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Kmet B, Kuščer D, Dutta S, Uršič H, Matavž A, Levassort F, Bobnar V, Malič B, Benčan A. Screen Printed Copper and Tantalum Modified Potassium Sodium Niobate Thick Films on Platinized Alumina Substrates. MATERIALS 2021; 14:ma14237137. [PMID: 34885292 PMCID: PMC8658548 DOI: 10.3390/ma14237137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/17/2021] [Accepted: 11/19/2021] [Indexed: 11/16/2022]
Abstract
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.
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Affiliation(s)
- Brigita Kmet
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
| | - Danjela Kuščer
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
| | - Soma Dutta
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Materials Science Division National Aerospace Laboratories, Bangalore 560017, India
| | - Hana Uršič
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
| | - Aleksander Matavž
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia
| | - Franck Levassort
- GREMAN UMR 7347, Université de Tours, CNRS, INSA-CVL, 37200 Tours, France;
| | - Vid Bobnar
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia
| | - Barbara Malič
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
| | - Andreja Benčan
- Electronic Ceramics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (B.K.); (D.K.); (S.D.); (H.U.); (B.M.)
- Condensed Matter Physics Department, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; (A.M.); (V.B.)
- Correspondence: ; Tel.: +386-1-477-3256
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