BaCe_(1-x)Eu_xO_(3-δ)电解质的Raman谱与TG-DTA研究

Raman Spectra and TG-DTA of BaCe_(1-x)Eu_xO_(3-δ) Electrolyte

合成了初始摩尔比为Ba/(Ce+Eu)=1.0和1.1的钙钛矿型氧化物BaCe1-xEuxO3-δ(x=0.05,0.10,0.15,0.20)。XRD分析表明,过量Ba的样品Ba/(Ce+Eu)=1.1已成钙钛矿单相,样品Ba/(Ce+Eu)=1.0有微量CeO2相存在。Raman谱分析表明,微量CeO2相的产生是由于高温烧结时引起一定量BaO的蒸发引起的;样品Ba/(Ce+Eu)=1.1中过量的Ba对高温烧结时BaO的蒸发起到了补偿作用。热重(TGA)和差热分析(DTA)显示,样品长期放置在空气中,会与空气中的CO2发生一定的反应。

Perovskite oxides BaCe1-xEuxO3-δ （x = 0.05, 0. 10, 0. 15, 0. 20） were prepared by two starting ratios at Ba/（ Ce ＋ Eu） = 1.0 and 1.1. The X-ray diffraction analysis showed that the samples Ba./（ Ce ＋ Eu） = 1.1 with a slight barium excess at beginning crystallized in a single perovskite phase, while the samples with the Ba/（ Ce ＋ Eu） = 1.0 contained a trace of CeO2. The raman spectrum measurements indicated that a trace of CeO2 was due to the loss of some Ba ions during the high temperature sintering,while excessive Ba species for the samples with the Ba/（ Ce ＋ Eu） = 1.1 compensated the Ba loss during the high temperature sintering. The TGA and DTA results showed that the samples, exposed in air for along time, would react with CO2.