Abstract
Barium titanate (BaTiO 3) can be doped with La 3+ ions via partial substitution for Ba 2+ ions; charge balance is maintained by the creation of Ti 4+ vacancies. Samples processed in an atmosphere of 1 bar O 2 and a temperature of 1350°C are insulating and free from electronic defects associated with either O 2 loss or reduction of Ti 4+ to Ti 3+. The Curie temperature (T c) decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (ε′) maximum at T c occurs. For the composition Ba 1-xLa xTi 1-x/4O 3, where x = 0.05, ε′ has a maximum value of 19000 at 18°C, compared with a typical value of 10000 at 130°C in undoped BaTiO 3 ceramics. This value is the highest value reported for A-site-doped BaTiO 3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.
Original language | English |
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Pages (from-to) | 1957-1960 |
Number of pages | 4 |
Journal | Journal of the American Ceramic Society |
Volume | 81 |
Issue number | 7 |
DOIs | |
Publication status | Published - 31 Jul 1998 |