Grain size tailoring and enhanced energy storage properties of two-step sintered Nd3+-doped AgNbO3. Issue 13 (October 2020)

• Record Type: Journal Article
• Authors: Ren, Pengrong; Ren, Dong; Sun, Liang; Yan, Fuxue; Yang, Shu; Zhao, Gaoyang
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 13(2020)
• Page Start: 4495
• Page End: 4502
• Publication Date: 2020-10
• Subjects: Antiferroelectric -- AgNbO3 -- Energy storage properties -- Grain size -- Sintering; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.05.076
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: AgNbO3 as a lead-free antiferroelectric material, has received widespread attention in recent years due to its promising application in the aspects of energy storage devices. However, the high remnant polarization and low breakdown strength limits its energy storage properties. In this work, Nd 3+ -doped AgNbO3 (Ag1−3x Ndx NbO3, x=0−0.015) ceramics were prepared and a two-step sintering method was employed. The introduction of Nd 3+ leads to the enhanced stability of the antiferroelectric phase, refined grain size and increased resistivity. Furthermore, by adjusting the pre-heating temperature in the two-step sintering, the homogeneity of microstructure is improved and the resistance of pre-heated samples increases by one order of magnitude compared with normally sintered samples, leading to the enhanced breakdown strength. Ag0.97 Nd0.01 NbO3 pre-heated at 1100 °C for 2 h exhibits promising energy storage properties, with a recoverable energy storage density of 3.2 J/cm 3 and energy efficiency of 52 % under an applied electric field of 210 kV/cm.