Ultrabroad temperature stability of stuffed tridymite-type BaAl2O4 co-doped by [Zn0.5Ti0.5]3+ with weak ferroelectricity. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Li, Jie; Lan, Xue-Kai; Du, Kang; Song, Xiao-Qiang; Lu, Wen-Zhong; Wang, Xiao-Hong; Lei, Wen
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part B
• Page Start: 22493
• Page End: 22497
• Publication Date: 2019-12-01
• Subjects: Structure -- Dielectric -- Ceramic; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.07.272
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The structure and dielectric properties of BaAl(2−2 x ) (Zn0.5 Ti0.5 )2 x O4 ceramics were investigated. Single-phase solid solutions in space group P63 (No. 173) were confirmed when 0% ≤ x ≤ 1.6%. [Zn0.5 /Ti0.5 ] 3+ averagely occupied four symmetrically inequivalent Al sites, and Al1/(Zn, Ti)–O, Al2/(Zn, Ti)–O and Al3/(Zn, Ti)–O bond lengths increased with increased x . Two dielectric anomalous peaks existed, the first peak referred to second-order ferroelectric transition. Stability was significantly improved by moving the first dielectric abnormal peak from 123 °C to −22 °C due to the lower atomic shift amplitude Δz of B cations along the polar axis. The co-doping of Zn 2+ and Ti 4+ played a decisive role in realizing an ultrabroad temperature range (−100 °C–700 °C) of stability (−27 ppm/°C ≤ TCC ≤ +10 ppm/°C), which met the conditions of C0G or NP0 multilayer ceramic capacitors (±30 ppm/°C). Superior insulating properties were performed by high resistivity of > 10 14 Ω cm.