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Structural Origin of Recovered Ferroelectricity in BaTiO3 Nanoparticles



Bruce D. Ravel, Trevor Tyson, Han Zhang, Sizhan Liu, SANJIT GHOSE, U.J. Idehenre, Yury Barnakov, S.A. Basun, D.R. Evans


Nanoscale BaTiO3 particles (10 nm) prepared by ball-milling a mixture of oleic acid and heptane have been reported to have an electric polarization several times larger than that for bulk BaTiO3. In this work, detailed local, intermediate, and long-range structural studies are combined with spectroscopic measurements to develop a model structure of these materials. The X-ray spectroscopic measurements reveal large Ti off-centering as the key factor producing the large spontaneous polarization in the nanoparticles. Temperature-dependent lattice parameter changes reveal the sharpening of the structural phase transitions in these BaTiO3 nanoparticles compared to the pure nanoparticle systems. Sharp crystalline-type peaks in the barium oleate Raman spectra suggest that this component in the composite core-shell matrix, a product of mechanochemical synthesis, stabilizes an enhanced polar structural phase of the BaTiO3 core nanoparticles.
Physical Review B


EXAFS, ferroelectricity, barium titanate, nanoparticle


Ravel, B. , Tyson, T. , Zhang, H. , Liu, S. , GHOSE, S. , Idehenre, U. , Barnakov, Y. , Basun, S. and Evans, D. (2023), Structural Origin of Recovered Ferroelectricity in BaTiO3 Nanoparticles, Physical Review B, [online], (Accessed June 21, 2024)


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Created August 24, 2023, Updated September 19, 2023