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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:25 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Solid State Physics and Materials Science
Title:
Sol-gel synthesis and characterization of BaTiO3 doped-(Bi1/2Na1/2)TiO3 piezoelectric ceramics
Authors:
Roxana Radu(1), Horia V.Alexandru(2), Berbecaru Ciceron(2)
Affiliation:
1) National Institute of Materials Physics,Bucharest-Magurele,
2) University of Bucharest, Department of Solid State and Material Science,Bucharest,Romania
E-mail
roxana@infim.ro, horia@infim.ro, berbecaru2ciceron@yahoo.com
Keywords:
(Bi1/2Na1/2)0.92Ba0.08TiO3, sol-gel process, nanoparticles, piezoelectric ceramics
Abstract:
(Bi1/2Na1/2)TiO3 doped with 8 mol%BaTiO3 was prepared by an acetate-alkoxide sol-gel method. The evolution of the structure and microstructure of the precursor gel heated at temperatures up to 700 °C was studied by various techniques. The SEM analyses showed a microstructure consisting of nano-sized grains (~30 nm, at 500 °C and 50 nm at 700 °C temperature annealing). The dried gel powder was found to be amorphous, and then crystallizes on the perovskite structure of tetragonal (Bi1/2Na1/2)TiO3 at 600 °C, for 3h in air. The ceramics of composition corresponding to 0.92(Bi1/2Na1/2)TiO3-0.08BaTiO3, manufactured from the as-prepared nanostructured powder, presented good characteristics for piezoelectric applications.
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