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1 Aug 2005

Volume 87, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 87, 054101 (2005); http://dx.doi.org/10.1063/1.2006209 (3 pages)

Xiuqin Chen, S. Yang, M Hasegawa, K. Kawabe, and S. Motojima
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Lattice distortion and polarization switching in calcium copper titanate

Sung-Yoon Chung

Appl. Phys. Lett. 87, 052901 (2005); http://dx.doi.org/10.1063/1.2001758 (3 pages) | Cited 33 times

Online Publication Date: 26 July 2005

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It is shown that CaCu3Ti4O12 grains in a polycrystalline specimen have domains and comparatively thick domain walls. The orientations of the domains within a grain were observed to be slightly tilted toward each other, suggesting the presence of lattice distortions. Multiple reflection spots in the electron diffraction pattern and misfit dislocations were also found in the domain walls. Kelvin probe force microscopy showed the variation in the surface potential of a grain by external electric fields, demonstrating the polarization of dipole moments. The influence of the local distortions on the formation of dipole moments is discussed in terms of the deviation from the cubic symmetry due to the small misfit between domains in a single grain of CaCu3Ti4O12 polycrystals.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
61.72.Lk Linear defects: dislocations, disclinations
61.72.Ff Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
77.22.Ej Polarization and depolarization
77.80.Dj Domain structure; hysteresis

Effects of applied electric field during postannealing on the tunable properties of (Ba,Sr)TiO3 thin films

Yidong Xia, Jinbo Cheng, Bai Pan, Di Wu, Xiangkang Meng, and Zhiguo Liu

Appl. Phys. Lett. 87, 052902 (2005); http://dx.doi.org/10.1063/1.2006982 (3 pages) | Cited 5 times

Online Publication Date: 27 July 2005

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The impact of postannealing in electric field on the structure, tunability, and dielectric behavior of rf magnetron sputtering derived (Ba,Sr)TiO3 films has been studied. It has been demonstrated that postannealing in the proper electric field can increase the dielectric constant and the tunability remarkably and destroy the symmetry of capacitance-voltage characteristics of the films. The increased out-of-plane lattice constant and the appearance of the hysteresis loops in the electric-annealed films indicated the formation of small polar regions with tetragonal structure, which are responsible for the increased dielectric constant and tunability. It was proposed that the segregation of Ti3+ ions caused by electric annealing could induce the formation of BaTiO3-like regions, which are ferroelectric at room temperature.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.55.-g Dielectric thin films
73.61.Ng Insulators
77.22.Ch Permittivity (dielectric function)
81.40.Gh Other heat and thermomechanical treatments
77.80.Dj Domain structure; hysteresis
68.55.-a Thin film structure and morphology
68.55.A- Nucleation and growth
81.15.Cd Deposition by sputtering
61.66.Fn Inorganic compounds

Polarization of strained BaTiO3/SrTiO3 artificial superlattice: First-principles study

Leejun Kim, Juho Kim, Donggeun Jung, Jaichan Lee, and Umesh V. Waghmare

Appl. Phys. Lett. 87, 052903 (2005); http://dx.doi.org/10.1063/1.2006216 (3 pages) | Cited 19 times

Online Publication Date: 29 July 2005

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We performed first-principles calculation to investigate the effect of epitaxial strain on lattice instabilities and polarization behavior of BaTiO3/SrTiO3 artificial lattice with very short stacking period, i.e., BaTiO3 1 unit cell/SrTiO3 1 unit cell (BTO/STO). The structural analysis of BTO∕STO artificial superlattice under in-plane compressive state showed enhanced stability of the tetragonal phase. On the other hand, the stability of monoclinic phase was enhanced when the BTO∕STO was in the in-plane tensile state. The phase transition from tetragonal to the monoclinic phase occurs at the misfit strain of −0.25%. As the misfit strain of BTO∕STO superlattice increases from −0.25% to −1.5% (in-plane compressive state), the tetragonal superlattice exhibits an increasing polarization along the [001] direction. In the monoclinic phase, the polarization of the superlattice rotates progressively toward [110] direction with increasing the misfit strain, and the magnitude of the polarization simultaneously increases with the rotation. The first-principles study shows that the phase stability and polarization vector is sensitively influenced by the lattice misfit strain.
Show PACS
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ej Polarization and depolarization
64.70.K- Solid-solid transitions
68.65.Cd Superlattices
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