Domains and size effect of Curie temperature in BaTiO3 nanoceramics has been studied in this paper. We have calculated Coulomb interaction in a single domain of multi-domains BaTiO3 grain, and obtained Curie temperature at various grain size. The results show that along with the grain size decreases, the change of Coulomb interaction depends on type of domains. 90 degree domains cause Coulomb interaction increase and Curie temperature moves to high temperature; 180 degree domains make Coulomb interaction weak and Curie temperature move...
