采用光电子能谱分析方法对掺杂 L a2 O3的 Mo粉的性能进行了研究。结果表明 :掺杂 L a(NO3) 3的 Mo O2 粉经过还原处理后 ,Mo粉表面的纳米 L a2 O3微粒可以减小 Mo基体的特征能量损失峰 ,增加 Mo3d光电子谱峰强度 ;由于纳米 L a2 O3粒...采用光电子能谱分析方法对掺杂 L a2 O3的 Mo粉的性能进行了研究。结果表明 :掺杂 L a(NO3) 3的 Mo O2 粉经过还原处理后 ,Mo粉表面的纳米 L a2 O3微粒可以减小 Mo基体的特征能量损失峰 ,增加 Mo3d光电子谱峰强度 ;由于纳米 L a2 O3粒子在金属 Mo的表面及周围对 Mo起到包埋效应 ,减小了 Mo与大气的接触面积 ,从而使展开更多
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...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。展开更多
The carbonization kinetics of La 2O 3 Mo cathode materials was studied by thermal analysis method. Three stage model of the carbonization was presented. The carbonization rate is initially controlled by chemical react...The carbonization kinetics of La 2O 3 Mo cathode materials was studied by thermal analysis method. Three stage model of the carbonization was presented. The carbonization rate is initially controlled by chemical reaction, then by chemical reaction mixed with diffusion, finally by diffusion. The experimental data are processed according to this model and the correlation coefficients of the kinetic curves are satisfactory. The apparent activation energy of carbonization of La 2O 3 Mo cathode materials was obtained. At the same time, the empirical expressions of the rate constant against temperature in the temperature range of 1?393～1?493?K were deduced.展开更多
文摘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。
文摘The carbonization kinetics of La 2O 3 Mo cathode materials was studied by thermal analysis method. Three stage model of the carbonization was presented. The carbonization rate is initially controlled by chemical reaction, then by chemical reaction mixed with diffusion, finally by diffusion. The experimental data are processed according to this model and the correlation coefficients of the kinetic curves are satisfactory. The apparent activation energy of carbonization of La 2O 3 Mo cathode materials was obtained. At the same time, the empirical expressions of the rate constant against temperature in the temperature range of 1?393～1?493?K were deduced.
