Abstract
Bismuth sodium titanate (Na1/2Bi1/2)TiO3 powders were prepared by the hydrothermal route with starting chemicals containing Ti (OC4H9)4, Bi (NO3)35H2O as Bi and Ti sources at 180°C for 48 h in a PTFE-lined autoclave. XRD result confirms the formation of a pure pervoskite structure for the synthesized powders. SEM observation shows that the powders consist of spherical particles in the range of 0.2~1.0 μm, exhibiting a mean particle size of 0.5 μm. Compared with (Na1/2Bi1/2)TiO3 ceramics made by the conventional solid state reaction method, the specimen made by the hydrothermal synthesis method has superior piezoelectric properties with its piezoelectric constant d33 attaining a relatively high value of 78 pC/N.
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