| Y1-xCaxBaCo2O5+δ的制备和性能表征 |
| Fabrication and Characterization of Y1-xCaxBaCo2O5+δ |
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| 摘要: 利用固相反应法合成了层状钙钛矿钴氧化物Y1-xCaxBaCo2O5+δ(x=0，0.1，0.15，0.2)材料，系统研究了材料的氧吸附性能和电输运性质。XRD结果表明Ca2+掺杂的样品具有母相YBaCo2O5+δ层状钙钛矿结构，随着Ca2+掺杂量的增加，样品的晶格参数增大。TG结果显示：从室温到1 273 K，所有样品经历了两次吸氧和脱氧的过程，Ca2+掺杂增强了样品的氧脱附性能。在中低温下，约650 K附近，吸氧量达到最大，同时，样品发生了半导体金属转变。Ca2+掺杂量的增加，半导体金属转变温度增大，电导率下降。半导体金属转变与氧变化量δ有关而电导率下降与Ca2+掺杂引起Co3+离子的增加有关。 |
| 关键词: 层状钙钛矿 半导体金属转变 氧吸附 电导率 |
| 基金项目: |
| Abstract: Layered perovskite cobalt oxide Y1-xCaxBaCo2O5+δ(x=0, 0.1, 0.15, 0.2) materials were synthesized by solid state reaction. Oxygen absorption and electrical transport properties of all the samples have been investigated. XRD results indicate that the structure of Ca2+ doped samples has the same Layered perovskite structure of parent phase YBaCo2O5+δ and their lattice constants increase with Ca2+ doping content increase. TG results present that all the samples experience two oxygen absorption and desorption processes from room temperature to 1 273 K and Ca2+ doping can enhance oxygen desorption property. At medium and low temperature (about 650 K), all the samples have the maximal oxygen absorption capability and have the semiconductor-metal transition at the same time. The increase of Ca2+ doping content increases the semiconductor-metal transition temperature and depresses the conductivity. It is argued that the semiconductor-metal transition is related to the oxygen variance δ and while the depression of conductivity is related to the increasing of Co3+ induced by Ca2+ doping. |
| Keywords: layered perovskite semiconductor-metal transition oxygen absorption conductivity |
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| 张亚梅,吴小山,刘家欢,韩汝取.Y1-xCaxBaCo2O5+δ的制备和性能表征[J].无机化学学报,2011,27(12):2362-2366. |
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