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为了解释界面上大的分散阈值与组分氧化物小的比表面之间的共存关系,在纳米尺度上提出了非单层分散模型,即各组分氧化物以球形八面体MeO6为单位,在二元氧化物界面上进行分散,八面体之间通过共用氧原子密置成为二维单层,再由有限个数这样的单层相互叠加而成为界面过渡层。该过渡层虽然是非单层的,但仍然属于非晶相,并具有非化学计量组成。具体计算了非单层模型的七个主要参数:每种组分氧化物的平均单层数分别为1.6～8.5,单层厚度为0.678～0.718nn3,叠加厚度为1.10～5.81 nm,过渡层总厚度分别为5.34～8.78 nm,以及各组分氧化物八面体的球形半径,密置单层容量和每百平米分散阈值。通过讨论非单层分散与非晶相之间的关联,概述了二元氧化物界面上非单层分散的晶相损失杌理以及界面的非晶相结构和对热的亚稳性。
In order to explain the coexistence of the large dispersion threshold at the interface with the small specific surface area of the component oxides, a non-monolayer dispersion model is proposed at the nanoscale, ie the oxide of each component is in the form of a spherical octahedral MeO6 Binary oxide dispersed on the interface, octahedron shared by the common oxygen atoms into a two-dimensional single-layer, and then by a limited number of such monolayers superimposed on each other as an interface transition layer. The transitional layer, although non-monolayer, still belongs to the amorphous phase and has a non-stoichiometric composition. The main parameters of the non-monolayer model are calculated as follows: the average monolayer number of each oxide is 1.6-8.5, the monolayer thickness is 0.678-0.718nn3, the superposition thickness is 1.10-5.80 nm, The thicknesses were 5.34 ~ 8.78 nm, and the spherical radii of each component oxide octahedron, the density of monolayer and the dispersion threshold per 100 m2. By discussing the correlation between non-monolayer dispersion and amorphous phase, the non-monolayer dispersed phase loss theory at binary oxide interface and the amorphous phase structure and thermal metastability are summarized.