Investigation on the segregation behavior of rare-earth ions at the silicon nitried-grain boundary phase interface

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As the sintering additive, La and Lu oxides that have the largest and the smallest, respectively, ionic radii among the lanthanide were selected. Silicon nitride sintered bodies were fabricated using the composition of (1-x)La_2O_3+xLu_2O_3(x=0, 0.1, 0.2, 0.3, …, 1), and their activation energies of the…transformation were determined. It was found that the energy value of x=0.3 was close to the one of x=1, which strongly suggests that rare-earth elements with small ionic radii would bond more strongly at the silicon nitried grain boundary interface.