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26 Jun 2000

Volume 76, Issue 26, pp. 3849-4013

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Electron emission from Pb-based ferroelectrics, antiferroelectrics, and paraelectrics by pulse electric field

Yong Tae Kim, Ki Hyun Yoon, Tae Heui Kim, and Kyung Bong Park

Appl. Phys. Lett. 76, 3977 (2000); http://dx.doi.org/10.1063/1.126840 (3 pages) | Cited 3 times

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Pulse electric-field-induced electron emissions from Pb-based ferroelectrics, antiferroelectrics, and paraelectrics were investigated. The electron emission charge increased exponentially with applied pulse field regardless of the dielectric phases. Electrons were emitted at the falling point as well as at the rising point of an applied pulse field when the antiferroelectrics and paraelectrics were used. The variation of emission charge from antiferroelectrics and paraelectrics was similar to that from ferroelectrics, as the emission charge increased exponentially with the polarization change [Ps-(−Pr)]. © 2000 American Institute of Physics.
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79.70.+q Field emission, ionization, evaporation, and desorption
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ej Polarization and depolarization
77.80.Dj Domain structure; hysteresis

Optical properties of PbZrxTi1−xO3 on platinized silicon by infrared spectroscopic ellipsometry

Zhiming Huang, Xiangjiang Meng, Pingxiong Yang, Zhanhong Zhang, and Junhao Chu

Appl. Phys. Lett. 76, 3980 (2000); http://dx.doi.org/10.1063/1.126841 (3 pages) | Cited 28 times

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A method of analyzing infrared spectroscopic ellipsometry (IRSE) measurement data is proposed for lead zirconate titanate PbZrxTi1−xO3 (PZT) thin films grown on Pt/Ti/SiO2/Si substrates with x = 0.3 and 0.5. The IRSE data measured at an angle of incidence 75° for x = 0.3 and 70° for x = 0.5 are fitted by a dielectric function formula. The refractive index and extinction coefficient of PZT with x = 0.3 and 0.5 are determined in the spectral range of 2.5–12.5 μm. As the wavelength increases, the refractive index decreases, on the contrary, the extinction coefficient increases. The absorption coefficient for x = 0.5 is greater than that for x = 0.3 by a factor of 1.5. The effective static ionic charges have also been derived, which are smaller than they would be in a purely ionic material for PZT thin films. © 2000 American Institute of Physics.
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78.30.Hv Other nonmetallic inorganics
78.66.Nk Insulators
77.55.-g Dielectric thin films
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.-e Ferroelectricity and antiferroelectricity
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
77.22.Ch Permittivity (dielectric function)

Self-field ac losses of a twisted multifilamentary (Bi, Pb)2Sr2Ca2Cu3O10/AgAu tape

C. M. Friend and Y. B. Huang

Appl. Phys. Lett. 76, 3983 (2000); http://dx.doi.org/10.1063/1.126842 (3 pages) | Cited 1 time

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Self-field loss measurements at 77 K on a superconducting (Bi, Pb)2Sr2Ca2Cu3O10/AgAu tape with twisted filaments are presented. Using the first- and third-harmonic components of the electric field, the hysteretic losses are separated from the total loss. At peak transport currents less than half the critical current, the hysteretic losses are considerably reduced. However, sizable nonhysteretic losses are also observed. At higher currents, the hysteretic loss increases, dominating the total loss, and is similar to that for an untwisted tape. © 2000 American Institute of Physics.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.72.-h Cuprate superconductors
84.71.Mn Superconducting wires, fibers, and tapes

Atomic-level simulation of ferroelectricity in perovskite solid solutions

M. Sepliarsky, S. R. Phillpot, D. Wolf, M. G. Stachiotti, and R. L. Migoni

Appl. Phys. Lett. 76, 3986 (2000); http://dx.doi.org/10.1063/1.126843 (3 pages) | Cited 22 times

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Building on the insights gained from electronic-structure calculations and from experience obtained with an earlier atomic-level method, we developed an atomic-level simulation approach based on the traditional Buckingham potential with shell model which correctly reproduces the ferroelectric phase behavior and dielectric and piezoelectric properties of KNbO3. This approach now enables the simulation of solid solutions and defected systems; we illustrate this capability by elucidating the ferroelectric properties of a KTa0.5Nb0.5O3 random solid solution. © 2000 American Institute of Physics.
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77.65.-j Piezoelectricity and electromechanical effects
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ch Permittivity (dielectric function)
77.55.-g Dielectric thin films
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