Charge compensation mechanisms of BaTiO3 ceramics co-doped with La2O3 and Bi2O3. Issue 4 (15th February 2022)

• Record Type: Journal Article
• Authors: Ma, Cuiying; Du, Huiling; Liu, Jia; Du, Xian; Feng, Danni
• Is Part Of: Ceramics international. Volume 48:Issue 4(2022)
• Page Start: 5428
• Page End: 5433
• Publication Date: 2022-02-15
• Subjects: BaTiO3-based ceramics -- Doping modification -- Charge balance compensation mechanisms -- Raman spectroscopy; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.086
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Doping modification is commonly used to improve the electrical properties of BaTiO3 (BT). In this study, the ((1- x )BT- x (Bi2 O3 –La2 O3 )) ceramics were synthesised to investigate the charge balance compensation mechanisms of BT ceramics co-doped with La2 O3 and Bi2 O3 as donors at A-site. The XRD results showed that a pseudo-cubic phase was formed by intruding dopants. The Raman spectroscopy revealed that the samples, which x = 0.10 and 0.16, had relatively more oxygen and titanium vacancies. After heat-treatment the samples in oxygen atmosphere, the dielectric constant of the sample with x = 0.10 was higher than that of the untreated, but for x = 0.16, it was almost no changed. These results indicated that the different charge balance compensation mechanism was exist in the samples with x = 0.10 and 0.16. Impedance measurements showed that the resistance tendency exhibited initial decrease and subsequent increase, leading to the electronic and ionic compensation mechanisms with x = 0.10 and 0.16, respectively. Ferroelectric properties also implied charge balance compensation mechanism transition, due to P s and P r were higher for x = 0.10 than for x = 0.16, respectively. This work provides a new strategy for modulating the electric properties of BT-based ceramics.