Analysis of the temperature profiles during the combustion synthesis of doped lanthanum gallate

作者：Marinsek Marjan^*

来源：Materiali in Tehnologije, 2008, 42(2): 85-91.

• lanthanum gallate
• self-propagating-high-temperature synthesis
• citrate-nitrate combustion process
• kinetic analysis
• the Boddington method
• Freeman-Carrol

Strontium-, magnesium-, iron-doped lanthanum gallate was prepared by the citrate-nitrate combustion technique. The temperature profiles of the citrate-nitrate metal ions system were measured and analyzed by applying the Boddington method. On the basis of the temperature measurements it was possible to perform thermodynamic and kinetic analysis of the system. The Boddington parameters T-c, u, t(r), t(d), t(x), t*, tau(ad), alpha, G that are essential for the kinetic analysis were defined by means of calculated lambda, h, c(p) values of the combustion system and measured values of rho and Q. Arrhenius kinetics was assumed for the determination of the kinetic parameters such as the activation energy E-a, the expotential factor n and pre-expotential factor K-0' of the system. The activation energy for the combustion system was determined by the method of combustion-wave propagation velocity to be 34.8 kJ mol(-1), by the Boddington method to be 31.8 kJ mol(-1) and by the Freeman-Carroll method to be 33.1 kJ mol(-1).

• 出版日期2008-4