| 化学共沉淀法制备正铌酸镧过程中杂相的形成与控制 |
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| 引用本文： | 张志力,李永绣,刘蓓,黄惠珍,周浪. 化学共沉淀法制备正铌酸镧过程中杂相的形成与控制[J]. 中国有色金属学报, 2002, 12(4): 837-841 |
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| 作者姓名： | 张志力 李永绣 刘蓓 黄惠珍 周浪 |
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| 作者单位： | 南昌大学,化学与材料学院,南昌,330047 |
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| 基金项目： | 江西省自然科学基金资助项目(9950030); 清华大学新型陶瓷与精细工艺国家重点实验室开发课题资助项目(KF0001) |
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| 摘 要： | 从多酸化学的角度 ,讨论了在化学共沉淀法制备正铌酸镧 (LaNbO4 )过程中 ,不同 pH条件对产物相组成的影响。结果表明 :在酸性条件下 ,由于同多酸盐的析出 ,产物中有部分偏铌酸镧相K2 LaNb5O15存在 ;在碱性条件下 ,由于铌酸盐的水解受到抑制 ,可以制备得到相组成相对单一的正铌酸镧相 ;对酸性条件下得到的无定形前驱体粉末进行碱化处理可以降低烧成正铌酸镧相中的杂相含量。
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| 关 键 词： | 正铌酸镧 化学共沉淀法 偏铌酸镧相 |
| 文章编号： | 1004-0609(2002)04-0837-05 |
| 修稿时间： | 2001-09-02 |
Formation and control of byproduct produced during process of making LaNbO4 by coprecipitation approach |
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| ZHANG Zhi-li,LI Yong-xiu,LIU Pei,HUANG Hui-zhen,ZHOU Lang. Formation and control of byproduct produced during process of making LaNbO4 by coprecipitation approach[J]. The Chinese Journal of Nonferrous Metals, 2002, 12(4): 837-841 |
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| Authors: | ZHANG Zhi-li LI Yong-xiu LIU Pei HUANG Hui-zhen ZHOU Lang |
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| Abstract: | Lanthanum orthoniobate (LaNbO 4) amorphous precursors are prepared by coprecipitation approach, using K 3NbO 4 and LaCl 3 as the raw reagents. From polyacid chemistry, the influence of homo-polyniobate on the phase constitution of LaNbO 4 is investigated. The XRD patterns reveal that the hydrolization of niobate can be restrained in an alkaline system, so pure LaNbO 4 can be obtained. The DSC analysis also confirms that in an acid system, there is byproduct K 2LaNb 5O 15 in the product due to the hydrolization of homo-polyniobate. The content of K 2LaNb 5O 15 in acid powder can be reduced by alkaline treatment. |
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| Keywords: | lanthanum orthoniobate coprecipitation K 2LaNb 5O 15 |
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