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  • 1
    Electronic Resource
    Electronic Resource
    Substituent effects on the mechanical quality factor of Pb(Mg1/3Nb2/3)O3–PbTiO3 and Pb(Sc1/2Nb1/2)O3–PbTiO3 ceramics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1455-1458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The mechanical quality factor of Pb(Mg1/3Nb2/3)O3–PbTiO3(PMN–PT) and Pb(Sc1/2Nb1/2)O3–PbTiO3(PSN–PT) ceramics have been investigated for compositions close to the morphotropic phase boundary. Investigations were performed for various types of lower valent substituents on the B-site cation. These investigations have shown significant differences between the modified PMN–PT and PSN–PT crystalline solutions. In PMN–PT, lower valent substitutents had little effect upon the mechanical quality factor; however in PSN–PT it was found to be significantly increased. A crystal chemical approach is then used to explain these differences. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379248
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  • 2
    Electronic Resource
    Electronic Resource
    Substituent-introduction of "hard" polarization characteristics in "soft" Pb(BIBII)O3–PbTiO3 ferroelectric ceramics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3928-3933 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The polarization versus field (P–E) characteristics of modified Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) and Pb(Sc1/2Nb1/2)O3–PbTiO3 (PSN–PT) ceramics has been investigated for compositions close to the morphotropic phase boundary. Investigations were performed for various types of lower valent substituents on the B-site cation positions. It has been found possible to introduce "hard" P–E characteristics in "soft" PMN–PT and PSN–PT ferroelectric ceramics. In PMN–PT, only Mn was found to be effective in introducing such characteristics, however, in PSN–PT various lower valent substituents on higher valent sites were found to be effective. The results indicate that using a defect-engineering approach that it may be possible to develop materials with combinatory characteristics of hard and soft ferroelectrics. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1351864
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  • 3
    Electronic Resource
    Electronic Resource
    Relaxational polarization dynamics in soft ferroelectrics (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 133-135 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Investigations of the frequency dependence of the P–E (polarization versus field) and cursive-epsilon–E (strain versus field) behavior have been performed on soft 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 polycrystalline ferroelectrics at various maximum field strengths below and above that of the coercive field (Ec). For E〈Ec, a strong relaxational polarization was observed. At low frequencies, in this field range, P–E curves indicative of polarization switching were observed with an apparent remanence, however at higher frequencies near-linear P–E behavior was found. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126900
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  • 4
    Electronic Resource
    Electronic Resource
    High Power Characterization of Piezoelectric Materials (1998)
    Springer
    Journal of electroceramics 2 (1998), S. 33-40 
    Details
    ISSN: 1573-8663
    Keywords: high power ; piezoelectric ; resonance/antiresonance ; pulse drive method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three techniques for measuring high voltage/power piezoelectric properties, which have been developed recently, are compared: a voltage-constant piezoelectric resonance method, a current-constant piezoelectric resonance method, and a pulse drive method. The conventional resonance method with a constant voltage circuit exhibits significant distortion (or a hysteresis) in the resonance frequency spectrum under a high vibration level due to large elastic non-linearity, which limits precise determination of the electromechanical coupling parameters. To the contrary, the resonance method with a constant current circuit (i.e., constant velocity) can determine the coupling parameters more precisely from a perfectly-symmetrical resonance spectrum. The general problem in both resonance methods is heat generation in the sample during the measurement. In order to separate the temperature characteristic from the non-linearity, it is recommended that the pulse method be used in parallel, even though the accuracy is not very high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009962925948
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