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  • 1
    Electronic Resource
    Electronic Resource
    Unterschiedliche ferroelektrische Eigenschaften in verschiedenen Gebieten von Seignettekristallen (1961)
    Springer
    The European physical journal 162 (1961), S. 313-328 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung In Seignettesalz-Einkristallen gibt es verschiedene Gebiete, die sich durch ihre dielektrischen Eigenschaften (Curie-Temperatur, maximale Dielektrizitätskonstante, Form der Hystereseschleife) unterscheiden. Je ein Gebiet besteht aus den Kristallteilen, in denen während des Wachstums das Material au die gleiche Kristallfläche angelagert wurde (Wachstumsgebiet). Als Ursache für die unterschiedlichen Eigenschaften werden chemische und strukturelle Fehlordnungen angenommen. Der Einfluß eines geringen Zusatzes von Ammonium-Natrium-Tartrat wird näher untersucht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01341978
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of a new ferroelectric crystal family: MCd(NO2)3 [M=NH4, K, Rb, Cs, Tl] (1993)
    Springer
    The European physical journal 92 (1993), S. 457-460 
    Details
    ISSN: 1434-6036
    Keywords: 77 ; 80 ; B
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single crystals of MCd(NO2)3, with M=NH4, K, Rb, Cs, and Tl, respectively, were grown and investigated by means of optical and dielectric methods. The crystals show rhombohedral symmetry (possible space group R 3) and multi-domain patterns at ambient temperature. The compounds exhibit phase transitions above room-temperature of first (M=K) and second order (M=Rb, Cs, Tl), respectively, into cubic high-temperature phases. Observed dielectric anomalies and hysteresis loops point to ferroelectric properties and suggest a relaxational order-disorder mechanism of the nitrite ions to be responsible for the transitions. The MCd-(NO2)3-compounds are seen to represent a new family of ferroelectrics with a cubic prototypic phase closely related to the structural type of the perovskites. The transions are classified by symmetry considerations, and a possible structure of the cubic high-temperature phase with space group Pm3 is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320508
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Segmented block copolymer models of uniform chain length and defined structure, 1. Synthesis and characterizationDedicated to Prof. H. J. Cantow on his 60th birthday (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1335-1360 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Segmented block copolymer models of defined structure with molecular weights up to ca. 4000 were synthesized by specific condensation of monofunctional derivatives of oligo condensation products of 4,4′-isopropylidenediphenol (Bisphenol A) with terephthalic acid and oligomethylenes of uniform chain length. The oligo(arylester) blocks were prepared by stepwise addition of oxyterephthaloyloxy-1,4-phenyleneisopropylidene-1,4-phenylene units using a suitable protection and activation scheme. Similarly, oligo(arylester)s containing isophthaloyl and phthaloyl units were obtained. Telechelic oligomethylene segments were prepared analogously by combining functional derivatives of decane. All compounds were characterized by chemical, spectroscopic, and chromatographic methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850707
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    Paper (German National Licenses)
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