Premium
Singular Grain Boundaries in Alumina Doped with Silica
Author(s) -
Kim Mi Jin,
Kim Seung Min,
Yoon Duk Yong
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00507.x
Subject(s) - grain boundary , materials science , doping , phase (matter) , triple junction , grain boundary strengthening , boundary (topology) , condensed matter physics , mineralogy , composite material , crystallography , geometry , microstructure , chemistry , mathematics , mathematical analysis , optoelectronics , physics , organic chemistry
Pure Al 2 O 3 powder compact sintered at 1400°C after adding 100 mol ppm of SiO 2 shows grain boundaries that are flat, even across the triple junctions. TEM observations show that these flat grain boundaries are parallel to the basal planes of the grains on one side. These flat grain boundaries must be singular. At such a low SiO 2 concentration and a low temperature, it is very unlikely that any liquid phase is present at these grain boundaries to cause such flat boundary shapes.