摘要
以硝酸锂、硝酸锰、硝酸铬和硝酸镍为原料,柠檬酸作为络合剂采用溶胶-凝胶法获得前驱体,将前驱体在空气气氛中焙烧制备了纳米LiMn1.90Cr0.05Ni0.05O4.采用DTA-TG对前驱体的热分解行为进行了研究,用XRD考察了合成产物的结构和纯度,用SEM对合成产物进行了形貌观察和尺寸测量.试验结果表明:经300℃预处理,450℃焙烧获得的尖晶石结构LiMn1.90Cr0.05Ni0.05O4相纯度高,而随着温度的升高产物中杂质相含量增加;合成产物的粒度和晶格常数随温度升高而增加,晶格畸变随温度升高而减小;300℃预处理后450℃焙烧合成产物的形貌呈球形,颗粒尺寸在40nm左右且分布均匀.
Nanocrystalline LiMn1.90Cr0.05Ni0.05O4 spinel oxides have been synthesized successfully from aqueous solution of metal nitrate containing citric acid as chelating agent by sol -gel method. The thermal behavior of the material has been examined by the method of DTA -TG. The construct and phase purity of LiMn1.90Cr0.05Ni0.05O4 powder has been analyzed by means of XRD. The morphologies and grain sizes measurement have been carried out by SEM. The results have shown that the quality of LiMn1.90Cr0.05Ni0.05O4 is highest after pretreatment at 300 ℃ and sintering at 450 ℃ and the impurity contents enhance with the increase of sintering temperature. The grain sizes and lattice constants tend to increase with the increase of temperature, however, lattice aberrances decline. Morphologies of LiMn2O4 after 300 ℃ pretreatment and sintering at 450 ℃ tend to sphericity. The average grain sizes are 40 nm and distribute evenly.
出处
《哈尔滨理工大学学报》
CAS
2004年第6期61-63,68,共4页
Journal of Harbin University of Science and Technology
基金
黑龙江省十五攻关项目(CC01A2201)
