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Y. Sarıkaya Department of Chemistry, Faculty of Science, Ankara University, Tandoğan 06100, Ankara, Turkey

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M. Önal Department of Chemistry, Faculty of Science, Ankara University, Tandoğan 06100, Ankara, Turkey

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K. Ada Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Kırıkkale, Turkey

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Abstract

The specific micro- and mesopore volumes (V) of alumina compacts fired between 900 and 1250 °C for 2 h were determined from nitrogen adsorption/desorption data. The V value was taken as a sintering equilibrium parameter. An arbitrary sintering equilibrium constant (Ka) was estimated for each firing temperature by assuming Ka = (ViV)/V, where Vi is the largest value at 900 °C before sintering. Also, an arbitrary Gibbs energy (ΔGa°) of sintering was calculated for each temperature using the Ka value. The graph of ln Ka versus 1/T and ΔGa° versus T were plotted, and the real enthalpy (Δ) and the real entropy (Δ) of sintering were calculated from the slopes of the obtained straight lines, respectively. On the contrary, real Δ and K values were calculated using the real Δ and Δ values in the Δ = −RT lnK = 165814 − 124.7T relation in SI units.

  • 1. Kang, SJL. Sintering: densification, grain growth and microstructure. Amsterdam: Elsevier; 2005.

  • 2. Rice, RW. Porosity of ceramics. New York: Marcel Dekker; 1998.

  • 3. Rahman, MN. Ceramic processing and sintering. 2 Boco Raton: CRC Taylor and Francis; 2003.

  • 4. Richerson, DW. Modern ceramic engineering: properties, processing, and use in design. 3 Boca Raton: CRC Taylor and Francis; 2006.

  • 5. Perez-Maqueda, LA, Criado, JM, Real, C. Kinetics of the initial stage of sintering from shrinkage data: simultaneous determination of activation energy and kinetic model from a single nonisothermal experiment. J Am Ceram Soc. 2002;85:763768. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 6. Burnham, AK. An nth-order Gaussian energy distribution model for sintering. Chem Eng J. 2005;108:4750. .

  • 7. Ada, K, Önal, M, Sarıkaya, Y. Investigation of the intra-particle sintering kinetics of a mainly agglomerated alumina powder by using surface area reduction. Powder Technol. 2006;168:3741. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 8. Kingery, WD, Wygant, JF. Application of thermodynamics in ceramics: V. Semiempirical calculations. Am Ceram Soc Bull. 1952;31:344347.

    • Search Google Scholar
    • Export Citation
  • 9. Yokokawa, H, Kawada, T, Dokiya, M. Thermodynamic regularities in perovskite and K2NiF4 compounds. J Am Ceram Soc. 1989;72:152153. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 10. Petric, N, Martinac, V, Tkalčec, E, Ivankovič, H, Petric, B. Thermodynamic analysis of results obtained by examination of the forsterite and spinel formation reactions in the process of magnesium oxide sintering. Ind Eng Chem Res. 1989;28:298302. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 11. Yokokawa, H, Sakai, N, Kawada, T, Dokiya, M. Chemical thermodynamic considerations in sintering of LaCrO3-based perovskites. J Electrochem Soc. 1991;138:10181027. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 12. Gross, GM, Seifert, HJ, Aldinger, F. Thermodynamic assessment and experimental check of fluoride sintering aids for AlN. J Eur Ceram Soc. 1998;18:871877. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 13. Subasri, R, Mallika, C, Mathews, T, Sastry, VS, Sreedharan, OM. Solubility studies, thermodynamics and electrical conductivity in the Th1–xSr–O2 system. J Nucl Mater. 2003;312:249252. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 14. Sarıkaya, Y, Ada, K, Alemdaroğlu, T, Bozdoğan, İ. The effect of Al3+ concentration on the properties of alumina powders obtained by reaction between aluminium sulphate and urea in boiling aqueous solution. J Eur Ceram Soc. 2002;22:19051910. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 15. Ada, K, Sarıkaya, Y, Alemdaroğlu, T, Önal, M. Thermal behavior of alumina precursor obtained by the aluminium sulphate-urea reaction in boiling aqueous solution. Ceram Int. 2003;29:513518. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 16. Sarıkaya, Y, Ada, K, Önal, M. Applications of the zero-order reaction rate model and transition state theory on the intra-particle sintering of an alumina powder by using surface area measurements. J Alloy Compd. 2007;432:194199. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 17. Noyan, H, Önal, M, Sarıkaya, Y. The effect of heating on surface area, porosity and surface acidity of a bentonite. Clays Clay Miner. 2006;54:375381. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 18. Sarıkaya, Y, Aybar, S. The adsorption of NH3, N2O and CO2 gases on the 5A molecular sieve. Commun Fac Sci Univ Ank. 1978;24B:3339.

    • Search Google Scholar
    • Export Citation
  • 19. Sarıkaya, Y, Ada, K, Önal, M. A model for initial-stage sintering thermodynamics of an alumina powder. Powder Technol. 2008;188:912. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 20. Noyan, H, Önal, M, Sarıkaya, Y. Thermal deformation thermodynamics of a smectite mineral. J Therm Anal Calorim. 2008;91:299303. .

  • 21. Bayram, H, Önal, M, Yılmaz, H, Sarıkaya, Y. Thermal analysis of a white calcium bentonite. J Therm Anal Calorim. 2010;101:873879. .

  • 22. Noyan, H, Önal, M, Sarıkaya, Y. A model developed for acid dissolution thermodynamics of a Turkish bentonite. J Therm Anal Calorim. 2008;94:591596. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 23. Brunauer, S, Deming, LS, Deming, DM, Teller, E. On a theory of the van der Waals adsorption of gases. J Am Chem Soc. 1940;62:17231732. .

  • 24. Rouquerol, F, Rouquerol, J, Sing, K. Adsorption by powder and porous solids. London: Academic Press; 1999.

  • 25. Lu, GQ, Zhao, XS. Nanoporous materials. London: Imperial College Press; 2006.

  • 26. Linsen, BG. Physical and chemical aspects of adsorbents and catalysts. London: Academic Press; 1970.

  • 27. Hugo, P, Koch, H. Production of porous alumina with defined bimodal pore structure. Ger Chem Eng. 1979;2:2430.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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