| As an important functional ceramics, ferroelectric ceramics are widely used in semiconductors and electronic components due to its superior performance, but most of wildly applied ferroelectric material containing Pb, e.g. PbZr1-xTixO3, can cause environmental pollution and be harmful to human health simultaneously. Thus, a new material need to be developed in order to replace its application in semiconducting electronic components. Recently, a new Pb-free ferroelectric ceramics BaTi2O5 was found with high Curie temperature, big dielectric constant. It could have a broad application prospects in semiconducting electronic components.At present, the Pb-free ferroelectric material BaTi2O5 has seriously restricted its application in practice due to cumbersome process, high cost of energy consumption, instability at high temperature, hard to sinter into density ceramic. In this paper, through choosing raw materials and preparation method, BaTi2-xZrxO5 powder was synthesized by a sol-gel method using barium acetate and tetrabutyl titanate as starting materials, anhydrous ethanol as solvent, acetyl acetone as a chelating agent and ZrO2 as stabilizing agent. The ground precursor was calcined at difference temperature between 400℃ 1280℃. The results showed that the precursor caclined below 600℃was amorphous, crystallization began at 700℃. the obtained particle was round in shape. The synthesized BaTi2-xZrxO5 was single-phase and stable at x=0.005～0.010 and 800℃ 1280℃.The calcined powder at 900℃was selected to prepare sintered body. The comparison results of high temperature stability of BaTi2-xZrxO5 sintered bodies by using different adding Zr4+ methods showed that the sintered samples of x=0.005 and x = 0.25 below 1280℃was in single phase by adding Zr4+ in liquid and solid state, respectively. Density test was found that maximum density of both sintered body by two kinds of introducing Zr4+ reached 95% and obviously improved compared with the similar preparation methods. |
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