resource
    Die CuAllnO4-Struktur - röntgenographische und spektroskopische Untersuchungen an Verbindungen MIIMeIIIInO4 [MII: Mn2+-Zn2+; MeIII: Al, Ga]Professor Walter Rüdorff zum 70. Geburtstage am 3. Oktober 1979 gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 456 (1979), S. 130-146 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of CuAlInO4 - Structural and Spectroscopic Investigation on Compounds MIIMeIIIInO4 [MII: Mn2+ -Zn2+; MeIII: Al, Ga]A single crystal X-ray analysis of CuAlInO4 yielded a monoclinic structure [space group: Cm; am = 572.8(3) pm, bm = 330.9(2) pm, cm = 835.2(3) pm, β = 103.2(2)°; Z = 2], in which Cu2+ and Al3+ possess a distorted trigonal bipyramidal and In3+ an octahedral coordination. In hexagonal description the sequence of oxygen layers is ababcacabcbc with Cu2+ and Al3+ close to those layers, which have a hexagonal packing symmetry, and In3+ between layers of cubic packing sequence. Compounds MIIMeIIIInO4 (MII: Mg2+, Mn2+, Co2+, Cu2+ Zn2+; MeIII: Al3+, Ga3+) have the same structure. Ligand field and EPR spectroscopic results confirm the trigonal bipyramidal coordination of the transition metal ions. The stabilisation of the CuAlInO4- with respect to the spinel structure is discussed on the basis of site preference energies.
    Notes: CuAlInO4 (röntgenographische Einkristall-Strukturanalyse) kristallisiert monoklin [Raumgruppe: Cm; am = 572,8(3) pm, bm = 330,9(2) pm, cm = 835,2(3) pm, β = 103,2(2)°; Z = 2] mit (verzerrt) trigonal-bipyramidaler Koordination von Cu2+ und Al3+ und oktaedrisch koordinierten In3+-Ionen. In pseudohexagonaler Aufstellung (ah = 331 pm, ch = 2 439 pm) ist die Sauerstoff-Schichtenfolge ababcacabcbc mit Cu2+ und Al3+ in der Nähe der hexagonalen und In3+ zwischen den kubisch gestapelten Schichten.Den gleichen Gittertyp besitzen die Verbindungen MIIMeIIIInO4 (MII:Mg2+, Mn2+, Co2+, Cu2+ Zn2+; MeIII: Al3+, Ga3+). Die trigonal-bipyramidale Koordination der Übergangsmetallionen wird durch ligandenfeld- und EPR-spektroskopische Messungen bestätigt. Die Stabilisierung der CuAlInO4-im Vergleich zur Spinellstruktur durch 3dn-Kationen wird auf der Grundlage von „site-preference“-Energien diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794560114
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