Rapid synthesis of La0.9Sr0.1Ga0.8Mg0.2O3−δ electrolyte by a CO2 laser and its electric properties for intermediate temperature solid state oxide full cells
Rapid synthesis of La0.9Sr0.1Ga0.8Mg0.2O3−δ electrolyte by a CO2 laser and its electric properties for intermediate temperature solid state oxide full cells
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DOI：
10.1016/j.jpowsour.2010.03.092
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发表时间：
2010-10
影响因子：
9.2
通讯作者：
Jie Zhang;E. Liang;Xiangdan Zhang
中科院分区：
文献类型：
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作者：
Jie Zhang;E. Liang;Xiangdan Zhang
采用激光快速凝固法合成了固体氧化物燃料电池的优良电解液La0.9Sr0.1Ga0.8Mg0.2O3LSGM(LSGM)。结果表明，在优化的合成条件下，用该方法可在几秒钟内合成出纯的钙钛矿LSGM相，并以致密堆积、相对有序的脊状块体形式凝固，相对密度为98.5%。这种独特的显微组织是由热传递方向决定的熔池中定向生长的晶体所致。结果表明，与固相反应合成的样品相比，LRS合成的样品具有更好的电学性能。在600℃、700℃和800℃下测得的−-1的电导率分别为0.027、0.079和0.134Scm，远高于相同纯度和密度的固相反应合成的样品。
A laser rapid solidification (LRS) method has been developed for the synthesis of La0.9Sr0.1Ga0.8Mg0.2O3−δ(LSGM), an excellent electrolyte for solid oxide fuel cells. It is shown that pure perovskite LSGM phase can be produced within a few seconds with this method under optimized synthetic conditions and it solidified in densely packed and relatively ordered ridge-like blocks with a relative density of 98.5%. The unique microstructures are attributed to the oriented crystalline growth in the molten pool dictated by heat transfer directions. It is found that the samples synthesized by LRS exhibit superior electrical properties for fuel cell applications to those by solid state reactions. The conductivities of 0.027, 0.079 and 0.134Scm−1measured at 600, 700 and 800°C, respectively are much higher than those of the samples synthesized by solid state reactions with similar purity and density.