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本文采用高温光电子能谱方法对 L a2 O3- Mo阴极及碳化 L a2 O3- Mo阴极材料表面 L a2 O3 的化学稳定性进行了研究。实验结果表明 ,L a2 O3并不具备文献报道的极好的化学稳定性。材料中的 L a2 O3在高温、真空条件下 ,其部分晶格氧发生分离。 L a2 O3可以被 Mo2 C还原成单质 L a。单质 L a的结合能高于 L a2 O3的结合能。实验证实单质 L a3d5 / 2的结合能为 835 .96 e V,并首次给出 L a3d3/ 2的结合能实验数值为 85 2 .2 3e V。
In this paper, the chemical stability of L a 2 O 3 on the surface of L a 2 O 3 -Mo cathode and carbonized L a 2 O 3 -Mo cathode material has been investigated by high temperature photoelectron spectroscopy. The experimental results show that La2O3 does not have the excellent chemical stability reported in the literature. L a2 O3 in the material under high temperature and vacuum conditions, some of its lattice oxygen separation. L a2 O3 can be reduced by Mo2 C to L a. The binding energy of elemental L a is higher than that of L a 2 O 3. Experiments show that the binding energy of L a3d5 / 2 is 835.96 eV, and for the first time the binding energy of L a3d3 / 2 is 85 2 .23eV.