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地质学报  2012 

白云鄂博原型钡铁钛石晶体化学研究的新进展

, PP. 829-836

Keywords: 钡铁钛石,晶体结构,晶体化学式,晶胞参数

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Abstract:

钡铁钛石是白云鄂博REE-Nb-Fe矿发现的首个新矿物。迄今,已逾半个世纪。但是,关于原型钡铁钛石的化学分子式却有不同的表述,有的甚至殊异。拙文对这些写法各异的分子式进行了梳理,结合我们和国内外对原型钡铁石及其类似矿物的晶体结构测定,运用其最初发表的化学成分,按3种方法,重新计算矿物单位分子式中的离子数并分别加以评估。在此基础上,对原型钡铁钛石的晶体化学式作了初步改进。再者,关于原型钡铁钛石的晶胞参数,国内外亦存在歧见。主要根据晶体结构初步精修,借鉴东海产钡铁钛石晶体结构精测的启示,对原型钡铁钛石的真晶胞参数作了持之有据的推论。看来,原型钡铁钛石仍有深入研究的必要。可以肯定,它的晶体化学式、晶胞参数和晶体结构需要厘正、辩正和修正。

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