TY - GEN
T1 - Comparison between kinetic and thermodynamic effects on grain growth in nano-scale materials
AU - Chen, Zheng
AU - Liu, Feng
AU - Shen, Chengjin
AU - Fan, Yu
PY - 2011
Y1 - 2011
N2 - A detailed comparison between kinetic and thermodynamic effects on grain growth in nanocrystalline Gd doped ceria ceramics was given. From the thermodynamic standpoint, the evolution of grain size with annealing time can be described using an analytical model for grain boundary segregation upon isothermal grain growth. From the kinetic standpoint, the single isothermal grain growth can be understood in terms of a single, thermally-activated rate process with constant grain boundary energy, σb. The solute excess in grain boundaries increases with grain growth and tends to its saturated value, therefore, the inhibition of grain growth can be attributed to the reduction of grain boundary energy σb through solute segregation.
AB - A detailed comparison between kinetic and thermodynamic effects on grain growth in nanocrystalline Gd doped ceria ceramics was given. From the thermodynamic standpoint, the evolution of grain size with annealing time can be described using an analytical model for grain boundary segregation upon isothermal grain growth. From the kinetic standpoint, the single isothermal grain growth can be understood in terms of a single, thermally-activated rate process with constant grain boundary energy, σb. The solute excess in grain boundaries increases with grain growth and tends to its saturated value, therefore, the inhibition of grain growth can be attributed to the reduction of grain boundary energy σb through solute segregation.
KW - Grain boundary energy
KW - Grain growth
KW - Solute segregation
UR - http://www.scopus.com/inward/record.url?scp=79958273874&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.233-235.2439
DO - 10.4028/www.scientific.net/AMR.233-235.2439
M3 - 会议稿件
AN - SCOPUS:79958273874
SN - 9783037851197
T3 - Advanced Materials Research
SP - 2439
EP - 2442
BT - Fundamental of Chemical Engineering
T2 - 2011 International Conference on Chemical Engineering and Advanced Materials, CEAM 2011
Y2 - 28 May 2011 through 30 May 2011
ER -