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Cobalt-bearing adamite from Cap Garonne, Mine du Pradet, France – structural relationship to olivenite and magnetic behavior
Zeitschrift für Kristallographie - Crystalline Materials ( IF 1.2 ) Pub Date : 2023-10-07 , DOI: 10.1515/zkri-2023-0037
Christian Paulsen 1 , Maximilian Kai Reimann 1 , Michael Holtkamp 1 , Valérie Galéa-Clolus 2 , Uwe Karst 1 , Rainer Pöttgen 1
Affiliation  

The crystal structure of cobalt-bearing adamite (Zn, Co)2AsO4OH (so-called cobalton adamite) from Mine du Pradet, Cap Garonne, France has been refined from single crystal X-ray diffraction data: Pnnm, a = 831.39(4), b = 852.67(6), c = 605.84(6) pm, wR = 0.0568, 901 F 2 values, 48 variables. The composition of the single crystal and the bulk sample with EDX and ICP-OES was determined as Zn1.94Co0.06(AsO4)OH and (Co0.085Ni0.037Cu0.270Zn1.608)AsO4OH. The Co2+, Ni2+ and Cu2+ incorporation in the bulk sample leads to Curie paramagnetism with an experimental moment of 2.85 µB/M 2+ cation and explains the pink color along with the greenish edges. The Raman spectrum shows the characteristic vibrations of the AsO4 tetrahedra and the MO5 pyramids as well as the O–H stretching mode. The adamite structure is closely related with the olivenite type (space group P21/n11). This structural relationship is discussed on the basis of a group–subgroup scheme (Bärnighausen formalism).

中文翻译:

产自法国 Pradet 矿区 Cap Garonne 的含钴金刚石 – 与橄榄石的结构关系和磁性行为

含钴金刚砂(Zn、Co)的晶体结构2亚砷酸4产自法国加龙角 Mine du Pradet 的 OH(所谓的钴金刚砂)已根据单晶 X 射线衍射数据进行精炼:PNN,A= 831.39(4),= 852.67(6),C= 605.84(6) 下午,w= 0.0568, 901F 2值,48 个变量。用 EDX 和 ICP-OES 测定单晶和块状样品的成分为 Zn1.940.06(AsO4)OH 和 (Co0.0850.0370.2701.608)AsO4哦。公司2+, 你2+和铜2+掺入大量样品中会产生居里顺磁性,实验矩为 2.85 µ/中号 2+阳离子并解释了粉红色和绿色边缘。拉曼光谱显示了 AsO 的特征振动4四面体和中号5金字塔以及 O-H 拉伸模式。亚当石结构与橄榄石类型(空间群21/n11)。这种结构关系是在群-子群方案(Bärnighausen 形式主义)的基础上讨论的。
更新日期:2023-10-07
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