Browsing by Author "Furman, Eugene L."

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    Elastic stiffness constants of PZN-4.5%PT single crystal influenced by DC bias electric field applied at various directions to prototypic crystal symmetry
    (Taylor & Francis Ltd, 2005-01-01) Hána, Petr; Burianová, Lidmila; Zhang, Shu Jun; Shrout, Thomas Richard; Furman, Eugene L.; Ryzhenko, Volodymyr; Bury, Peter
    The purpose of this work was to characterize an influence of the electric bias field on the elastic stiffness constants of important and unusual piezoelectric material Lead Zinc Niobate-Lead Titanate (PZN-PT). The longitudinal and transverse mode of sound propagation in single crystals containing 4.5% PT were studied. The influence of electric field, which poles the sample, is investigated by the pulse-echo sound propagation technique. From these measurements, the values of complex elastic stiffness constants are evaluated at different poling conditions with different frequencies for longitudinal and sheer excitations. Crystal cuts [001], [110] and [111] served for measurements of the elastic stiffness constants under application of the electric field. Aspects of field-induced phase transitions in PZN-4.5%PT single crystals at room temperature are discussed. Hysteretic behavior has an influence on attenuation and velocity of ultrasound.
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    Hydrostatic piezoelectric coefficient d h of PZT ceramics and PZN-PT and PYN-PT single crystals
    (Technická Univerzita v Liberci, 2004-01-01) Burianová, Lidmila; Hána, Petr; Panoš, Stanislav; Furman, Eugene L.; Zhang, Shujun; Shrout, Thomas Richard
    The hydrostatic piezoelectric coefficient d h of Pb(Zr x Ti1 - x )O3 ceramics (PZT), and of Pb(Zn 1/3Nb2/ 3)O3-PbTiO3 and Pb(Yb 1/2Nb1/2)O3-PbTiO3 (PZN-PT, PYN-PT, respectively) single crystals with compositions near to the morphotropic phase boundary (MPB) have been measured using a dynamic hydrostatic method. The effects of DC electric field and static component of hydrostatic stress on d h of PZT ceramics, PZN-PT and PYN-PT single crystals were studied. Changes of the piezoelectric hydrostatic coefficients d h caused by an electric field (DC bias) were observed along with pressure and temperature dependencies. The measurement of the hydrostatic piezoelectric coefficient d h seems to be promising for investigation of intrinsic (single domain) and extrinsic (domain-walls) contributions to piezoelectric behavior of single crystals and ceramic materials. © 2004 Kluwer Academic Publishers.