Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Electronic Resource  (12)
  • 1990-1994  (11)
  • 1980-1984  (1)
Source
Material
  • Electronic Resource  (12)
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Structure of copper(II) hydroxide, Cu(OH)2 (1990)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 2279-2284 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270190006230
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The twin structure of La2Ti2O7: X-ray and transmission electron microscopy studies (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 235-244 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876819200987X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Activated state in the lepidocrocite structure during thermal treatment (1990)
    Springer
    Naturwissenschaften 77 (1990), S. 177-179 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131161
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Bernalite : a new ferric hydroxide with perovskite structure (1992)
    Springer
    Naturwissenschaften 79 (1992), S. 509-511 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01135768
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Comparative thermochemical studies of carbonaceous Chondrites (1992)
    Springer
    Naturwissenschaften 79 (1992), S. 172-175 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134435
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Thermal reduction and reoxidation of spinel-type Cu1−xZnxAl2O4 (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 611-618 
    Details
    ISSN: 1572-8943
    Keywords: spinel-type Cu1−xZnxAl2O4 ; thermal reduction ; thermal reoxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für verschiedene Cu:Zn-Verhältnisse wurde die thermochemische Reaktivität des quartären Metalloxides Cu1−xZnxAl2O4 vom Spinelltyp untersucht. In Sauerstoff oder in inerten Gasen wird keine nennenswerte Reduktion beobachtet. In molekularem Wasserstoff keine bei relativ hohen Temperaturen eine selektive Metallreduktion von Cu beobachtet werden. Das feste Reaktionsprodukt besteht aus gesintertem, schwach dispersem metallischem Kupfer auf einem Zn-Al-O-Metalloxidträgermaterial: ein potentieller Katalysator für die Methanolsynthese. Wegen der gemessenen hohen Reduktionstemperaturen, die zur Sinterung des Kupfers führen, kann die Aktivität dieses Systemes nicht allzu hoch sein.
    Notes: Abstract The thermochemical reactivity of the spinel-type quaternary metal oxide Cu1−xZnxAl2O4 has been investigated for different Cu:Zn ratios. In oxygen or inert gas atmospheres no considerable reduction is observed. In molecular hydrogen metal selective reduction of the Cu is found at relatively high temperature. The solid reduction product is made up of sintered, poorly dispersed metallic copper on a Zn-Al-O metal oxide support, a potential catalyst for the methanol synthesis. Owing to the measured high reduction temperature leading to the mentioned sintering of the metallic copper, the activity of this system cannot be high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979388
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Experimental approach to the determination of mechanism and kinetics of heterogeneous solid state reactionsA S →B S +C G (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 1013-1016 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Strukturelle und morphologische Untersuchungen der Zersetzung von Ni(SCN)2(C5H5N)4-Einkristallen zu polykristallinem Ni(SCN)2(C5H5N)2 haben gezeigt, da\ diese Festkörperreaktion nach einem “Kugelkontraktions-Reaktionsmechanismus” verlÄuft. Unter Berücksichtigung der bei quantitativen thermoanalytischen Messungen möglicherweise auftretenden Artetakte wurde ein Weg zur Bestimmung der spezifischen und reproduzierbaren kinetischen Parameter für den geschwindigkeitsbestimmenden Schritt aufgezeigt.
    Abstract: РЕжУМЕ стРУктУРНыЕ И МОРФОл ОгИЧЕскИЕ ИсслЕДОВА НИь тВЕРДОтЕльНОгО пРОц ЕссА РАжлОжЕНИь МОНОкРИстАллОВ кОМп лЕксА Ni(SCN)2(C5H5N)4 ДО МИкРОкРИстАллИЧЕск ОгО Ni(SCN)2(C5H5N)2 ОБНАРУжИлИ “МЕх АНИжМ РЕАкцИИ тИпА сжИМАЕМОИ сФЕРы”. пЕР ЕсМАтРИВАь жАНОВО ФАкты, ОтМЕЧЕН НыЕ НА ОсНОВЕ кОлИЧЕс тВЕННых тЕРМОАНАлИтИЧЕскИх ИжМЕРЕНИИ, ОпИсАН пУть ОпРЕДЕлЕ НИь спЕцИФИЧЕскИх И ВОспРОИжВОДИМых кИН ЕтИЧЕскИх пАРАМЕтРО В Дль стАДИИ, ОпРЕДЕльУ ЩЕИ скОРОсть РЕАкцИИ.
    Notes: Abstract Structural and morphological investigations of the solid state decomposition process of Ni(SCN)2(C5H5N)4 single crystals to microcrystalline Ni(SCN)2(C5H5N)2 reveal a ‘contracting sphere reaction mechanism’. Reconsidering possible artefacts registered by quantitative thermoanalytical measurements a pathway for the determination of specific and reproducible kinetic parameters for the rate-limiting step is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02188853
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Thermochemical reactivity of superconducting mixed copper oxides (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 1989-1996 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die Bedeutung thermoanalytischer Methoden für die Untersuchung supraleitender Kupfermischoxide beschrieben. In Abhängigkeit verschiedener Gasatmosphären wird die thermochemische Reaktivität von keramischen Supraleitern charakterisiert, die sowohl die Strukturen von YBa2Cu3O7−x, von K2NiF4 oder auch von Verbundstrukturgerüsten annehmen. Die Ergebnisse zeigen eindeutig, daß in Abhängigkeit von der umgebenden Gasatmosphäre die meisten von ihnen eine bemerkenswerte Reaktivität aufweisen. Weiterhin scheint der Sauerstoffanteil von äußerster Wichtigkeit für die supraleitenden Eigenschaften zu sein. Der Stabilitätsbereich von supraleitenden Phasen mit einem gegebenen Sauerstoffanteil ist hingegen oft sehr schmal. Eine thermoanalytische Überwachung von Redoxprozessen und die Erstellung von Phasendiagrammen ist somit unentbehrlich.
    Notes: Abstract The importance of thermoanalytical methods for the investigation of superconducting mixed copper oxides is discussed. The thermochemical reactivity of ceramic superconductors adopting the structures of YBa2Cu3O7−x, of K2NiF4 as well as of the composite structural frameworks is characterized in dependence of various gas atmospheres. The results give evidence, that depending on the ambient gas atmosphere most of these phases turn out to be remarkably reactive. Moreover, the oxygen stoichiometry proves to be of paramount importance for the superconducting properties. In turn, the range of stability of a superconducting phase with a given oxygen stoichiometry is often very narrow. Therefore, the thermoanalytical monitoring of redox processes and the determination of phase diagrams are indispensable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Electric and magnetic properties of the first layered conducting titanium and niobium oxides (1991)
    Springer
    The European physical journal 84 (1991), S. 369-374 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Three-dimensional titanium and niobium oxides are superconducting at temperatures considerably lower than layered copper oxides. Therefore it seems worthwhile to study layered titanium and niobium oxides. Layered conducting phases, however, were not known until recently, when the study of the LaTiOx system led to the first layered conducting titanium oxides. Single crystals of isostructural niobium oxides, CaNbOx, SrNbOx and Sr0.9La0.1NbO3.4, were prepared with the floating zone melting technique. In common with LaTiOx they have the following properties. For x≅3.4, its layered perovskite-related structure of a known type is derived from the layered highest-T c (〉1600 K) ferroelectrics LaTiO3.5, CaNbO3.5 and SrNbO3.5. In the range 3.42 〈x〈3.50 well ordered intergrowth takes place between the ferroelectricx=3.5 structure and thex=3.4 structure. This intergrowth was found to be representative of the bulk and the stacking sequence is dependent onx. Forx〈3.5, magnetic and resistivity measurements were performed between room temperature and 4.2 K. The temperature dependence of the magnetic susceptibility along the layers displays a minimum. Semiconducting behavior was found along and perpendicular to the layers. At low temperatures the resistivity exhibits thermally activated behavior with unexpectedly small activation energies in the meV range. This might indicate that a further lowering of the average titanium and niobium valencies could lead to metallic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314010
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Phase diagram of LaTiO x : from 2D layered ferroelectric insulator to 3D weak ferromagnetic semiconductor (1991)
    Springer
    The European physical journal 82 (1991), S. 211-216 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract LaTiO x compounds are structurally related to perovskites and there are two known phases. The first,x=3.50, is a 2D layered-type ferroelectric. The second,x=3.00, is a weak ferromagnet with a 3D orthorhombic distorted perovskite structure. 20 samples with varying oxygen stoichiometry between these end members were prepared by floating zone melting, and then characterized by means of X-ray powder diffraction, electron microscopy, thermogravimetric analysis, resistivity and magnetic measurement. A phase diagram is established which displays the following physical and structural properties. A structural phase boundary atx=3.20 separates a new series of 2D layered structures from the 3D orthorhombic one. The former series represents the first conducting titanium oxides with a 2D layered structure to be reported. Atx=3.10 a phase boundary exists between a metallic and a weak ferromagnetic state where the magnetic transition temperatureT c can be sensitively tuned by the oxygen stoichiometryx. Samples withT c between 100 K and 130 K exhibit a metal-semiconductor transition whereas samples with higherT c , up to 149 K, are semiconductors between room temperature and 4.2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01324328
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...