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提出了一个分散在γ－Ａｌ２Ｏ３表面的金属氧化物单层结构的表面对称模型．该模型认为金属氧化物单层结构符合以下规则：（１）金属氧化物的氧负离子将尽量保持与所在表面层的氧负离子相同的排列方式；（２）金属离子将根据所在表面层金属离子排布的对称性取与之相适应的排布方式；（３）金属离子和氧负离子都对分散单层的结构有影响．根据这些规则，对一价、二价、三价和六价金属氧化物的分散单层的具体形态进行了讨论．该模型预测的单层分散阈值与实验值符合得很好．提出了单层分散状态为一种中间状态的观点
A surface symmetry model of metal oxide monolayer dispersed on γ-Al2O3 surface is proposed. The model assumes that the metal oxide monolayer conforms to the following rules: (1) the oxygen anions of the metal oxide will try their best to maintain the same arrangement as the oxygen anions in the surface layer; (2) The symmetry of the fabric is taken in accordance with the arrangement of the arrangement; (3) both metal ions and oxygen anions have an impact on the structure of the dispersed monolayer. The specific morphology of monolayers of monovalent, divalent, trivalent, and hexavalent metal oxides are discussed in accordance with these rules. The monolayer dispersion threshold predicted by the model is in good agreement with the experimental data. A single layer dispersion state is proposed as an intermediate state