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  • 1
    Electronic Resource
    Electronic Resource
    Thermal decomposition of carnallite (KCl · MgCl2 · 6H2O)-comparison of experimental results and phase equilibria (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 2161-2167 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die thermogravimetrische Kurve TG der Zersetzung von Carnallit (KCl · MgCl2 · 6H2O) bei konstantem Wasserdampfdruck (1 bar) wurde basierend auf dem Phasendiagramm (fest-flüssig-Gleichgewichte) und auf Dampfdruckdaten berechnet und mit experimentellen Ergebnissen verglichen.
    Abstract: Резюме На основе фазовой диа граммы (равновесие ти па твердое тело-жидкост ь) и давления паров, была вычислена кривая ТГ разложения карналлита (KСl · MgCl2 · 6Н2О) при постоян ном давлении паров воды (1 б ар) и которая была сопо ставлена с экспериментально н айденной.
    Notes: Abstract The thermogravimetric curve (TG) for the decomposition of carnallite (KCl · MgCl2 · 6H2O) at constant water vapor pressure (1 bar) was calculated from the phase diagram (solid-liquid equilibria) and vapor pressure data, and the calculated and experimental results were compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911881
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  • 2
    Electronic Resource
    Electronic Resource
    Pitzer Parameters for the Pertechnetate Ion in the System Na+/K+/Mg2+/Ca2+/Cl−/SO 2 4 −/TcO − 4 /H2O at 25°C (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 107-120 
    Details
    ISSN: 1572-8927
    Keywords: Sodium pertechnetate ; magnesium pertechnetate ; potassium pertechnetate ; osmotic coefficients ; activity coefficients ; solubility ; seawater system ; Pitzer model ; binary parameters ; mixing parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Isopiestic vapor pressure experiments are performed at 25°C with aqueous Mg(TcO4)2 solutions and with ternary mixtures containing various combinations of NaTcO4, Mg(TcO4)2, NaCl, MgCl2, Na2SO4, and MgSO4. The osmotic coefficients of the binary solutions are used to evaluate the binary Pitzer parameters β(0), β(1), and CΦ for Mg(TcO4)2. We previously reported these parameters for NaTcO4. The binary parameters for KTcO4 and Ca(TcO4)2 are evaluated from solubilities of KTcO4 in KCl and CaCl2 solutions, respectively. The mixing parameters Θ TcO 4 − /Cl −, ΨM/TcO 4 − /Cl −, Θ TcO 4 − /SO 4 2− , ΨM/TcO 4 − /SO 4 2− , and ΨNa + /Mg 2+ /TcO4 2− are calculated from either osmotic coefficients or solubilities in the corresponding ternary mixtures. The evaluated set of Pitzer parameters predicts well the activity coefficients and solubilities of KTcO4 in multicomponent systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022625605743
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  • 3
    Electronic Resource
    Electronic Resource
    The ion product of H2O, dissociation constants of H2CO3 and pitzer parameters in the system Na+/H+/OH−/HCO 3 − /CO 3 2- /ClO 4 − /H2O at 25°C (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 327-343 
    Details
    ISSN: 1572-8927
    Keywords: Ion product of water ; carbonic acid ; dissociation constants ; NaClO4 solution ; iomic strength ; activity coefficients ; Pitzer model ; mixing parameters ; solution thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The ion product of water and the dissociation constants of carbonic acid have been determined in 0.1, 1.0, 3.0, and 5.0M NaClO4 at 25°C. The ion product of water K w ' has been evaluated by emf measurements with a combined glass electrode in NaClO4 solutions containing 0.001–0.1M HCLO4 or NaOH. The product K H ' K l ' K 2 ' of the Henry constant for CO2 and the dissociation constants for H2CO3 have been determined by titration of carbonate solutions equilibrated with pCO2 =10−3.52 atm, and K 2 ' has been evaluated by potentiometric titration and by measuring the H+ concentration at fixed HCO 3 − and CO 3 2- concentrations. The ion interaction (Pitzer) equations are applied to describe the constants K w ' , K 2 ' and K H ' H 1 ' K 2 ' as a function of the NaClO4 concentration. The experimental data are used to evaluate the mixing parametersΘ i/ClO 4 andΨ i/ClO 4 -/Na+ fori = OH -,HCO 3 - andCO 3 2-
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972890
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of Cm(III) in Concentrated Salt Solutions: Carbonate Complexation in NaCl Solution at 25°C (1999)
    Springer
    Journal of solution chemistry 28 (1999), S. 447-462 
    Details
    ISSN: 1572-8927
    Keywords: Trivalent actinides ; curium ; americium ; solution thermodynamics ; carbonate complexation ; ionic strength ; Pitzer model ; concentrated solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The carbonate complexation reactions of Cm(III) were studied by time-resolved laser fluorescence spectroscopy in 0–6 m NaCl at 25°C. The ionic strength dependence of the stepwise formation constants for the carbonato complexes Cm(CO3) n 3−2n with n = 1, 2, 3, and 4 is described by modeling the activity coefficients of the Cm(III) species with Pitzer's ion-interaction approach. Based on the present results and literature data for Cm(III) and Am (III), the mean carbonate complexation constants at I = 0 are calculated to be: log β 101 o =8.1 ±0.3, log β 102 o =13.0 ± 0.6, log β 103 o =15.2 ± 0.4, and log β 104 o =13.0 ± 0.5. Combining these equilibrium constants at infinite dilution and the evaluated set of Pitzer parameters, a model is obtained, that reliably predicts the thermodynamics of bivalent actinide An(III) carbonate complexation in dilute to concentrated NaCl solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022664013648
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  • 5
    Electronic Resource
    Electronic Resource
    Thermoanalytical investigation of sodium acetate trihydrate for application as a latent heat thermal energy storage material (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 685-690 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das thermische Verhalten von Natriumacetat-trihydrat (NaAc · 3H2O) wurde durch DTA, Q-TG und Löslichkeitsmessungen untersucht. Der Keimbildungseffekt von Na4P2O7 · 10H2O gegenüber NaAc · 3H2O ist über längere Zeit nicht stabil. Die Schichtbildung kann zurückgeführt werden auf die Bildung von wasserfreiem NaAc in unterkühlten Schmelzen. Unter statischen Bedingungen der Wärmespeicherung zeigen NaAc·3H2O und Na4P2O7 · 10H2O kein stabiles Verhalten.
    Abstract: Резюме Методами ДТА, Q-ТГ и изме рением растворимост и изучено термическое поведение тригидрата ацетата н атрия. Степень образо вания центров кристаллиза ции в расплавах тригидрата ацетата н атрия по сравнению с т аковой для Na4P2O7 · 10Н2О, была неустойчив ой в течении длительных п ериодов времени. Напл астование может быть отнесено з а счет образования безводного ацетата н атрия в переохлажден ных расплавах. В условиях статического теплового состояния оба соединения не пок азывают стабильного характе ра.
    Notes: Abstract The thermal behaviour of sodium acetate trihydrate (NaAc · 3H2O) was investigated by DTA, Q-TG and measurements of the solubility properties. The nucleation efficiency of Na4P2O7 · 10H2O for the crystallization of NaAc · 3H2O melts is not stable over long periods. Stratification can be ascribed to the formation of anhydrous sodium acetate in the supercooled melts. Under static heat storage conditions, NaAc · 3H2O and Na4P2O7 · 10H2O do not exhibit stable behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138574
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  • 6
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria in the system KCl—MgCl2—H2O at elevated temperatures. III. Isotherms at 160, 170, and 180°CDedicated to Professor Lothar Kolditz on his 60th Birthday (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 576 (1989), S. 99-107 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fest-Flüssig-Phasengleichgewichte des Systems KCl—MgCl2—H2O bei erhöhten Temperaturen. III. Isothermen bei 160, 170 und 180°CExperimentelle Ergebnisse der Fest-Flüssig-Phasengleichgewichte im System KCl—MgCl2—H2O bei 160, 170 und 180°C werden vorgestellt. Neben den bekannten festen Phasen KCl, KCl · MgCl2 · 6 H2O und MgCl2 · 4 H2O wurden zwei weitere Doppelsalze mit der Zusammensetzung 1,5 KCl · MgCl2 · 2 H2O und KCl · MgCl2 · 2 H2O gefunden. Das letztere Doppelsalz und MgCl2 · 2 H2O bilden feste Lösungen. Die neuen Verbindungen wurden mit Hilfe der Röntgenpulverdiffraktometrie charakterisiert.
    Notes: Experimental results are reported for the solid-liquid phase equilibria of the ternary system KCl—MgCl2—H2O at 160, 170, and 180°C. Beyond the known solid phases KCl, KCl · MgCl2 · 6 H2O, and MgCl2 · 4 H2O two further double salts with the composition 1.5 KCl · MgCl2 · 2 H2O and KCl · MgCl2 · 2 H2O have been found. The latter double salt and MgCl2 · 2 H2O form solid solution. The new compounds were characterized by X-ray powder diffractometry.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895760112
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  • 7
    Electronic Resource
    Electronic Resource
    Solid-Liquid-Phase Equilibria in the System KCl—MgCl2—H2O at Elevated Temperatures. I. The Binary System MgCl2—H2O at 130-250°CProfessor Wolfgang Wieker zum 60. Geburtstage am 19. April 1987 gewidmet (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 547 (1987), S. 21-26 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fest-Flüssig-Phasengleichgewichte im System KCl—MgCl2—H2O bei erhöhten Temperaturen. I. Das binäre System MgCl2—H2O bei 130 bis 250°CExperimentelle Ergebnisse zur Bestimmung der Fest-Flüssig-Phasengleichgewichte im System MgCl2—H2O bei Temperaturen von 130 bis 250°C werden vorgestellt.
    Notes: Experimental studies of the solid-liquid-phase equilibria of the system MgCl2—H2O within a temperature range of 130°C to 250°C are presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875470403
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  • 8
    Electronic Resource
    Electronic Resource
    Solid-Liquid phase Equilibria in the System KCl—MgCl2—H2O at elevated temperatures. II. Isotherms at 130, 140, and 150°C (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 165-169 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fest-Flüssig-Phasengleichgewichte des Systems KCl—MgCl2—H 2O bei erhöhten Temperaturen. II. Isothermen bei 130, 140 und 150°CExperimentelle Ergebnisse der Fest-Flüssig-Phasengleichgewichte im System KCl—MgCl2—H2O bei 130, 140 und 150°C werden vorgestellt. Eine bereits beschriebene „analytische“ Methode wurde angewendet.
    Notes: Experimental results are reported for the solid-liquid phase equilibria of the ternary system KCl—MgCl2—H2O at 130, 140, and 150°C. An “analytic” method, described previously, was used.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885620121
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