Microstructures of ordered Ba(Cd 1/3Ta 2/3)O 3 perovskite dielectric ceramics with and without a boron additive have been observed by atomic resolution transmission electron microscopy (TEM). The selected area electron diffraction and lattice image show a well-ordered structure with hexagonal symmetry (lattice constants of a∼5.8 Å and c∼7.1 Å) in the ordered Ba(Cd 1/3Ta 2/3)O 3 with a boron additive, which is similar to those in ordered Ba(Zn 1/3Ta 2/3)O 3 and Ba(Mg 1/3Ta 2/3)O 3 ceramics. Ordered domains with a twin crystallographic relationship and high-density domain interfaces induced by ordering were observed in the ordered Ba(Cd 1/3Ta 2/3)O 3 without a boron additive sintered at a relatively high temperature. Atomic resolution TEM further revealed the conservative twin boundaries along (001) and (110) planes and non-conservative antiphase boundaries with a projected displacement vector of the type  in the ordered Ba(Cd 1/3Ta 2/3)O 3 without a boron additive. Finally, the energetics of different domain interfaces are discussed with the interfacial structures in ordered Ba(Cd 1/3Ta 2/3)O 3 ceramics revealed by an electron microscope.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the American Ceramic Society|
|State||Published - Mar 1 2006|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry