摘要
尽管某些研究者认为黄铁矿中确实存在有晶格金,但以前的研究都没有取得直接而充分的证据。为此,作者做了晶格金的萃取实验,使黄铁矿中的晶格金(离子金)形成[AuCl_4]-络合物,然后利用紫外—可见光谱证实了[AuCl_4]-的存在,从而取得了晶格金存在较为直接而充分的证据。作者认为,象黄铁矿中Fe^(2+)与Au^(+)的取代关系的理论解释不应局限于类质同象的传统理论上,而应用现代的配位场理论解释之。计算表明,只要温度足够高,Au^(+)是可以取代Fe^(2+)形成晶格金的。本文还通过穆斯鲍尔谱的研究,探讨了晶格金的形成机理。
A critical review is given by the authors here about the ionic gold or lattice gold in Pyrite.lt is found that,although the ionic gold in Pyrite really existed,the studies before have not shown any direct evidences to identify it.For the reason above, the leaching experiment of ionic gold in Pyrite was done by the authors, and the ultravioletvisible spectra was used to identify it. So, a direct evidence was gained to verify ionic gold in Pyrite.The authors use Ligand Field Theory to illustrate ionic gold. It is found that Mossbauer spectra is very useful to the explanation of the mechanism of ionic gold formation in pyrite.
关键词
黄铁矿
晶格金
萃取
穆斯鲍尔谱
Pyrite,ionic gold (lattice gold), leaching experiment) ultraviolet-visible spectra,Mossbauer spectra,ligand field theory.
