Temperature-insensitive dielectric and piezoelectric properties in (1-x)K_0.5Na_0.5Nb_0.997Cu_0.0075O₃-xSrZrO₃ ceramics

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• 作者：Pengrong Ren^a ; ^{renpengrongxaut@126.com} ; Zicheng Liu^a ; Mingyang Wei^a ; Laijun Liu^b ; Jing Shi^c ; Fuxue Yan^a ; Huiqing Fan^d ; Gaoyang Zhao^a
• 关键词：K0.5Na0.5NbO3 ; Phase transition ; Dielectric ; Piezoelectric
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：37
• 期：5
• 页码：2091-2097
• 全文大小：3502 K
• 卷排序：37

文摘

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.