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10 Mar 2003

Volume 82, Issue 10, pp. 1497-1639

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 1610 (2003); http://dx.doi.org/10.1063/1.1559439 (3 pages)

Yong Chen, Douglas A. A. Ohlberg, Xuema Li, Duncan R. Stewart, R. Stanley Williams, Jan O. Jeppesen, Kent A. Nielsen, J. Fraser Stoddart, Deirdre L. Olynick, and Erik Anderson
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Recovery process of degraded ferroelectric properties in the forming-gas-annealed Pt/Bi4−xLaxTi3O12/Pt capacitor

Uong Chon and Hyun M. Jang

Appl. Phys. Lett. 82, 1577 (2003); http://dx.doi.org/10.1063/1.1558970 (3 pages) | Cited 4 times

Online Publication Date: 4 March 2003

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The recovery of ferroelectric properties in the forming-gas-annealed Pt/Bi4−xLaxTi3O12/Pt (Pt/BLT/Pt) capacitor was studied by examining changes in ferroelectric responses, phase evolution, and spatial distributions of relevant species during the recovery annealing. The degraded ferroelectric properties were practically restored to their original values after the recovery annealing at 600 °C for 10 min in an O2 atmosphere. The following recovery process has been delineated from the present study: (i) the removal of impregnated protons from the degraded capacitor due to the chemical potential difference of protons between the forming-gas-annealed capacitor and the contacting atmosphere, and (ii) the restoration of perovskite BLT phase with the help of replenishment of the Bi and oxygen losses via diffusion from the neighboring intact region to the Bi-depleted columnar region located beneath the top Pt electrode. © 2003 American Institute of Physics.
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices
84.32.Tt Capacitors
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
81.40.Gh Other heat and thermomechanical treatments
66.30.H- Self-diffusion and ionic conduction in nonmetals
77.80.Dj Domain structure; hysteresis
77.22.Ej Polarization and depolarization

Selective desorption of interfacial SiO2

M. Copel

Appl. Phys. Lett. 82, 1580 (2003); http://dx.doi.org/10.1063/1.1559647 (3 pages) | Cited 17 times

Online Publication Date: 4 March 2003

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In this letter, we report the selective thermal decomposition of SiO2 from a silicate/Si(001) interface, without silicidation of the dielectric. We observe kinetics that are similar to SiO2 desorption from Si(001), which takes place by SiO volatilization, suggesting that a similar mechanism is responsible at a buried interface. Interface desorption is a route to direct dielectric/silicon structures without prior removal of SiO2. © 2003 American Institute of Physics.
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79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
68.43.Vx Thermal desorption

Delayed fracture of lead zirconate titanate ferroelectric ceramics under sustained electric field

Y. Wang, W. Y. Chu, K. W. Gao, Y. J. Su, and L. J. Qiao

Appl. Phys. Lett. 82, 1583 (2003); http://dx.doi.org/10.1063/1.1558958 (3 pages) | Cited 10 times

Online Publication Date: 4 March 2003

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In this letter, we report on delayed fracture of lead zirconate titanate ceramics with a Zr/Ti ratio of 52/48(PZT-5) ferroelectric ceramics in silicon oil under sustained electric field, and that in silicon oil or moist atmosphere under sustained mechanical load. The experimental results show that sustained electric fields may cause delayed fracture of PZT-5 ceramics and there is a threshold field for the delayed fracture. The threshold electric field is less than one third of the critical electric field to cause instant fracture and is also half of the coercive field of the PZT-5 ceramics. © 2003 American Institute of Physics.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.65.-j Piezoelectricity and electromechanical effects
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
62.20.M- Structural failure of materials

Theory of polarization enhancement in epitaxial BaTiO3/SrTiO3 superlattices

J. B. Neaton and K. M. Rabe

Appl. Phys. Lett. 82, 1586 (2003); http://dx.doi.org/10.1063/1.1559651 (3 pages) | Cited 27 times

Online Publication Date: 4 March 2003

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The spontaneous polarization of epitaxial BaTiO3/SrTiO3 superlattices is studied as a function of composition using first-principles density-functional theory within the local density approximation. With the in-plane lattice parameter fixed to that of bulk SrTiO3, the computed superlattice polarization is enhanced above that of bulk BaTiO3 for superlattices with BaTiO3 fraction larger than 40%. In contrast to their bulk paraelectric character, the SrTiO3 layers are found to be tetragonal and polar, possessing nearly the same polarization as the BaTiO3 layers. General electrostatic arguments elucidate the origin of the polarization in the SrTiO3 layers, with important implications for other nanostructured ferroelectrics. © 2003 American Institute of Physics.
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77.55.-g Dielectric thin films
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ej Polarization and depolarization
68.65.Cd Superlattices

Voltage drop at interfaces in multilayer ferroelectrics

Xingjiao Li, Ningzhang Wang, Junbo Bao, Tao Chen, Jingping Xu, Hanhua Feng, and Shaoping Li

Appl. Phys. Lett. 82, 1589 (2003); http://dx.doi.org/10.1063/1.1556577 (3 pages)

Online Publication Date: 4 March 2003

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Based upon a defined surface barrier in ferroelectric multilayers deposited on (100) p-type silicon, ξVa, which bears a portion of the external electrical voltage, a modified empirical power law I = A(ξV)n is established for quantitatively describing detailed I–V dependence in ferroelectric multilayers. The voltage drop at the interface, Vi, which directly affects electrical characteristics of ferroelectric multiplayer system, is studied thoroughly. The voltage drop obtained from the modified empirical power law of the I–V dependence is consistent with that obtained from the C–V dependence model. © 2003 American Institute of Physics.
Show PACS
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
73.40.Ns Metal-nonmetal contacts
77.55.-g Dielectric thin films
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