Enhancement of p-type conductivity in nanocrystalline BaTiO3 ceramics

Xin Guo; Christian Pithan; Ohly, Christian; Chun-Lin Jia; Dornseiffer, Jügen; Haegel, Franz-Hubert; Waser, Rainer
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p082110
Academic Journal
Undoped BaTiO3 ceramic samples with an average grain size of ∼35 nm were prepared and the electrical properties investigated. The defect structure is dominated by acceptor impurities; therefore, the conductivity of nanocrystalline BaTiO3 is of p-type. Comparing with microcrystalline BaTiO3, the conductivity of nanocrystalline BaTiO3 is about 1 to 2 orders of magnitude higher and the activation energy remarkably lower, which is ascribed to a greatly reduced oxidation enthalpy in nanocrystalline BaTiO3 (∼0.3 versus ∼0.92 eV for microcrystalline BaTiO3).


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