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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 7
BKCSDE 33(7)
July 20, 2012 

Synthesis of High-Aspect-Ratio BaTiO3 Platelets by Topochemical Conversion and Fabrication of Textured Pb(Mg1/3Nb2/3)O3-32.5PbTiO3 Ceramics
Wei Zhao*, Lei E, Jing Ya, Zhifeng Liu, Heping Zhou
Grain growth, Topochemical microcrystal conversion, Piezoelectric properties, Perovskites
Perovskite structured barium titanate particles (BaTiO3) platelets were synthesized by molten salt synthesis and topochemical microcrystal conversion. As the precursors of BaTiO3, plate-like BaBi4Ti4O15 particles were first synthesized by the reaction of Bi4Ti3O12, BaCO3, and TiO2 at 1080 °C for 3 h in BaCl2-KCl molten salt. After the topochemical reactions, layer-structured BaBi4Ti4O15 particles transformed to the perovskite BaTiO3 platelets. BaTiO3 particles with thickness of approximately 0.5 μm and a length of 10-15 μm retained the morphology feature of the BaBi4Ti4O15 precursor. For <001> Pb(Mg1/3Nb2/3)O3-32.5PbTiO3 (PMNT)-5 wt % PbO piezoelectric ceramics textured with 5 vol % of BaTiO3 templates, the Lotgering factor reached 0.82, and d33 was 870 pC/N.
2305 - 2308
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