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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 593 (1991), S. 17-34 
    ISSN: 0044-2313
    Keywords: Cesium Lithium Orthotitanate, Silicate ; Crystal Structure ; Schlegel Diagrams ; MAPLE Calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Isotypism of Titanates and Silicates: About Cs2Li2[SiO4] and Cs2Li2[TiO4]For the first time colourless single crystals of Cs2Li2[SiO4] have been prepared by heating of a well ground mixture of the binary oxides CsO0.67, LiO0.5 and SiO2[Cs:Li:Si = 2.2:2.0:1.0; 450°C; 21 d] in tightly closed Ni tubes. The new oxosilicate crystallizes triclinic (space group P1 with a = 959.6(3), b = 577.4(2), c = 558.1(2) pm, α = 92.52(3)°, β = 110.93(3)°, γ = 94.45(3)°, Guinier-Simon powder data). The crystal structure was determined by four-circle diffractometer data [Siemens AED 2, 1612 I°(hkl), Z = 2, R = 7.2%, Rw = 6,5%], parameters see text.Cs2Li2[TiO4] has also been prepared as colourless single crystalls from CsO0.56, LiO0.5 und TiO2 (Cs:Li:Ti = 2.3:2.2:1.0; 650°C; 68 d, Ni tube) and investigated by x-ray [four-circle diffractometer data, Philips PW 1100, 2193 from 2383 I°(hkl). Z = 2, R = 7.6%, Rw = 6.1%, space group P1 with a = 951.0(1), b = 594.5(1), c = 582.6(1) pm, α = 93.11(1)°, β = 110.37(1), γ = 95.04(1)°, Guinier-Simon powder data]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, have been calculated. A detailed comparison of the structures is carried out.
    Notes: Erstmals wurden farblose Einkristalle von Cs2Li2[SiO4] durch Tempern inniger Gemenge der binären Oxide CsO0,67, LiO0,5 und SiO2 [Cs:Li:Si = 2,2:2,0:1,0; 450°C; 21 d] in fest verschlossenen Ni-Bömbchen erhalten. Es liegt Isotypie mit Rb2Li2[MO4] (M = Si, Ge, Ti) vor: triklin (Raumgruppe P1) mit a = 959,6(3) pm, b = 577,4(2) pm, c = 558,1(2) pm, α = 92,52(3)°, β = 110,93(3)°, γ = 94,45(3)°, (Guinier-Simon-Daten). Die Kristallstruktur wurde mittels Vierkreisdiffraktometerdaten aufgeklärt [Siemens AED 2, 1612 I°(hkl), Z = 2, R = 7,2%, Rw = 6,5%], Parameter siehe Text.Ebenfalls neu wurde Cs2Li2[TiO4] in Form farbloser Einkristalle durch Tempern inniger Gemenge von CsO0,56, LiO0,5 und TiO2 [Cs:Li:Ti = 2,3:2,2:1,0; 650°C; 68 d, Ag-Bömbchen] dargestellt und röntgenographisch untersucht. Die Strukturverfeinerung [Vierkreisdiffraktometerdaten, Philips PW 1100, 2193 von 2383 I°(hkl), Z = 2, R = 7,6%, Rw = 6,1%, Raumgruppe P1 mit a = 951,0(1) b = 594,5(1), c = 582,6(1) pm, α = 93,11°(1), β = 110,37(1)°, γ = 95,04(1)° Guinier-Simon-Daten] bestätigt auch hier Isotypie mit Rb2Li2[SiO4]. Der Madelunganteil der Gitterenergie, MAPLE, sowie Effektive Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, wurden berechnet. Für die nun bekannten Vertreter dieses Typs wurde ein Isotypievergleich vorgenommen.
    Additional Material: 8 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 87-94 
    ISSN: 0044-2313
    Keywords: Potassium Sodium Oxoberyllate ; Single Crystal Structure ; Schlegel Diagrams ; MAPLE Calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On K2Na4[O2BeOBeO2]For the first time colourless single crystals of K2Na4[Be2O5] which are isotypic with K2Na4[Co2O5] [2] and Rb2Na4[Co2O5] have been prepared by heating e.g. a well ground mixture of K2O, Na2O and BeO (K:Na:Be = 2.2:4.4:2; 750°C; 21 d; Ni-tube). The crystal structure was solved by four-circle diffractometer data [Siemens AED 2; 389 Io(hkl); space group P42/mnm; Z = 2; a = 595.17(4) pm, c = 1 002.66(9) pm; R = 4.1%; Rw = 2.3%].Mean Fictive Ionic Radii, MEFIR, Effective Coordination Numbers, ECoN, the Madelung Part of Lattice Energy, MAPLE, and the charge distribution are calculated.
    Notes: Erstmals wurde K2Na4[Be2O5], mit K2Na4[Co2O5] [2] und Rb2Na4[Co2O5] isotyp, in Form farbloser Einkristalle aus Gemengen von K2O, Na2O und BeO (K:Na:Be=2,2:4,4:2; 750°C; 21 d; Ni-Bombe), dargestellt. Die Kristallstruktur wurde über Vierkreisdiffraktometerdaten [Siemens AED 2; 389 Io(hkl); Raumgruppe P42/mnm; Z = 2; a = 595,17(4) pm, c = 1 002,66(9)pm; R = 4,1%; Rw = 2,3%] aufgeklärt. Mittlere Fiktive Ionenradien, MEFIR, Effektive Koordinationszahlen, ECoN, der Madelunganteil der Gitterenergie, MAPLE, sowie die Ladungsverteilung, wurden berechnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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