tailieunhanh - Effect of temperature on dielectric, ferroelectric, and piezoelectric properties of KNLNS-BNKZ ceramics

Traditional ceramic technology combined with a two-step sintering technique has been applied to prepare ()()() (KNLNS-BNKZ) piezoelectric ceramics. The experimental results show that the ceramic samples have a pure perovskite structure with the coexistence of tetragonal and rhombohedral phases. | DALAT UNIVERSITY JOURNAL OF SCIENCE Volume 11 Issue 1 2021 34-43 EFFECT OF TEMPERATURE ON DIELECTRIC FERROELECTRIC AND PIEZOELECTRIC PROPERTIES OF KNLNS-BNKZ CERAMICS Phan Dinh Gioa Bui Thi Tuyet Nhunga a The Faculty of Electronics-Electrical engineering-Material technology Hue University of Sciences Thua Thien-Hue Vietnam Corresponding author Email pdg_55@ Article history Received September 1st 2020 Received in revised form October 29th 20202 Accepted November 26th 2020 Available online February 5th 2021 Tóm tắt Traditional ceramic technology combined with a two-step sintering technique has been applied to prepare KNLNS-BNKZ piezoelectric ceramics. The experimental results show that the ceramic samples have a pure perovskite structure with the coexistence of tetragonal and rhombohedral phases. Effects of temperature on the dielectric ferroelectric and piezoelectric properties of the ceramics were investigated in detail. The results show that the characteristic parameters for the piezoelectric and ferroelectric properties of the ceramics such as the electromechanical coupling coefficient kp the piezoelectric factor d31 and the remnant polarization Pr are largely stable from room temperature to 100 C. Từ khóa Dielectric Electromechanical coupling coefficient KNLNS-BNKZ ceramics Two-step sintering. DOI http 2021 Article type peer-reviewed Full-length research article Copyright 2021 The author s . Licensing This article is licensed under a CC BY-NC 34 DALAT UNIVERSITY JOURNAL OF SCIENCE NATURAL SCIENCES AND TECHNOLOGY 1. INTRODUCTION Due to their ability of interconverting mechanical energy to electrical energy and vice versa piezoelectric materials are indispensable parts in all ultrasonic devices Jaffe et al. 1971 Uchino 2000 . At present NbO3 KNN -based lead-free ceramic materials are attracting a lot of attention Tan et al. 2018