Effects of Na nonstoichiometry in (Bi0.5Na0.5+x)TiO3 ceramics

Sung, Y. S.; Kim, J. M.; Cho, J. H.; Song, T. K.; Kim, M. H.; Chong, H. H.; Park, T. G.; Do, D.; Kim, S. S.
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p022901
Academic Journal
Effects of Na nonstoichiometry in (Bi0.5Na0.5+x)TiO3 ceramics were investigated in the range of x=(-5)-(+1) mol % of Na0.5. A rhombohedral perovskite structure was maintained at all compositions with no secondary phases. Grain size decreased with Na nonstoichiometry. Piezoelectric coefficient (d33) increased from 74 pC/N at x=0 up to 91 pC/N at x=-3.5 then dropped with further Na deficiency. Depolarization temperature (Td), on the other hand, decreased from 190 °C at x=0 down to 112 °C at x=-3.5 then increased. Rhombohedral lattice distortion (90-α) decreasing with Na deficiency was a key factor for the variation in d33 and Td.


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