27–29 Nov 2016
THE GREENERY RESORT KHAO YAI
Asia/Bangkok timezone

Enhanced piezoelectric properties and fatigue-free behavior of lead-free piezoelectric xBaZrO3-(0.85-x)BaTiO3-0.15CaTiO3 ceramics

29 Nov 2016, 14:35
15m
Room1 (Greenery)

Room1

Greenery

Oral Other related topics Falcon 1

Speaker

Dr Rangson Muanghlua (Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang)

Description

Lead-free xBaZrO3-(0.85-x)BaTiO3-0.15CaTiO3; x = 0.00-0.20 (xBZ) ceramics were successfully prepared using the conventional solid-state reaction method. X-ray diffraction data showed a pure-phase perovskite structure for compositions up to x < 0.200. At room temperature, x-ray diffraction patterns of ceramics with the composition range of 0.00 ≤ x < 0.10 possess tetragonal structure. Mixed-phase coexistence of tetragonal and rhombohedral phases were found at 0.10 ≤ x ≤ 0.15 and transformed to cubic for x > 0.125 according to the lowered Curie temperature. Raman scattering showed mixed phases of tetragonal and orthorhombic phases. Temperature-dependent dielectric data shows anomaly phase transitions determined by composition changes. Phase diagram was provided according to temperature-dependent dielectric data. Compositions near composition-induced phase transition provided enhanced ferroelectric and piezoelectric properties. Unipolar electric field induced strain of x = 0.125 ceramic shows surprisingly high longitudinal piezoelectric coefficient (d33*) of 2244 pm/V at relatively low electric field of 5 kV/cm. Fatigue measurement carried out on the morphotropic phase boundary composition showed a small degradation in maximum strain after 106 cycles using an applied field of 20 kV/cm at 10 Hz.

Primary author

Dr Rangson Muanghlua (Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang)

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