Screen printed copper and tantalum modified potassium sodium niobate thick films on platinized alumina substrates

Kmet, Brigita and Kuscer, Danjela and Dutta, Soma and Ursic, Hana and Matavz, Aleksande and Levassort, Franck and Bobnar, Vid and Malic, Barbara and Bencan, Andreja (2021) Screen printed copper and tantalum modified potassium sodium niobate thick films on platinized alumina substrates. Materials, 14 (23). pp. 1-13. ISSN 19961944

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We show how sintering in different atmospheres affects the structural, microstructural, and functional properties of ~30 μm thick films of K0.5Na0.5NbO3 (KNN) modified with 0.38 mol% K5.4Cu1.3Ta10O29 and 1 mol% CuO. The films were screen printed on platinized alumina substrates and sintered at 1100 °C in oxygen or in air with or without the packing powder (PP). The films have a preferential crystallographic orientation of the monoclinic perovskite phase in the [100] and [−101] directions. Sintering in the presence of PP contributes to obtaining phase-pure films, which is not the case for the films sintered without any PP notwithstanding the sintering atmosphere. The latter group is characterized by a slightly finer grain size, from 0.1 μm to ~2 μm, and lower porosity, ~6% compared with ~13%. Using piezoresponse force microscopy (PFM) and electron backscatter diffraction (EBSD) analysis of oxygen-sintered films, we found that the perovskite grains are composed of multiple domains which are preferentially oriented. Thick films sintered in oxygen exhibit a piezoelectric d33 coefficient of 64 pm/V and an effective thickness coupling coefficient kt of 43%, as well as very low mechanical losses of less than 0.5%, making them promising candidates for lead-free piezoelectric energy harvesting applications.

Item Type: Article
Uncontrolled Keywords: Lead-free, KNN, Thick film; Microstructure, Electromechanical properties
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User: Mrs. Usha Kumari
Date Deposited: 18 May 2022 10:38
Last Modified: 18 May 2022 10:38

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