Thermal decomposition as a preparative route to anhydrous rare earth nitrates
Thermal decomposition as a preparative route to anhydrous rare earth nitrates
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DOI：
10.1007/bf01904437
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发表时间：
1989-03
期刊：
影响因子：
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通讯作者：
M. Karppinen;P. Kyläkoski;L. Niinistö;C. Rodellas
中科院分区：
文献类型：
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作者：
M. Karppinen;P. Kyläkoski;L. Niinistö;C. Rodellas
用TG和DTA研究了稀土五硝酸根配合物的热分解。M2Ln（NO3）5·nH2O（M=NH4，Ln=La，Nd，Pr）在空气中经无水（NH4）2Ln（NO3）5分解为Ln（NO3）3，LnONO3，最后在600°C以上分解为Ln2O3。当M=K，Ln=La时，中间体K2La（NO3）5非常稳定，800 °C时生成KLaO2。除Nd外，在空气和氮气中均能检测到九硝基配合物M_3Ln_2（NO_3）_9，但其稳定性范围太窄，不能作为单一相进行制备分离。为了比较，记录了La（NO3）3·6H2O的TG和DSC曲线，其中La（NO3）3，特别是LaONO 3作为稳定的中间体出现。
Thermal decomposition of rare earth pentanitrato complexes has been studied by TG and DTA. M2Ln(NO3)5·nH2O (M=NH4, Ln=La, Nd, Pr) decomposes in air through anhydrous (NH4)2Ln(NO3)5to Ln(NO3)3, LnONO3and finally to Ln2O3above 600°C. When M=K and Ln=La, the intermediate K2La(NO3)5is remarkably stable and KLaO2is formed at 800°C. Except for Nd, the nonanitrato complex M3Ln2(NO3)9was detected during the degradation process in both air and nitrogen but its stability range is too narrow to allow its preparative isolation as single phase. For comparison, the TG and DSC curves were recorded for La(NO3)3·6H2O where La(NO3)3and especially LaONO3appear as stable intermediates.