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    Revealing of Core Shell Effect on Frequency-Dependent Properties of Bi-based Relaxor/Ferroelectric Ceramic Composites.

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    Revealing of Core Shell Effect on Frequency-Dependent Properties of Bi-based RelaxorFerroelectric Ceramic Composites.pdf (1.432Mb)
    Date
    2018-09
    Author
    Saleem, Mohsin
    Hwan, Lim Dong
    Kim, In-Sung
    Kim, Min-Soo
    Maqbool, Adnan
    Nisar, Umair
    Pervez, Syed Atif
    Farooq, Umer
    Farooq, Muhammad Umer
    Khalil, Hafiz Muhammad Waseem
    Jeong, Soon-Jong
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    Abstract
    In this study, electromechanical characteristics of (1-x) BiNaTiO-xSrTiO (ST26, x = 0.26)/(1-y) BiNaTiO-ySrTiO (ST10, y = 0.1) (matrix/seed) composites were studied. The ST26 (high relaxor phase) and ST10 (a relaxor ferroelectric (RF), high ferroelectric phase) composite with large (r-ST26-ST10) and small (t-ST26-ST10) grains exhibited frequency-related dielectric properties and large strain response at a low triggering electric field (an incipient piezoelectricity). It is ascribed to a matrix-seed effect originating from the inhomogeneous composition due to the presence of two phases. The r-ST26-ST10 composite sintered at 4 h, prominent material, showed a high normalized dynamic strain (d*) of ~700 pm/V (large grains) with stable frequency dependence properties at a low field of 40 kV/cm. The properties of the r-ST26-ST10 composite exhibit less decay with frequency-related polarization and strain compared to those of t-ST26-ST10 composite. The increase in soaking time promotes the diffusion and homogenization of the microstructure in composites, leading to changes in the core-shell structure in the solid solution. The polarization and strain of the ST26-ST10 composites with the frequency are linked to the stability of the internal random fields created by non-ergodic relaxor phase of seed and the amount of phase change in the ergodic relaxor matrix.
    DOI/handle
    http://dx.doi.org/10.1038/s41598-018-32133-7
    http://hdl.handle.net/10576/11098
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