Electromechanical properties of paper‐derived potassium sodium niobate piezoelectric ceramics. Issue 11 (26th July 2022)

• Record Type: Journal Article
• Authors: Wahl, Larissa; Maier, Juliana Gabriele; Schmiedeke, Samuel; Pham, The‐An; Fey, Tobias; Webber, Kyle Grant; Travitzky, Nahum; Khansur, Neamul Hayet
• Is Part Of: Journal of the American Ceramic Society. Volume 105:Issue 11(2022)
• Page Start: 6755
• Page End: 6764
• Publication Date: 2022-07-26
• Subjects: KNN -- lead‐free ferroelectrics -- paper‐derived ceramics -- piezoelectrics; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18655
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The small‐signal dielectric and piezoelectric coefficients of paper‐derived sodium potassium niobate, K0.5 Na0.5 NbO3 (KNN), were compared with those of conventionally prepared samples. Results show similar functional properties of paper‐derived KNN without significantly decreasing the small‐signal piezoelectric coefficient. The structure and microstructure analysis of conventional KNN and paper‐derived KNN did not reveal any significant difference in the crystal structure and grain size. However, the temperature‐dependent inter‐ferroelectric phase transition temperature estimated from the temperature‐dependent dielectric permittivity data revealed a decrease of approximately 18°C for the paper‐derived KNN and is possibly associated with the structural and microstructural defects. This work indicates that optimizing suspension chemistry and sintering conditions will be critical to enhance the functional response of paper‐derived KNN further. Moreover, paper‐derived ceramic processing, a novel and cost‐effective additive manufacturing technology, can be potentially used to fabricate other electroceramics with a wide range of porosities and sizes as well as complex geometries and multilayer structures.