Novel SrTiO3-based ceramics with colossal permittivity, low dielectric loss, and high insulation resistivity via defect engineering. Issue 17 (1st September 2022)

• Record Type: Journal Article
• Authors: Wang, Bo; Pu, Yongping; Zhang, Lei; Shang, Yangchao; Ji, Jiamin; Wei, Tianchen; Ouyang, Tao; Zhou, Shiyu; Wang, Dawei
• Is Part Of: Ceramics international. Volume 48:Issue 17(2022)
• Page Start: 25484
• Page End: 25494
• Publication Date: 2022-09-01
• Subjects: Colossal permittivity -- High insulation resistivity -- Defect dipole -- Oxygen vacancy -- Amphoteric -- Resistance degradation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.05.227
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: It is a great challenge to high colossal permittivity (CP, Ɛ r ) in polycrystal ceramics together with low dielectric loss (tanδ) and high insulation resistivity (ρ) due to the miniaturization of electrical devices. In this contribution, the defect dipoles [ T i 4 + e − C e S r − e T i 4 + ] and [ C e S r − e T i 4 + ] have been actively induced in the Sr1-1.5 x Ce x TiO3 (SCT) systems by doping Ce ions with amphoteric nature to address this issue. The ultra-stable dielectric performance under the external stimulus, with Ɛ r = 12, 406 (with low variation of < ±10%) and tanδ <0.08, can be achieve in the x = 0.01 sample within the temperature range of 10–200 °C and at the frequencies ranging from 20 Hz to 1 MHz, accompanied by high insulation with ρ > 10 10 Ωcm with low degradation rate under harsh test conditions of 2–4.5 kV/cm. This work paves a path by multisite defect engineering to achieve high-performance CP ceramics.