1nm锰矿相结构稳定性的研究  

Study on structural stability of 1 nm manganates

作　　者：钱江初[1] 

机构地区：[1]国家海洋局第二海洋研究所

出　　处：《海洋学报》1998年第3期56-63,共8页

摘　　要：对在潮湿状态和经室温干燥后的人工合成Ｓｌｎｍ锰矿相进行Ｘ衍射测定结果显示：１ｎｍ锰矿相与０．７ｎｍ锰矿相之间存在某种相变关系，那些结构不稳定的Ｓ１ｎｍ锰矿相，由于干燥等原因而失去层间一ＯＨ－Ｈ２Ｏ层，而使原先的１ｎｍ相“崩塌”成为０．７ｎｍ锰矿相。１ｎｍ锰矿相结构稳定性主要是由被结合进层间的Ｃｕ、Ｃｏ、Ｎｉ等二价金属阳离子的特性与数量所决定的，其所含的金属阳离子的数量与其锰矿相的结构稳定性呈正相关，而不同的金属阳离子在稳定１ｎｍ锰矿相的结构的能力的大小可排列为：Ｎｉ＞Ｃｕ＞Ｃｏ＞Ｚｎ＞Ｃａ≥Ｍｇ＞Ｎａ．In order to study the relationship between 1 nm manganate and 0. 7 nm manganate , a series of S1nmM2+ manganates are made after the synthetic 1nm manganate (Slnm Na+ ) substituted with the different kinds of divalent cations. The X-ray deffraction analysis of SlnmM2+ manganates when they are wet and after 24 h room temperature dry shows their quite different characteristics of the d-spacing and indicates that there are phase changes between 1 nm manganate and 0. 7 nm manganate. Those 1 nm manganates with unstable layer structure will collapse to 0. 7 nm manganate by lossing one inter layer OH-H2O after RTD , while those with stable layer structure will still remain their lnm d-spacing. This fact remainds us that the samples of man- ganese nodules must be kept in wet when we do the mineral analysis to avoid the uncorrect results. The struc- tural stability of lnm manganate is mainly controlled by the interlayer divalent cations such as Cu ,Co and Ni. There is positive relationship between the interlayer contents of the divalent cations and their structural sta- bility , while the capacity of different cations in stabilizing the layer structure of 1nm manganate is as follows , Ni>Cu>Co>Zn>Ca>Mg>Na.

关 键 词：多金属结核 锰矿相 相变 结构稳定性 锰结核 

分 类 号：P744.3[天文地球—海洋科学]