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Elastic and Dielectric Properties of Active Ag/BaTiO3 Composites

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Abstract

This study examines the elastic and dielectric properties of active composites consisting of barium titanate (BaTiO3) and silver (Ag) constituents using experimental and numerical approaches. The elastic constants including Young’s modulus, shear modulus and Poisson’s ratio were measured by resonant ultrasound spectroscopy (RUS), a nondestructive dynamic technique, while a dielectric (impedance) spectroscopy was used to measure the relative permittivity and dielectric loss at different frequencies. The dielectric tests were also conducted at temperature ranges from −50 to 200 °C where the two phase transformations of barium titanate at around 0 °C and 120 °C were examined. The experimental results in this study were compared to data available in the literature. In addition to the experimental work, a numerical method is also considered in order to study the effects of blending silver into barium titanate on the effective elastic and dielectric properties of the composite and the local field fluctuations. For this purpose, two micromechanics models describing the detailed composite microstructures were constructed. The first model is based on two dimensional (2D) images of realistic microstructures obtained by the scanning electronic microscopy (SEM), while the second model is based on randomly generated three-dimensional (3D) microstructures with spherical particles. The effects of loading direction, porosity, particle shape and dispersion were examined using the micromechanics models. Numerical predictions of the effective elastic and dielectric constants were compared to the experiment results.

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Acknowledgements

Part of this research is sponsored by the National Science Foundation under grant CMMI-1437086.

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Authors and Affiliations

  1. Mechanical Engineering Department, Texas A&M University, 400 Bizzell St, College Station, TX, 77843, USA

    J. Xing & A. H. Muliana

  2. Material Science Department, Texas A&M University, 575 Ross Street, College Station, TX, 77843, USA

    M. Radovic

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  1. J. Xing
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Correspondence to A. H. Muliana.

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Xing, J., Radovic, M. & Muliana, A.H. Elastic and Dielectric Properties of Active Ag/BaTiO3 Composites. Exp Mech 58, 645–660 (2018). https://doi.org/10.1007/s11340-017-0271-5

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