Temperature-insensitive dielectric and piezoelectric properties in (1-x)K0.5Na0.5Nb0.997Cu0.0075O3-xSrZrO3 ceramics |
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| Affiliation: | 1. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China;2. College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. School of Electro-Mechanical Engineering, Xidian University, Xi’an, 710071, China;4. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China;1. Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Strasse 2, Darmstadt 64287, Germany;2. Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, D-79104 Freiburg, Germany;3. School of Materials Science and Engineering, UNIST, 50, UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, Republic of Korea;4. School of Materials Science and Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, Republic of Korea;1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;2. Materials R&D Department, Beijing Yuanliu Hongyuan Electronic Technology Company, Ltd., Beijing 102600, China |
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| Abstract: | Systematic investigation on phase transition, dielectric and piezoelectric properties of (1-x)K0.5Na0.5Nb0.997Cu0.0075O3-xSrZrO3 (x = 0, 0.03, 0.06, 0.09, 0.12, 0.15, abbreviated as KNNC-100xSZ) ceramics was carried out. Due to the coexistence of orthorhombic and tetragonal phase in a wide temperature range, a diffused polymorphic phase transition (PPT) region was achieved in KNNC with x ≥ 0.06. KNNC-12SZ ceramics exhibited high dielectric permittivity (～1679), low dielectric loss (～0.02) and small variation (Δe'/ε'25 °C ≤ 15%) in dielectric permittivity from ?78 °C to 237.3 °C. KNNC-6SZ ceramic possessed a high level of unipolar strain (～0.15%) and maintained a smaller variation of ±12% under the corresponding electric field of 60 kV cm?1 at 10 Hz from 25 °C to 175 °C. d33*, which was calculated according to the unipolar strain at 60 kV cm?1, was 230 pm V?1 and remained stable below 100 °C. Therefore, our work provided a new promising candidate for temperature-insensitive capacitors and piezoelectric actuators. |
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| Keywords: | Phase transition Dielectric Piezoelectric |
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