Abstract: The metal compound oxide Mg_1.5Ti_1.25O₄ with a spinel-type structure was synthesized by the method of solid state reaction crystallization at fixed temperature. This spinel had versatile characteristics in respect of its chemical composition and stoichiometric number. It could be inserted or extracted some substitutable ions through changing stoichiometric number while keeping its own structure. Spinel-type metal compound oxide had advantages of better thermal stability, strong radiation resistance, simple preparation and good selectivity. The properties of Mg_1.5Ti_0.25O₄ such as XRD, Li⁺ extraction value, saturation capacity of exchange and distribution coefficient have been determined. The experimental results showed that this compound oxide had a stable structure. It could be inserted or extracted Li⁺ and has good Li⁺ selectivity and ion memory property. The samples which were treated by nitirc acid have a 9.7mmol/g ion exchange capacity for Li⁺.

Key words: spinel-type structure, metal compound oxide, ion exchange capacity

摘要： 一定温度下，用固相反应结晶的方法合成具有尖晶石结构的金属复合氧化物Mg_1.5Ti_1.25O₄。尖晶石型金属复合氧化物在化学组分及化学计量数方面有非常灵活的特性，在维持自身晶体结构不变的条件下，通过改变自身化学计量数的方法可插入或者抽出一些替换离子。尖晶石型金属复合氧化物作为离子交换剂具有热稳定性强、抗辐射能力强、合成简单以及良好的选择性等优点。本文对合成的尖晶石型金属复合氧化物Mg_1.5Ti_1.25O₄进行了实验表征，包括X射线衍射仪结构表征，检测酸性条件下Li⁺的抽出值、饱和交换容量值测量、分配系数测定等。实验研究结果表明，本复合氧化物结构稳定，能够插入或者抽出Li⁺，具有较高的Li⁺选择性和离子记忆性。用硝酸处理过的样品对Li⁺交换容量达到9.7mmol/g。

关键词: 尖晶石型结构, 复合金属氧化物, 离子交换容量