Skip to main content
Log in

A critical assessment of the standard molar gibbs free energy of formation of NiWO4

Bulletin of Materials Science Aims and scope Submit manuscript

Abstract

Three independent studies have been reported on the free energy of formation of NiWO4. Results of these measurements are analyzed by the “third-law” method, using thermal functions for NiWO4 derived from both low and high temperature heat capacity measurements. Values for the standard molar enthalpy of formation of NiWO4 at 298·15 K obtained from “third-law” analysis are compared with direct calorimetric determinations. Only one set of free energy measurements is found to be compatible with calorimetric enthalpies of formation. The selected value for Δf H 0m (NiWO4, cr, 298·15 K) is the average of the three calorimetric measurements, using both high temperature solution and combustion techniques, and the compatible free energy determination. A new set of evaluated data for NiWO4 is presented.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Abbreviations

C 0p,m :

Standard molar heat capacity

T :

Thermodynamic temperature in kelvin

Δf G 0m :

Standard molar Gibbs free energy of formation from elements

Δi G 0m :

Standard molar Gibbs free energy change for reaction i

Δf H 0m :

Standard molar enthalpy of formation from elements

cr:

crystal

GEF:

Gibbs energy function

References

  • Amosse J and Mathieu J C 1974C. R. Acad. Sci. Paris C279 871

    Google Scholar 

  • Aune R E, Sridhar S and Du Sichen 1994J. Chem. Thermodynamics 26 493

    Article  CAS  Google Scholar 

  • Charette G G and Flengas S N 1968J. Electrochem. Soc. 115 796

    Article  CAS  Google Scholar 

  • Jacob K T 1977J. Mater. Sci. 12 1647

    Article  CAS  Google Scholar 

  • Jacob K T and Srikanth S 1988J. Mater. Res. 3 687

    Article  CAS  Google Scholar 

  • Knacke O, Kubaschewski O and Hesselmann K 1991Thermochemical properties of inorganic substances, (Berlin Heidelberg: Springer-Verlag)

    Google Scholar 

  • Kvernes I and Kofstad P 1973Scand. J. Metall. 2 291

    CAS  Google Scholar 

  • Landee C P and Westrum E F Jr 1976J. Chem. Thermodynamics 8 471

    Article  CAS  Google Scholar 

  • Mah A D and Pankratz L B 1976Contributions to the data on theoretical metallurgy, Bulletin 668, U.S. Department of the Interior, Bureau of Mines, Washington D.C.

    Google Scholar 

  • Navrotsky A and Kleppa O 1969J. Inorg. Chem. 8 756

    Article  CAS  Google Scholar 

  • Pankratz L B 1982Thermodynamic properties of elements and oxides, Bulletin 672, U.S. Department of Interior, Bureau of Mines, Washington D.C.

    Google Scholar 

  • Porshina Z V and Rezukhina T N 1960Russ. J. Inorg. Chem. 5 488

    Google Scholar 

  • Rezukhina T N and Zharkova L A 1958Zhur. Fiz. Khim. 32 2233

    Google Scholar 

  • Rezukhina T N and Kashina T A 1974Russ. J. Phys. Chem. 48 1702

    Google Scholar 

  • Rizzo F E, Bidwell L R and Frank D F 1969Trans. Metall. Soc. AIME 239 1901

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Raj, P.M. A critical assessment of the standard molar gibbs free energy of formation of NiWO4 . Bull. Mater. Sci. 18, 623–630 (1995). https://doi.org/10.1007/BF02744848

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02744848

Keywords

Navigation