Sarikaya, Y.Ada, K.Önal, M.2020-06-252020-06-252007closedAccess0925-8388https://doi.org10.1016/j.jallcom.2006.05.100https://hdl.handle.net/20.500.12587/3919Onal, Muserref/0000-0002-1540-8389The cylindrical compacts with the diameter of 14mm were prepared under 32MPa of an alumina powder having agglomeration degree of 80% and maximum surface area of 81 m(2) g(-1) after calcination at 900 degrees C for 2 h. Each compact was fired isothermally at a different temperature between 950 and 1150 degrees C for 2 h. The rate constant for each temperature was obtained from the application of the zero-order reaction rate model on the surface area measurements after sintering. Arrhenius equation for the sintering was obtained in the form: k = (8.09 x 10(6) m(2) mol(-1) s(-1)) exp (-187 643 J mol(-1)/RT). Transition state theory was applied to the sintering and thermodynamic parameters of the activation were calculated. The relation of these parameters in SI units can be summarized in the forms: Delta H-# = 178 643 - 8.314T, Delta S-# = -73.6 - 8.314 ln T, and ln K-# = -Delta G(#)/RT = -(Delta H-# - T Delta S-#)/RT= -21 487/T - ln T - 7.853, where Delta G(#), Delta H-#, Delta S-# and K-# are the Gibbs free energy, enthalpy, entropy, and equilibrium constant of activation. (c) 2006 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessactivation parametersaluminasintering ratesurface areatransition stateArticle4321-219419910.1016/j.jallcom.2006.05.1002-s2.0-33847392148Q1WOS:000245486300040Q1