Browsing by Author "Zhou, Jing"

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    Ca(Mg1/3Ta2/3)O3 dielectric thin films: preparation, structure, mechanical and dielectric properties
    (Springer, 2016-05-17) Li, Runrun; Zhou, Jing; Chen, Wen; Zhang, Qi; Bao, Yiwang Bao
    The effects of annealing temperature on the crystallinity, grain size and hence mechanical and dielectric properties of Ca(Mg1/3Ta2/3)O3 (CMT) dielectric films were systematically studied. The CMT thin films were fabricated by an aqueous solution-gel technology and exhibited uniform, smooth and dense morphologies. The optimum pyrolysis temperature and time was 550 °C and 330 s, respectively. All the CMT films annealed from 650 to 800 °C show a single perovskite phase and the crystallization increases with increasing the annealed temperature but a secondary phase is observed in the film annealed at 900 °C. The hardness and reduced modulus were effectively enhanced by increasing the annealing temperature, which can be correlated to the crystallinity and densification improvements. Higher elastic recovery was observed for CMT films annealed at higher temperatures indicating less difficult recoveries for those films. We also noticed that the dielectric constants were improved for the samples annealed at higher temperature, which may enable higher performances for future microwave communication electronics.
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    Direct measurement of electric field-induced strains of a single lead zirconate titanate piezoelectric ceramic fibre under various conditions
    (Elsevier, 2014-09-29) Yang, Xiong; Zhou, Jing; Zhang, Sen; Shen, Jie; Chen, Wen; Tian, Jing; Zhang, Qi
    The electric field-induced strains (S-E) of a single PZT piezoelectric fibre were measured using a micro-displacement sensor. The effects of temperature and uniaxial compressive stress on S-E were also investigated. The results demonstrate that the S-E are strongly dependent on these factors. Both the maximum strain (Smax) and depoling field increase with the increase of applied electric field. The Smax value increases with the increase of frequency and remains constant after the frequency exceeds 20 Hz. Meanwhile, the remnant strain (Srem) continues to increase, due to the mismatch between the strain response and loading rates. The recoverable strain (Smax-Srem) goes up with the increase of temperature and reaches the maximum value at 140 °C. Under an increasing uniaxial compressive stress, both Smax and depoling field increase and reach the peak value at 3 MPa, and then decrease with further increase of stress.