ChemInform Abstract: Dopant Distribution in Grain-Boundary Films in Calcia-Doped Silicon Nitride Ceramics.

✍ Scribed by Hui Gu; Xiaoqing Pan; Rowland M. Cannon; Manfred Ruehle

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 31 KB
• Volume: 30
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199913295

✦ Synopsis

Dopant Distribution in Grain-Boundary Films in Calcia-Doped Silicon Nitride Ceramics.

-Ca segregation to grain boundaries in a systematically Ca-doped Si 3 N 4 system is uniform along and across each grain boundary film. The segregation in the films saturates at a rather low level and the excess Ca atoms are located at the intersection regions between the amorphous films and the pockets. Ca segregation changes the film composition significantly because more N 3-ions are introduced and replace O 2-. This reduces the Van der Waals force on the film, whereas the creation of the electric double layer force is unlikely. -(GU, HUI; PAN, XIAOQING; CANNON,