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  • electrolytes  (2)
  • entropies  (2)
  • thermodynamics  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The thermodynamics of aqueous borate solutions. II. Mixtures of boric acid with calcium or magnesium borate and chloride (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 435-446 
    Details
    ISSN: 1572-8927
    Keywords: Borates ; thermodynamics ; electrolytes ; Harned cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Potentials for the cell without liquid juction $$H_2 ,Pt|B(OH)_3 (m_1 ),NaB(OH)_4 (m_2 ),MCl_2 (m_3 )|AgCl,Ag$$ with M=Ca2+ or Mg2+ are reported over a range of ionic strength at 5, 15, 25, 35, 45, and 55°C. Parameters of Pitzer's ion interaction treatment are determined for Ca(B(OH)4)2 and Mg(B(OH)4)2 by fitting to the cell results. Apparent association of alkaline earth borates to form the monovalent species CaB(OH) 4 + and MgB(OH) 4 + makes it necessary to use the extended β(2) form of the ion interaction treatment to represent the potentials reported here. Trace activity coefficients of calcium and magnesium borates are tabulated at various temperatures and ionic strengths. The association constants for ion pair formation implied by the values of β(2) for these salts are compared with ion pair formation constants available in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647311
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The thermodynamics of aqueous borate solutions I. Mixtures of boric acid with sodium or potassium borate and chloride (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 791-803 
    Details
    ISSN: 1572-8927
    Keywords: Borates ; aqueous ; thermodynamics ; electrolytes ; Harned cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Potentials for the cell without liquid junction $$H_2 ,Pt\backslash B(OH)_3 (m_1 ), MB(OH)_4 (m_2 ), MCl(m_3 )\backslash AgClAg$$ where M is sodium or potassium are reported over a range of ionic strength to I=3 mol-kg−1 at 5 to 55°C. Total boron concentration in the solutions was restricted to low levels to minimize formation of polynuclear boron species. Cell potentials are treated with the Pitzer ion interaction treatment for mixed electrolytes, with linear ionic strength dependence assumed for the activity coefficient of undissociated boric acid. Trace activity coefficients of sodium and potassium borates in chloride media are calculated at various temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650749
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Advantages to Conversion of Lattice Heat Capacity to Cv in the Resolution of Excess Properties The Ln2S3's as an example (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 1055-1062 
    Details
    ISSN: 1572-8943
    Keywords: Cp ; Cv ; entropies ; Ln2S3 ; phonon dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper represents a fitting (modeling) of the temperature dependence of the Komada-Westrum characteristic temperature for those γ-, δ- and ε-phase lanthanide sesquisulfides for which the total heat capacities, including internal degrees of freedom (e.g., Schottky and magnetic contributions), were connected to the residue of only lattice vibrations yielding lattice heat-capacity contributions. These characteristic temperatures (θKW) at 298.15 K are seen to behave smoothly (nearly linearly) as a function of (cationic) atomic number within the region of stability of each phase as does the density. The trends between the phases also show some consistency but not predictability of one from the other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010153110658
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Modeling Sub- and Super-ambient Heat Capacities of the Group Iva Compounds Despite the Lanthanide Contraction (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 659-667 
    Details
    ISSN: 1572-8943
    Keywords: Cp ; Cv ; entropies ; group IVA element compounds ; Hf ; Zr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper is concerned with the estimation of heat capacities in the IVA 3d-transition element compounds using especially Zr and Hf compounds as examples. Most prediction schemes routinely tacitly assume that volumes and masses trend ‘in parallel’. However, the lanthanide contraction here ensures for ZrX/HfX systems — and generally elsewhere — that this is not so in this portion of the periodic table. Available methods such as Latimer's, Volumetric Priority, Komada-Westrum, Grimvall's, and Sommers' are compared on IVA elements and compounds. Only the Sommers approach has volumetric input. It provides the best prediction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010111908035
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    Paper (German National Licenses)
    Fulltext
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