Microstructure, crystalline phase and electrical properties of Li0.06(Na0.5K0.5)0.94Nb(1-2x/5)MgxO3 lead-free piezoelectric ceramics

Hai-tao Li; Bo-ping Zhang; Qian Zhang; Peng-peng Shang; Gao-lei Zhao

doi:10.1007/s12613-010-0316-6

Volume 17 Issue 3

Jun. 2010

Turn off MathJax

Article Contents

Abstract

International Journal of Minerals, Metallurgy and Materials > 2010 > 17(3): 340-346. > DOI: 10.1007/s12613-010-0316-6

Hai-tao Li, Bo-ping Zhang, Qian Zhang, Peng-peng Shang, and Gao-lei Zhao, Microstructure, crystalline phase and electrical properties of Li_0.06(Na_0.5K_0.5)_0.94Nb_(1-2x/5)Mg_xO₃ lead-free piezoelectric ceramics, Int. J. Miner. Metall. Mater., 17(2010), No. 3, pp.340-346. https://dx.doi.org/10.1007/s12613-010-0316-6

Cite this article as:

PDF (2914 KB)

Microstructure, crystalline phase and electrical properties of Li_0.06(Na_0.5K_0.5)_0.94Nb_(1-2x/5)Mg_xO₃ lead-free piezoelectric ceramics

Hai-tao Li^1,2),
Bo-ping Zhang^1), ,,
Qian Zhang¹⁾,
Peng-peng Shang¹⁾ and
Gao-lei Zhao¹⁾

Author Affilications

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471003, China

Funds:

This work was financially supported by the Research Fund for the Doctoral Program of Higher Education of China (No.20090006110010), the National Basic Research Priorities Program of China (No.2007CB613301), and the Program of University-Industry Cooperation Supported by the Ministry of Education and Guangdong Province of China (No.2008B090500262).

Received: 23 June 2009; Revised: 04 July 2009; Accepted: 06 July 2009; Available Online: 13 June 2021

Graphical Abstract

Abstract

Abstract

MgO-modified Li_0.06(Na_0.5K_0.5)_0.94NbO₃ (L₆NKN) lead-free piezoelectric ceramics were synthesized by normal sintering at a relatively low temperature of 1000℃. The crystalline phase, microstructure, and electrical properties of the ceramics were investigated with a special emphasis on the influence of MgO content. The addition of MgO effectively improves the sinterability of the L₆NKN ceramics. X-ray diffraction analysis indicates that the morphotropic phase boundary (MPB) separating orthorhombic and tetragonal phases for the ceramics lies in the range of Mg doping content (x) from 0.3at% to 0.7at%. High electrical properties of the piezoelectric constant (d₃₃=238 pC/N), planar electromechanical coupling coefficient (k_p=41.5%), relative dielectric constant (ε_r=905), and remanent polarization (P_r=38.3 μC/cm²) are obtained from the specimen with x=0.5at%, which suggests that the Li_0.06(Na_0.5K_0.5)_0.94Nb_(1-2x/5)Mg_xO₃ (x=0.5at%) ceramic is a promising lead-free piezoelectric material.
- lead-free piezoelectric ceramics,
- sinterability,
- sintering,
- morphotropic phase boundary