Investigation of fracture toughness of modified (KxNa1 − x)NbO3 lead-free piezoelectric ceramics |
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| Authors: | Ezgi D Yilmaz Henry E Mgbemere Hüseyin Özcoban Rodrigo P Fernandes Gerold A Schneider |
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| Affiliation: | 1. College of Materials Science and Engineering, Sichuan University, 610064 Chengdu, China;2. Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), School of Architecture and Environment, Sichuan University, 610065 Chengdu, China;3. Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology, 610103 Chengdu, China;1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India;2. Department of Structure and Nano-/Micro-mechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, Düsseldorf 40237, Germany |
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| Abstract: | While most of the previous studies have focused on the processing and electrical properties of KNN-based ceramics, very little research has been carried out to evaluate their mechanical behavior. This work presents for the first time an examination of the fracture toughness, KIC, of the most widely studied (KxNa1 ? x)NbO3 (KNN)-based lead-free ceramics modified with lithium, tantalum and antimony. The samples were produced through the conventional mixed-oxide route and the KIC values were measured using the single edge V-notched beam (SEVNB) method under four-point bending. The mean KIC values were determined to be 0.48 ± 0.18 MPa m1/2 for (K0.48Na0.48Li0.04)NbO3, 0.8 ± 0.18 MPa m1/2 for (K0.5Na0.5)(Nb0.9Ta0.1)O3, 0.86 ± 0.04 MPa m1/2 for (K0.48Na0.48Li0.04)(Nb0.9Ta0.1)O3 and 1.06 ± 0.21 MPa m1/2 for (K0.48Na0.48Li0.04)(Nb0.86Ta0.1Sb0.04)O3 compositions. The microstructure, phase structure and dielectric constant values of the samples have been used to correlate the results of the KIC values. |
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