Dispersivity ferroelectric phase transition of La-doped BaZr0.1Ti0.89Fe0.01O3 ceramics
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BaZr0.1Ti0.89Fe0.01O3(BZTF)was prepared by sol–gel method using Ba(CH3COO)2, ZrO(NO3)2 and [CH3(CH2)3O]4Ti as crude materials, La2O3 and Fe2O3 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 La3+ 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:(ε25℃ = 5680, tanδ = 0.044, Tc = 42℃, γ = 1.89).
Here, I would like to thank my mentor Zhanshen Zheng and Yuanliang Li for their detailed and important guidance in the writing of the thesis. They gave me a lot of suggestions and research ideas.
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