Abstract
The internal friction (Qsu−1) and Young’s modulus (E) of BaTiO3-based ceramics were measured vs temperature from −100 °C to 150 °C. Rectangular bars of high-density (96 to 99 pct) ma-terials were driven electrostatically in flexural vibration at a resonance frequency of about 3 kHz, at maximum strain levels of about 10−6. The curves ofQ −1(T) andE(T) allow the study of the following three phase transformations: tetragonal to cubic (about 130 °C in pure material), orthorhombic to tetragonal (about 0 °C in pure material), and rhombohedral to orthorhombic (about −80 °C in pure material). Internal friction and modulus data were obtained on pure material and on materials doped with niobium and cobalt to give semiconducting and insulating X7R behavior. Permittivity, dielectric loss, and microstructure data are given and used to aid interpretation of the mechanical measurement data.
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This article is based on a presentation given in the Mechanics and Mechanisms of Material Damping Symposium, October 1993, in Pittsburgh, Pennsylvania, under the auspices of the SMD Physical Metallurgy Committee
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Duffy, W., Cheng, B.L., Gabbay, M. et al. Anelastic behavior of barium-titanate-based ceramic materials. Metall Mater Trans A 26, 1735–1739 (1995). https://doi.org/10.1007/BF02670760
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DOI: https://doi.org/10.1007/BF02670760