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  • 1
    Electronic Resource
    Electronic Resource
    Phasenumwandlungen und thermische Ausdehnung von Sr3TeO6, Ba3TeO6 und einigen ihrer Mischkristalle (1984)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 17 (1984), S. 456-458 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Sr3TeO6, tetragonal, and Ba3TeO6, orthorhombic, which have cryolite-related structures, form tetragonal and cubic solid solutions. The tetragonal phases show highly anisotropic thermal expansion, which precedes phase transitions to cubic modifications between 370 and 670 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889884011924
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Decomposition Kinetics of Some Metal Complexes of N,N-diethyl-n '-benzoylthiourea (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 955-965 
    Details
    ISSN: 1572-8943
    Keywords: kinetics ; metal complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thermogravimetry (TG) and differential thermal analysis (DTA) were performed on the complexes with general formula (M(DEBT)n (where M =Fe, Co, Ni, Cu or Ru; n =2, or 3 and DEBT=N,N-diethyl-N'-benzoylthiourea). Derivative thermogravimetric (DTG) curves were also recorded in order to obtain decomposition data on the complexes. The complexes of Fe(III), Co(II), Ni(II), Cu(II) and Ru(III) displayed two- or three-stage decomposition patterns when heated in a dynamic nitrogen atmosphere. Mass loss considerations relating to the decomposition stages indicated the conversion of the complexes to the sulfides or to the corresponding metal alone (Cu, Ru, NiS, CoS or FeS). Mathematical analysis of the TG and DTG data showed that the order of reaction varied between 0.395 and 0.973. Kinetic parameters such as the decomposition energy, the entropy of activation and the pre-exponential factor are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010171230450
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal behaviour of some metal complexes of N,N-diethyl-N′-benzoyl thiourea (1997)
    Springer
    Journal of thermal analysis and calorimetry 48 (1997), S. 1423-1429 
    Details
    ISSN: 1572-8943
    Keywords: complexes ; N,N-diethyl-N′-benzoylthiourea ; thermal behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal behaviour of the complexes of N,N-diethyl-N′-benzoylthiourea (DEBT) with Ni(II), Cu(II), Pt(II), Pd(II) and Ru(III) was studied using differential thermal analysis (DTA) and thermogravimetry (TG). These complexes undergo only a pyrolytic decomposition process. A gas chromatography-mass spectrometry combined system was used for the verification of the first decomposition product and X-ray diffraction method for the characterization of the final products of pyrolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983453
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Bestimmung der Lanthanoiden durch Röntgenfluorescenzanalyse (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 318 (1984), S. 604-607 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Bestimmung aller Lanthanoiden (außer Pm) nebeneinander mit Sr als innerem Standard wurde eine RFA-Dünnschichtmethode entwickelt, bei der die Proben aus Lösungen auf Filterpapier hergestellt werden. Für geeignete L-Strahlungen sind die Eichkurven bis zu gesättigten Lösungen linear. Matrixeffekte werden eliminiert, Reflexüberlagerungen lassen sich wirksam korrigieren. Die statistischen Nachweisgrenzen betragen zwischen 0,2 und 0,6 μg/cm2, d. h. bezogen auf die Lösung zwischen 20 und 60 ppm.
    Notes: Summary A thin-layer method of X-ray fluorescence analysis has been developed for determining the lanthanoides (except Pm) in the presence of each other with Sr as internal standard. Samples are prepared from solutions on filter paper. With suitable L-radiations, linear calibration curves are obtained up to saturated solutions. Matrix effects are eliminated, reflection overlap is corrected efficiently. Statistical detection limits are between 0.2 and 0.6 μg/cm2, i.e. between 20 and 60 ppm in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00529120
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    Paper (German National Licenses)
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