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La_2O_3-Mo阴极La_2O_3纳米粒子形成的研究

Keywords: La2O3-Mo,阴极,纳米粒子

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Abstract:

采用XRD、SEM等方法对La2O3-Mo阴极中La2O3纳米粒子的形成进行了研究.在掺杂La(NO3)3的MoO2粉还原阶段,发生La2O3与MoO2的固溶及La2O3的脱溶,从而形成纳米La2O3粉末.Mo晶粒表面上的纳米La2O3微粒分布形式不同,导致了坯体材料中微米级和纳米级两种La2O3微粒的存在形式.另外,粉末态的La2O3纳米粒子在高温烧结过程中熔化,La-O键断裂形成的La3+、O2-离子通过固溶、脱溶过程亦可形成坯体中的La2O3纳米微粒.

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