Y掺杂BaZrO_3质子导体的常压和高压合成及表征

Synthesis and Characterization of Y Doped BaZrO_3 Protonic Conductors under Common and High Pressure

利用固相反应法和高压高温法研究BaZr1-xYxO3(x=0,0.05,0.10,0.15,0.20)的合成.XRD和Raman谱结果表明,在常压和1 300℃进行固相反应不能得到纯立方钙钛矿相BaZr1-xYxO3.对上述样品进行高压(3.6 GPa)再处理,低掺杂量样品(x=0,0.05)在500℃时得到较纯的立方钙钛矿相,表明增加压力可促进固相反应;在高掺杂量样品(x≥0.1)中出现少量BaCO3和m-ZrO2相,表明增加压力不利于固相反应.高压合成样品的晶格常数和晶胞体积均小于常压合成的样品.保持压力不变,当温度为1 000℃时,各样品均出现明显的BaO杂相.表明在500℃时,高压处理可提高BaZr1-xYxO3的单相性.

Samples BaZr1-xYxO3 （x =0,0.05,0.10,0.15,0.20） were prepared by solid-state reaction method under high-pressure and high-temperature, XRD and Raman measurements show that the products obtained by solid state reaction method at 1 300 ℃ belonged to cubic perovskite structure, but part of high degree diffract peaks split slightly. The samples （x = 0,0. 05 ） were in pure cubic perovskite structure under high pressure （3.6 GPa） and temperature （500 ℃ ）, which shows that press can accelerate the reaction, But some BaCO3 and m-ZrO2 appeared in other samples （x ≥ 0. 1 ）, which shows that press baffled the reaction. Under 3.6 GPa at 1 000 ℃, the peaks of BaO appeared clearly and increased with the content of Y^3＋. Therefore, to synthesis cubic perovskite structure BaZr1-xYxO3 under high-pressure and high-temperature, the temperature should be below 500 ℃.