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Composite piezoelectric thick films through a hybrid processing technique

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Abstract:
This thesis studies the development of piezoelectric thick films ( 5- 100 um) through a hybrid screen print - chemical solution method. The ceramic paste is screen printed on a substrate and infiltrated with a chemical solution to achieve full densification. Lead zirconate titanate (PZT) thick films are developed and are shown to have dielectric and piezoelectric properties that are comparable to bulk PZT. The hybrid method allows the development of piezoelectric composite systems through the choice of non identical phases for the screen printed matrix and the chemical solution. A low lead composition Barium strontium potassium titanate - bismuth magnesium titanate (BBMT) infiltrated with PZT and a fully lead free composition BBMT infiltrated with KNN is also developed and explored. BBMT is an incipient ferroelectric with very low remnant strain and a high electric field induced strain of 0.4 % at 60 kV/cm. These compositions are the first attempt in literature to incorporate an incipient ferroelectric into a thick film system to achieve high actuation. BBMT-PZT is shown to have a high dielectric constant of 2500 and a piezoelectric constant of 167 pm/V. BBMT-KNN has a dielectric constant of 900 and a piezoelectric constant of 75 pm/V which is comparable to that of PZT thick films reported in literature. The extrinsic effects of these films have been studied using the Rayleigh behavior of dielectric constant. These measurements indicate that the domains in thick films are clamped and have similar Rayleigh coefficients as thin films. Band excitation piezoforce microscope (BEPFM) was used to image and study the behavior of domains. All films show spatial segregation of domains indicating that the screen printed and solution phase behave differently. Finally, a region of domains with no reversal behavior is observed in BBMT-KNN indicating domain pinning.
Notes:
Thesis (Ph. D.)--Brown University, 2018

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Citation

Venugopal, Vineeth, "Composite piezoelectric thick films through a hybrid processing technique" (2018). Materials Science Engineering Theses and Dissertations. Brown Digital Repository. Brown University Library. https://doi.org/10.26300/xkcy-8v10

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