【摘要】 采用溶胶-凝胶法制备了La2Mo2O9氧离子导体,并利用XRD、X射线光电子能谱对其制备条件和氧物种进行了分析.研究表明,凝胶前驱体在600℃焙烧可以形成La2Mo2O9晶相.提高焙烧温度,有利于晶粒生长和致密化.XPS分析表明,La2Mo2O9中金属离子均处于其最高价态,只有晶格氧物种存在,没有吸附态的氧物种.高温相中各元素的结合能均较低温相高,可能归结于高温相立方结构中金属和氧的键合程度高于其在低温相的键合程度.更多还原

【Abstract】 La₂Mo₂O₉ oxygen ion conductor was prepared by sol-gel method and characterized by means of X-ray diffraction and X-ray photoelectron spectra.The XRD results show that the La₂Mo₂O₉ crystalline phase formed at 600℃ for 10 h.Elevation of the calcination temperature prompted the grain growth and densification.XPS analyses indicate that there is no adsorbing oxygen species but crystal lattice oxygen species existing;and the metal ions are at the highest valence state.The binding energies of the elements in high temperature phase are higher than those in low temperature phase.It is due to the high bond intensity between metal ion and oxygen in the high temperature cubic structure.更多还原