| 水菱钇型碳酸钕的形成及聚甘油脂肪酸酯对结晶的影响 |
| Formation of Tengerite Type Neodymium Carbonate and Effect of Polyglyceryl Fatty Acid Ester on Crystallization |
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| 摘要: |
| 关键词: 结晶 水菱钇型碳酸钕 聚甘油脂肪酸酯 |
| 基金项目: |
| Abstract: Amorphous Neodymium carbonate was prepared by the precipitation reaction of neodymium chloride with ammonium bicarbonate in solution, and then aged at 60 ℃ to form crystalline neodymium carbonate. The feed molar ratio of n(NH4HCO3)/n(NdCl3 was 2.5, and the precipitation was carried out with or without addition of polyglyceryl fatty acid ester (PGFAE). The phase type and morphology of crystalline neodymium carbonates were examined by XRD and SEM, and the effect of PGFAE on the crystallization speed was investigated by volume change in deposit layer and in situ pH determination. The content of neodymium and chloride in crystals was analyzed, and the crystallization reaction or crystal growth characteristics were discussed. It was found that all the crystalline neodymium carbonates were tengerite type, and contained less crystalline water and chloride than that of lanthanite type neodymium carbonate crystallized at room temperature, which is beneficial to the production of neodymium carbonate with higher neodymium and lower chloride content. The addition of PGFAE not only could eliminate the foam formed during precipitation, but also could shorten crystallization time, and form large radiative-like shape conglomeration by the irregulative linkage of one dimension needle crystals. It is also suggested that the morphology and the chloride content of neodymium carbonate were dependent on the structure and crystal growth characteristics. |
| Keywords: tengerite type neodymium carbonate crystallization polyglyceryl fatty acid ester |
| 投稿时间：2005-04-25 修订日期：2005-06-22 |
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| 李永绣,黄婷,罗军明,周雪珍,何小彬.水菱钇型碳酸钕的形成及聚甘油脂肪酸酯对结晶的影响[J].无机化学学报,2005,21(10):1561-1565. |
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