Regulating the Structural, Transmittance, Ferroelectric, and Energy Storage Properties of K 0.5 Na 0.5 NbO 3 Ceramics Us
- PDF / 2,719,450 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 81 Downloads / 183 Views
https://doi.org/10.1007/s11664-020-08608-7 2020 The Minerals, Metals & Materials Society
ORIGINAL RESEARCH ARTICLE
Regulating the Structural, Transmittance, Ferroelectric, and Energy Storage Properties of K0.5Na0.5NbO3 Ceramics Using Sr(Yb0.5Nb0.5)O3 GANGBIN HU,1 HAONAN LIU,1 JIANGTING WANG,1 YABIN SUN,1 HUA WANG ,1,2,3 JIWEN XU,1,2 LING YANG,1,2 and CHANGRONG ZHOU1,2 1.—School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China. 2.—Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China. 3.—e-mail: [email protected]
Lead-free (1 x)K0.5Na0.5NbO3–xSr(Yb0.5Nb0.5)O3 (KNN–xSYbN, x = 0.15, 0.175, 0.20, 0.225, 0.25, 0.30) ceramics have been fabricated using the traditional solid-phase sintering method. The effects of Sr(Yb0.5Nb0.5)O3 doping on the microstructure, phase transition, and optical and electrical properties were investigated in detail. X-ray diffraction analysis revealed that the ceramics had pseudocubic phase structure. At x = 0.175, the near-infrared light transmittance of the ceramic reached 43.5% and the optical bandgap Eg was 2.89 eV. After introduction of Sr(Yb0.5Nb0.5)O3, the crystal grains of the ceramic became fine dense small cubes. Excessive doping (x ‡ 0.20) reduced the density of the ceramic and melted the ceramic surface. The ceramic with x = 0.175 exhibited optimized energy storage properties with Wrec = 0.21 J/ cm3 and g = 78.2%. The maximum dielectric constant of 1867.9 was obtained at x = 0.175, and its Tm peaks shifted toward lower temperature. The good insulation performance of the ceramics was confirmed by impedance spectroscopy. Key words: Transparent ceramics, phase structure, ferroelectric, energy storage
INTRODUCTION Transparent ceramics are new materials with excellent performance and wide applications. These materials form the basis of the development of new optoelectronic materials and equipment and are also key to electronic information technology, future optical computing technology, materials technology, and information technology.1–3 In addition to the inherent advantages of transparent ferroelectric ceramics, they also exhibit multifunctional properties, such as ferroelectric, piezoelectric, and photoelectric, thereby attracting intense attention;4 For
(Received July 26, 2020; accepted November 3, 2020)
example (Pb,La)(Zr,Ti)O3 (PLZT) ceramics exhibit an excellent photoelectric effect, while Pb(Mg1/3Nb2/3) O3–PbTiO3 (PMN–PT) is the most suitable for almost all optical applications in the visible to mid-infrared ranges.5,6 However, PLZT and PMN– PT suffer from various disadvantages, such as a poor hysteresis response to electric fields, aging and fatigue, and a reduction in the drive voltage, thus restricting their further development for use in electronic devices.7 In addition, PLZT and PMN-PT ceramics contain toxic lead, which is harmful to the environment.8,9 Therefore, the development of leadfree transparent ferroelectric
Data Loading...
