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Processing of yttrium-doped barium zirconate for high proton conductivity

机译：钇掺杂锆酸钡的加工以获得高质子传导性

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摘要

The factors governing the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size (50-100 nm) and high-temperature sintering (1600℃) in the presence of excess barium were essential. By this procedure, BaZr_(0.8)Y_(0.2)O_(3-δ) with 93% to 99% theoretical density and total (bulk plus grain boundary) conductivity of 7.9 x 10~(-3) S/cm at 600℃ [as measured by alternating current (ac) impedance spectroscopy under humidified nitrogen] could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria-like precipitates and a bulk conductivity that was reduced by more than 2 orders of magnitude.
机译：已经探索了控制钇掺杂锆酸钡（BYZ）的传输特性的因素，目的是在充分致密的样品中获得可重现的质子传导性。结果表明，在存在过量钡的情况下，小粒径（50-100 nm）和高温烧结（1600℃）是必不可少的。通过该程序，BaZr_（0.8）Y_（0.2）O_（3-δ）的理论密度为93％至99％，在600℃下的总电导率为7.9 x 10〜（-3）S / cm（散装加晶界）可以可靠地制备[通过在湿润的氮气下通过交流（ac）阻抗谱测量的结果]。在不存在过量钡的情况下烧结的样品显示出类似氧化钇的沉淀，其体积电导率降低了2个数量级以上。

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