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Synthesis of MgO microspheres with nanosheets in a mechanical force reactor and its optical property

机译：机械力反应器中纳米片状MgO微球的合成及其光学性质

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摘要

MgO microspheres with leaf-like nanosheets structure were prepared by direct carbonation of calcined magnesite in a mechanical force reactor. XRD analysis indicates that the products is cubic MgO structure with a lattice constant of α = 0.421 nm. Its average diameter of MgO microsphere is in the range of 10-40 μm, and leaf-like nanosheets with thickness of 20-50 nm is single crystalline by SEM and TEM observation. By comparing SEM images of MgO microspheres and basic magnesium carbonate, microsphere structure has been formed during the thermal decomposition process of Mg(HCO_3)_2 aqueous solution, and not damaged during the formation of MgO at the temperature of 800 ℃. The formation mechanism of MgO microspheres with nanosheets was proposed in this paper. Photoluminescence property of MgO product was investigated, showing that emission peak at 335 nm was related to new energy levels induced by defects or defect levels generated.
机译：通过在机械力反应器中直接碳化煅烧的菱镁矿制备具有叶状纳米片结构的MgO微球。 XRD分析表明产物为立方MgO结构，晶格常数为α= 0.421 nm。其MgO微球的平均直径在10-40μm的范围内，并且通过SEM和TEM观察，厚度为20-50nm的叶状纳米片是单晶的。通过比较MgO微球和碱性碳酸镁的SEM图像，发现Mg（HCO_3）_2水溶液在热分解过程中形成了微球结构，在800℃温度下MgO的形成过程中未破坏微球结构。提出了纳米片状MgO微球的形成机理。研究了MgO产物的光致发光特性，表明在335 nm处的发射峰与缺陷或产生的缺陷能级引起的新能级有关。

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