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
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic study of the solid-liquid equilibria in the MPO"3-LaP"3O"9 systems (M = Li, Na, K, Rb, Cs, Ag, Tl)
    Amsterdam : Elsevier
    Thermochimica Acta 116 (1987), S. 85-100 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(87)88168-6
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Analyse conductimetrique automatisee des equilibres solide-liquide
    Amsterdam : Elsevier
    Thermochimica Acta 194 (1992), S. 137-147 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(92)80012-L
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Construction d'un enthalpimetre adapte a l'etude des equilibres solide-liquide multiconstitues (1991)
    Springer
    Journal of thermal analysis and calorimetry 37 (1991), S. 861-874 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für die Untersuchung von fest-flüssig-Gleichgewichten in Multikom-ponentensystemen wurde ein Enthalpiemeter gebaut und verbessert. Darin können Messungen zwischen −100 und + 150°C durchgeführt werden. Während der Thermoanalyse werden die Proben bei konstanter Duchsatzgeschwindigkeit ständig gerührt und erhitzt oder gekühlt. Unter diesen Bedingungen werden reproduzierbare und sehr genaue Ergebnisse erzielt und sehr eng beieinanderliegende Temperatur-phänomene können getrennt werden. Als Beispiel wurde das ternäre System Wasser-Strontiumchlorid-Bariumchlorid bei niederen Temperaturen untersucht und ein polythermisches Diagramm bis 100°C erstellt.
    Notes: Abstract In order to study solid-liquid equilibria in multicomponent systems, an enthalpimeter has been built and perfected. Measurements can be carried out between —100 and +150°. During the thermal analysis, samples are continually stirred and heated, or cooled, at constant flow rate. In these conditions, reproducible and accurate results are obtained and very closed temperature phenomena may be separated. As an illustration, the ternary system waterstrontium choride-barium chloride has been studied at low temperature and the polythermic diagram is described up to 100°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913167
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Tude par ACD du domaine hors d'equilibre du systemexLiCl-(1−x)H2O (0〈x〈0.18) (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 423-431 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Nicht-Gleichgewichtsgebiet des PhasendiagrammsxLiCl-(1−x)H2O (0⩽x⩽ 0.18) wurde mittels DSC unter Verwendung des Scanningkalorimeters Mettler TA 2000 B untersucht. Die metastabilen Zweige des Diagramms wurden ermittelt und die erhaltenen verschiedenen metastabilen Phasen erklärt. Es wurde ein Bereich festgestellt, in dem das gebildete Glas nicht rekristallisieren kann, da das Eutektikum unterhalb der Temperatur der Glasbildung liegt.
    Abstract: Резюме С помощью дифференци ального сканирующег о калориметра теплево го потока Меттлер ТА 2000 Б проведе но исследование нера вновесной области фазовой диаг раммы системыxLiCl-(1−х)Н2О, где 0 ⩽х ⩽ 0.18. Установлены метастабильные лини и диаграммы и объяснено образова ние различных фаз. Най дена область, где образующ ееся стекло не может рекристалли зоваться, поскольку л иния эвтектики лежит ниже температуры расстекловывания.
    Notes: Abstract The non-equilibrium region of the phase diagramxLiCl-(1−x)H2O (0〈x〈 0.18) has been studied by means of a Mettler TA 2000 B heat flow differential scanning calorimeter. The metastable lines of the diagram have been established and the different phases obtained explained. A region has been found where the glass formed cannot recrystallize, the eutectic line being below the temperature of the transition glass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913452
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Reactions Invariantes Induisant La Densification Des Varistances ZnO (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 927-934 
    Details
    ISSN: 1572-8943
    Keywords: binary and ternary oxides ; DOPA ; sintering reaction ; ZnO varistors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrical properties of ZnO varistors are induced by a sintering step. The phenomena occurring during this thermal treatment have been studied through model systems whose nature and composition are well defined. The pure BiSbO4 and Bi3 Zn2 Sb3 O14 phases have been synthetised by Direct Oxidation of a Precursory Alloy (DOPA) and characterized using XRD method. Each one of these phases can react with zinc monoxide through an invariant isobaric reaction in the ZnO–Bi2 O3 –Sb2 O3 system: – at 998°C 17/3〈ZnO〉+2/3〈Bi3 Zn2 Sb3 O14 〉 arrow 〈Zn7 Sb2 O12 〉 + ((Bi2 O3 )) – at 1058°C 7〈ZnO〉+2〈BiSbO4 〉 arrow 〈Zn7 Sb2 O12 〉+((Bi2 O3 )) These thermodynamic considerations can explain the thermal domain of the sintering reaction described in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010134611216
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Etude Experimentale et Modelisation des Equilibres Solide—Liquide du Systeme Binaire H2O—UO2(NO3)2 (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 89-101 
    Details
    ISSN: 1572-8943
    Keywords: liquidus curve modelling ; phasediagram ; quasi ideal model ; uranyl nitrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The binary system H2O—UO2(NO3)2 was studied by solubility measurements and constant heat flow thermal analysis. Temperature and composition of the eutectic transformation between ice and uranyl nitrate hexahydrate were accurately defined. A new hydrate with 24 molecules of water decomposes at −21°C according to the peritectoid reaction 〈UO2(NO3)2·24H2O〉 ⇄ 〈UO2(NO3)2·6H2O〉 + 18〈H2O〉 The quasi-ideal model was applied to the solid—liquid equilibria, using the following reaction hypothesis: ((UO 2 2+ )) + 2((NO 3 − ))+ h((H2O)) ⇄ ((UO2OH+aq)) + ((H3O+aq + 2((NO 3 − aq)) A complete calculation of the binary system was carried out with a global ionic hydration number h equal to 9 in the aqueous solutions. It allowed to the melting enthalpies of uranyl nitrate hydrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010199800650
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Kinetics of the autocatalytic oxidation of N-amino-3-azabicyclo[3,3,0]octane by chloramine in aqueous medium (1995)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 27 (1995), S. 757-768 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the degradation of N-amino-3-azabicyclo[3,3,0]octane by chloramine has been studied by GC and HPLC in stoichiometric conditions in a solution buffered with NaOH/KH2PO4 and Na2B4O7.10 H2O between pH = 10.5 and 13.5. The second-order reaction exhibits specific acid catalysis which indicates competitive oxidation between the haloamine and the neutral and ionic forms of the bicyclic hydrazine. The enthalpy and entropy of activation were determined at pH = 12.89.In a nonbuffered solution, the interaction is autocatalyzed due to acidification of the mixture by the ammonium ions. In basic medium, the reaction forms an endocyclic hydrazone. A mathematical treatment based on an implicit equation allows a quantitative interpretation of all the phenomena observed over the above pH interval. This takes both the acid/base dissociation equilibria and the alkaline hydrolysis of the chloro-derivative into account. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550270803
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Halogenation and amination dual properties of haloamines in Raschig environment: A chlorine transfer reaction between chloramine and 3-azabicyclo[3,3,0]octane (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 29 (1997), S. 89-98 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chlorine transfer reaction between 3-azabicyclo[3,3,0]octane “AZA” and chloramine was studied over pH 8-13 in order to follow both the amination and halogenation properties of NH2Cl. The results show the existence of two competitive reactions which lead to the simultaneous formation of N-amino- and N-chloro- 3-azabicyclo[3,3,0]octane by bimolecular kinetics. The halogenation reaction is reversible and the chlorine derivative obtained, which is thermolabile and unstable in the pure state, was identified by electrospray mass spectrometry. These phenomena were quantified by a reaction between neutral species according to an apparent SN2-type mechanism for the amination process and a ionic mechanism involving a reaction between chloramine and protonated amine for the halogenation process. Amination occurs only in strongly basic solutions (pH ≥ 13) while chlorination occurs at lower pH's (pH ≤ 8). At intermediate pH's, a mixture of these two compounds is obtained. The relative proportions of the products are a function of intrinsic rate constants, pH and pKa of the reactants. The rate constants and thermodynamic activation parameters are the following: k1 = 45.5 × 10-3 M-1 s-1; ΔH10# = 59.8 kJ mol-1; ΔS10# = - 86.5 J mol-1 K-1 for amination; k2 = 114 × 10-3 M-1 s-1; ΔH20# = 63.9 kJ mol-1; and ΔS20# = - 48.3 J mol-1 K-1 for chlorination. The ability of an interaction corresponding to a specific(NH3Cl+/RR′NH) or general (NH2Cl/RR′NH) acid catalysis has been also discussed. © 1997 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...