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  • 1
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 505-512 
    ISSN: 0887-6266
    Keywords: ferroelectric copolymers ; Brillouinspectroscopy ; irradiation ; acoustic properties ; molecular orientation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Acoustic, opto-acoustic, and x-ray investigations have been performed in order to study the influence of irradiation, electrical poling, and mechanical orientation on the morphology of ferroelectric random copolymers of vinylidene fluoride and trifluorethylene {P[VDF/TrFE] (70/30)}. The influences of these different treatments on the molecular orientation distribution of the amorphous and crystalline phases are discussed, as well as their influences on the crystallinity of the material. The elastic stiffness and the related viscosity tensors of P[VDF/TrFE] (70/30), the elastic stiffness modulus of the amorphous matrix, and the hierarchy of stiffness constants of the crystalline state have been determined. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 200-204 
    ISSN: 0044-2313
    Keywords: Alkaline Earth ; Praseodym ; Iron Oxide ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ba6Pr2Fe4O15, Ba5SrPr2Fe4O15 and Ba5CaPr2Fe4O15Ba6Pr2Fe4O15 (I), Ba5SrPr2Fe4O15 (II), and Ba5CaPr2Fe4O15 (III) have been prepared by high temperature CO2-LASER techniques. (I)-(III) crystallize isotypic to the Ba6Ln2Al4O15 type, space group C6v4-P63mc, (I): a = 11.808(2), c = 6.894(5), Z = 2. Typical features of the crystal structure are face shared MO6 octahedra (M = Ba or Ba/Sr, Ba/Ca) and a statistical distribution of Ba and Pr in a ratio of 1 : 2 within double capped trigonal prisms of oxygen. Fe shows tetrahedral as well as octahedral coordination by oxygen. Calculation of coulomb terms of lattice energy indicate the stabilization of Pr3+ beside Fe3+ by the Ba6Ln2Al4O15 type.
    Notes: Ba6Pr2Fe4O15 (I), Ba5SrPr2Fe4O15 (II) und Ba5CaPr2Fe4O15 (III) wurden mit Hochtemperatur-CO2-LASER-Technik dargestellt. (I)-(III) kristallisieren mit hexagonaler Symmetrie, Raumgruppe C6V4-P63mc, (I): a = 11.808(2), c = 7,036(4) Å; (II): a = 11.689(2), c = 6.954(2) Å; (III): a = 11.602(6), c = 6.894(5) Å, Z = 2. Charakteristische Eigenschaften dieser Kristallstruktur sind flächenverknüpfte MO6-Oktaeder (M = Ba oder Ba/Sr, Ba/Ca) und eine statistische Verteilung von Ba und Pr im Verhältnis 1 : 2 in einem zweifach überkappten trigonalen Sauerstoffprisma. Fe zeigt sowohl tetraedrische als auch oktaedrische Sauerstoffkoordination. Berechnungen der Coulomb-Terme zur Gitterenergie deuten an, daß durch den Ba6Ln2A4O15-Typ Pr3+ neben Fe3+ stabilisiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1173-1176 
    ISSN: 0887-6266
    Keywords: poly(ε-caprolactone) films on highly oriented PTFE substrate ; Brillouin spectroscopy of ultraoriented poly(ε-caprolactone) films ; crystallization of ultra-oriented poly(ε-caprolactone) on PTFE sustrate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1693-1698 
    ISSN: 0044-2313
    Keywords: Barium ; Copper ; Vanadyl Phosphate ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cu4O12 Groups Built of Square Planar CuO4 Polygones in the Barium Vanadyl Oxocuprate(II) Phosphate Ba(VO)Cu4(PO4)4Single crystals of Ba(VO)Cu4(PO4)4 have been prepared by solid state reactions just below the melting points of the reaction mixtures of BaP2O6, Cu3(PO4)2, CuO, V2O5 and V2O3 in evacuated closed quartz glas tubes. The compound crystallizes with tetragonal symmetry, Space group D42—P4212, a = 9.560(2), c = 7.160(2) Å, Z = 2. Special and new features of the crystal structure are to each other isolated Cu4O12 and (VO)(PO4)4 groups. The crystal chemistry of the Cu4O12 groups is discussed with respect to other compounds containing out of plane connected square planar MO4 polygones.
    Notes: Einkristalle von Ba(VO)Cu4(PO4)4 wurden mit Festkörperreaktionen dicht unterhalb des Schmelzpunktes des Reaktionsgemenges aus BaP2O6, Cu3(PO4)2, CuO, V2O5 und V2O3 in geschlossenen, evakuierten Quarzglasampullen dargestellt. Diese Verbindung kristallisiert tetragonal, Raumgruppe D42—P4212, mit a = 9,560(2), c = 7,160(2) Å, Z = 2. Besondere und neue Eigenschaften der Kristallstruktur sind zueinander isolierte Cu4O12- und (VO)(PO4)4-Gruppen. Die Kristallchemie der Cu4O12-Baugruppen wird mit Blick auf andere Verbindungen, die nicht in Ebenen verknüpfte MO4-Polygone aufweisen, diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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