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  • 1
    Electronic Resource
    Electronic Resource
    Piezoelectric properties of layered perovskite A2Ti2O7 (A=La and Nd) single-crystal fibers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4469-4471 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lanthanum and neodymium titanate A2Ti2O7 (A=La, Nd) single-crystal fibers were grown via the laser-heated pedestal growth technique. The single-crystal fibers were 600 μm in diameter and 3–4 cm in length. The piezoelectric, k23 and d23, and elastic compliance, s33, coefficients were measured using the standard resonance-antiresonance technique. From a comparison of the measured coefficients to poled single crystal data in the literature, it is concluded that the La2Ti2O7 single-crystal fiber grew in a single domain state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349078
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  • 2
    Electronic Resource
    Electronic Resource
    Structure order-disorder and dielectric response in perovskite-related SrO-Fe2O3-Nb2O5 system: The oxygen-deficient composition Sr(Fe1−xNbx)O2.5+y (x=0.17, 0.25, 0.50) (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3345-3356 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microstructures of materials with composition Sr(Fe1−xNbx)O2.5+y (x=0.17, 0.25, 0.50) have been investigated by powder x-ray diffraction (XRD) and transmission electron microscopy (TEM) examinations. XRD data for ceramic samples annealed under different P(O2) conditions could be indexed to a cubic perovskite. Superlattice diffraction spots have been observed by TEM investigation for the samples which were re-equilibrated by a subsequent annealing in a reducing atmosphere. A microdomain model is proposed to describe the observed phenomena. According to the model, the structure of reduced Sr(Fe1−xNbx)O2.5+y with x=0.17, 0.25 is considered to be a result of disordered intergrowth between brownmillerite-type Sr2Fe2O5 domains and perovskite-type Sr(Fe0.5Nb0.5)O3 domains. Brownmillerite-type domains are formed because of vacancy ordering. The order is extremely short ranged. Electron diffraction patterns constructed in terms of this microdomain model agree well with the observed results. The order-disorder transition can be altered by varying ambient oxygen partial pressures. For both ordered and disordered samples the frequency-domain dielectric response as a function of temperature is reported. Directly measured complex conductivity Y(ω) has been transformed by Kramers–Kronig relations in order to subtract the disturbances of G(0) and C(∞). The transformed temperature dependences have been further normalized and re-expressed in the form of master curves. For all the samples measured, the frequency-domain dielectric response deviates from the Debye model but follows the so-called universal power law behavior. The dielectric spectra for the samples in which brownmillerite-type ordering is identified show an anomalous low-frequency dispersion, while for the disordered samples, the relaxation behavior with a loss peak is observed. The variation of spectra shape with composition indicates that increasing Nb content tends to weaken the cooperative many-body interactions and causes the dielectric behavior to approach the Debye model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354560
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  • 3
    Electronic Resource
    Electronic Resource
    Strontium barium niobate single-crystal fibers: Optical and electro-optic properties (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3215-3222 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The room-temperature transverse electro-optic, rc, coefficient, halfwave voltage, Vπ, and temperature dependence of the birefringence, Δn0(T), were determined for Sr0.61Ba0.39Nb2O6 single-crystal fibers produced by the laser-heated pedestal growth technique. The effect cerium doping, 0.034 at. %, had on the measured properties is also reported. Concurrent measurements on a Czochralski-grown Sr0.61Ba0.39Nb2O6 single crystal enabled comparison of the single-crystal fibers to a bulk-grown single crystal. The growth rate of the Sr0.61Ba0.39Nb2O6 single-crystal fibers was approximately an order of magnitude greater than the Czochralski-grown Sr0.61Ba0.39Nb2O6 single crystal. The effect the rapid growth rate had on the optical properties is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349305
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  • 4
    Electronic Resource
    Electronic Resource
    Pyroelectric, dielectric, and piezoelectric properties of LiB3O5 (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7234-7239 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Selected tensor property coefficients of the nonlinear optical crystal LiB3O5 are reported. The full set of pyroelectric, dielectric, and thermal expansion coefficients were measured as a function of temperature. The five independent piezoelectric coefficients, the full set of electromechanical coupling coefficients, along with the compliance constants, were measured at room temperature. The material was found to be quite anisotropic in most property coefficients. The piezoelectric and electromechanical coupling coefficients were reasonably low, and comparisons are made between LiB3O5 and other borate crystals. The material showed strong ionic conductivity along the 〈001〉 direction, with a calculated activation energy for Li transport of 0.43 eV. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360435
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