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[求助] 跪求LaCoO3除杂相方法

用沉淀法合成的LaCoO3,用氨水沉淀的,离心超声抽滤洗涤数次,焙烧,可是XRD中显示总有含N的杂相,洗涤次数增多杂相扔不见少,有没有其他洗涤方法能把多于的氨水都洗去或者有什么办法能除去杂相??跪求大神解答!!!急急急!!
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