Dispersivity ferroelectric phase transition of La-doped BaZr0.1Ti0.89Fe0.01O3 ceramics

• Published in: Journal of materials science. Materials in electronics 2019-12, Vol.30 (24), p.21316-21322
• Main Authors: Liu, Yun, Zheng, Zhanshen, Li, Yuanliang, Xi, Kaibiao, Mi, Yueshan, Kang, Wenshuo, Zhao, Rujie
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal structure; Curie temperature; Dielectric properties; Dispersion; Domains; Doping; Ferroelectric materials; Ferroelectricity; Lanthanum oxides; Low temperature; Materials Science; Optical and Electronic Materials; Perovskites; Phase transitions; Sol-gel processes
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-02508-1

BaZr 0.1 Ti 0.89 Fe 0.01 O 3 (BZTF)was prepared by sol–gel method using Ba(CH 3 COO) 2 , ZrO(NO 3 ) 2 and [CH 3 (CH 2 ) 3 O] 4 Ti as crude materials, La 2 O 3 and Fe 2 O 3 as doping materials, changing the amount of dopant and using different sintering temperatures. The influence of La doping on the crystal structure, micro structure and diffuse ferroelectric phase transition of the sample were investigated. XRD results showed that all samples showed a characteristic peak of a single perovskite type. The appropriate doping amount of La 3+ can improve the electrical performance of the sample. With the increase in La content, the degree of lattice distortion of the sample increases, causing the Curie temperature to move toward the low temperature. At the same time, the increase in the degree of dispersion of ferroelectric phase transitions can be attributed to the growth of grains and the reduction of long-range ordered domains. When doped with 0.6 mol% La, the sample has the highest degree of dispersivity ferroelectric phase transition, and the dielectric properties is the best:( ε 25℃  = 5680, tan δ  = 0.044, T c  = 42℃, γ  = 1.89).