【摘要】 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。更多还原

【Abstract】 The chemical stability of lanthanum oxide on the surface of La 2O 3 Mo cathode materials has been studied by high temperature X-ray photoelectron spectroscopy.The experimental results show that La 2O 3 is not stable chemically as reported by the former literature.In the La 2O 3 Mo cathode materials,some lattice-oxygen of La 2O 3 molecules separate from the others at high temperature in vacuum.La 2O 3 can be reduced to metallic lanthanum by molybdenum carbide(Mo 2C). The binding energy of metallic lanthanum is higher than that of La 2O 3.The La3d 5/2 binding energy of metallic lanthanum has been proved to be 835.96eV experimentally. This paper reports that experimental La3d3/2 binding energy of metallic lanthanum is 852.23eV at the first time.更多还原