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在不同条件下制备出１６个不同超细氧化铝样品，在相同仪器条件下利用ＸＲＤ进行物相分析，研究了分散介质、处理方法、温度及烧结时间等对超细纳米氧化铝晶形结构的影响。结果表明，用分散剂（ＯＰＴ）处理制得的Ａ型超细氧化铝转晶温度较高，而不用（ＯＰＴ）对处理的Ｃ型超细氧化铝在低温就可转变，转晶温度差约２００℃。同时，烧结温度越高，恒温时间越长，超细氧化铝向稳定晶形转变，晶体成份增加。相反，温度低，恒温时间短时，多出现不稳定晶形，无定型成份增多。并对ＸＲＤ谱特征、形成原因以及与制备因素的关系进行了讨论。
Sixteen different ultrafine alumina samples were prepared under different conditions. Phase analysis was carried out by XRD under the same instrument conditions. The influence of dispersion medium, treatment method, temperature and sintering time on the crystal structure of ultrafine nano-alumina . The results show that the A-type ultrafine alumina prepared by the OPT treatment has a higher transformation temperature without OPT treatment. The C-type superfine alumina can be transformed at low temperature, 200 ° C. At the same time, the higher the sintering temperature, the longer the holding time, the more the fine alumina changes to the stable crystal form, and the more the crystal composition increases. On the contrary, the temperature is low, the thermostat time is short, more unstable crystalline forms, amorphous components increased. The characteristics of XRD, the formation reason and the relationship with preparation factors were discussed.