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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2584-2586 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crack-free antiferroelectric PbZrO3(PZ) thin films were prepared by a two-step annealing technique via a modified sol-gel process. Although x-ray diffraction results showed that single phase of perovskite PbZrO3 was obtained in the thin films annealed at 550, 700, and 550 °C/700 °C, double P-E hysteresis loop indicating phase transformation from antiferroelectric to ferroelectric phase was only observed for the two-step annealed PZ thin film at room temperature, with a forward switching field (EAFE-FE) of 151 kV/cm, a backward switching field (EFE-AFE) of about 77 kV/cm, and saturated polarization of 54 μC/cm2. The dielectric constant and dielectric loss of the PZ film annealed at 700 °C are 260 and 0.04 at 1 kHz, respectively. The prevention of the PZ film from being cracking by the two-step annealing procedure is believed to be a result of the more stable property of the film caused by the 550 °C pre-annealing. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2035-2037 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By monitoring the electric current image during conducting atomic force microscopy nano-patterning, a phenomenon that we term "resonant conducting" was found. This was characterized by a sharp peak at V=2.45±0.05 V in the averaged current-voltage plot. The electrical current is irreversible and decays very rapidly after repeat scanning, which implies that the resonant current is associated with the transient process from a hydrogen de-passivation to an oxygen passivation under the specific electrical field. On the practical side, "resonant conducting" provides a very sensitive method for visualization of H passivation of silicon on a nano-meter scale. © 1997 American Institute of Physics.
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  • 3
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Imaging of the surface of a cleaved Bi2Sr2CaCu2O8+δ (BSCCO) single crystal with a scanning tunneling microscope reveals a series of repeating terraces, whose separations are then used to identify the atomic planes which are exposed. On each of the exposed planes, the incommensurate modulation is also clearly resolved with atomic resolution. The measured separations between the terraces lead to the deduction that any atomic layer can be exposed by mechanical cleavage of BSCCO. We, therefore, suggest that the identity of atomic planes, and the direction of tunneling, should always be taken into consideration when interpreting tunneling spectra obtained on such cleaved BSCCO crystals. © 1998 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1280-1286 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Experimental measurements are made for the steady-state frequency response of a supported thermocouple wire. In particular, the effects of axial heat conduction are demonstrated for both a supported one material wire (type K) and a two material wire (type T) with unequal material properties across the junction. The data for the amplitude ratio and phase angle are correlated to within 10% with the theoretical predictions of Fralick and Forney (1992) for a laser-heated junction with no bead. This is accomplished by choosing a natural frequency ωn for the wire data to correlate the first-order response at large gas temperature frequencies. Moreover, it is found that a large bead size (roughly twice the wire diameter) will increase the amplitude ratio at low frequencies and distort the phase angle. In the latter case, it is necessary to increase the thermocouple wire length by 20% in the theory to correlate the data when the junctions have beads (silver soldered).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1584-1588 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ambipolar diffusion of plasma particles in a column of inhomogeneous plasma containing dust grains is investigated analytically as well as numerically. The grains act as charge sinks and behave like an immobile but charge-varying negative background. They can lead to significant depletion of the electron density and decrease the diffusion scale length. The theoretically obtained election density distribution agrees well with that from experiment. © 2002 American Institute of Physics.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 253-255 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that a dusty plasma can admit dust-acoustic solitons on a very slow time scale involving the motion of dust grains, whose charge is self-consistently determined by local electron and ion currents. The solitons exist for a range of velocities and the peak amplitude increases almost linearly with the velocity. © 1997 American Institute of Physics.
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  • 7
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of a dust-ion-acoustic wave (DIAW) wave down the steep density gradient in an inhomogeneous diffusive dusty plasma is experimentally studied. It is observed that the presence of the dust enhances the plasma inhomogeneity. The phase velocity of the DIAW increases rapidly with distance and becomes supersonic. The interplay between the effects of the density nonuniformity and collisional damping results in the continuous transition of the relative amplitude of the DIAW from damping to growth. The experimental data are in agreement with theoretical prediction and confirm the importance of density-dependent ion–dust collisions. © 2001 American Institute of Physics.
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1506-1509 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A compact dispersion relation for parametric instabilities of an electromagnetic pump wave is derived, taking into account the dust-particle dynamics and the dust-grain charge fluctuations caused by wave motions in unmagnetized dusty plasmas. Specific results for quasistationary modulational and filamentation instabilities are presented. It is found that thresholds of these instabilities are reduced in the presence of quasistationary plasma slow response involving charged dust grains. The present investigation should be useful in understanding the nonlinear propagation of intense electromagnetic waves through dusty space and laboratory plasmas. © 1995 American Institute of Physics.
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2798-2804 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution and suspension of dust particles under the action of electrostatic, gravitational, ion-drag and neutral collision forces are investigated near the boundary of a dusty plasma. It is shown that the competition among the forces results in spatial oscillations (multi-layer) of the particle distribution. For sub-micron grains the ion-drag has a significant effect on the grain dynamics while for micrometer sized grains the gravity quickly dominates over other forces. The effect of the neutral gas flux is to enhance or diminish that of the gravity while the effect of the neutral viscosity is to shift the profile toward the wall. Under the force balance, the particles are suspended in a narrow region with sharp boundaries within the sheath. © 1997 American Institute of Physics.
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  • 10
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gold films prepared by neutral gold cluster deposition on the HF-treated Si(111) surface in a static argon atmosphere of 50 Pa have been characterized by scanning tunneling microscope in air at room temperature. Our studies demonstrate that the gold film is just the stacking up of clusters formed in the static argon atmosphere and shows dense random packing formation of clusters. The structure of the gold cluster-based nanophase film is very compact and stable.
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