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首页> 外文期刊>World Journal of Nuclear Science and Technology >X-Ray and M?ssbauer Study of Magnetic Black Sand from Mayotte Island
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X-Ray and M?ssbauer Study of Magnetic Black Sand from Mayotte Island

机译：马约特岛的磁性黑沙的X射线和M？ssbauer研究

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摘要

Natural magnetic black sands are known from several sites often located in areas of volcanic origin. Their elemental and mineral composition provides information on the geology of their territory and depends on several factors occurred during their formation. A sample of black sand was collected on the seashore of the island of Mayotte in the Indian Ocean and its magnetic part was investigated by means of energy dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD), and M?ssbauer spectroscopy at room temperature. The mineral composition is dominantly magnetite, in good agreement with samples collected in other sites of volcanic origin. Contrary to pure magnetite, a relevant fraction of Ti was detected by EDS. The 16% Ti and 1% Mn content increase the magnetite lattice parameter to 8.4312 (25) ?. The broadening of XRD lines pointed towards a significant degree of disorder. This was confirmed by M?ssbauer spectroscopy and is attributed to the presence of Ti replacing Fe in the magnetite lattice. The presence of Ti modifies the local magnetic field on the Fe sites, leading to a broader and more complex M?ssbauer transmission spectrum with respect to the one of pure magnetite. To study the effect of temperature, samples were heated for 12 hours to 600°C and 800°C in argon and to 1000°C in air. Annealing in argon did not improve the crystallinity while annealing in air caused a complete decomposition of magnetite into hematite and pseudobrookite.
机译：从通常位于火山起源地区的几个地点已知天然磁性黑砂。它们的元素和矿物成分提供了有关其领土的地质信息，并取决于其形成过程中发生的几个因素。在印度洋马约特岛的海岸上收集了黑沙样品，并通过能量色散X射线能谱（EDS），粉末X射线衍射（XRD）和M2进行了研究。室温下的ssbauer光谱。矿物成分主要是磁铁矿，这与在其他火山成因地点采集的样品非常吻合。与纯磁铁矿相反，EDS检测到了钛的相关部分。 16％的Ti和1％的Mn含量使磁铁矿晶格参数增加到8.4312（25）Ω。 XRD线的拓宽表明存在很大程度的混乱。这是由Msssbauer光谱法证实的，并归因于磁铁矿晶格中存在Ti代替Fe。 Ti的存在改变了Fe位点上的局部磁场，从而导致相对于纯磁铁矿中的一种更广泛，更复杂的Msssbauer透射谱。为了研究温度的影响，将样品在氩气中分别加热至600°C和800°C 12小时，在空气中加热至1000°C。氩气退火不能改善结晶度，而在空气中退火会使磁铁矿完全分解成赤铁矿和假板钛矿。

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