热重分析
材料科学
纳米颗粒
正交晶系
麦金纳维
四方晶系
热分解
分析化学(期刊)
差热分析
吸光度
高分辨率透射电子显微镜
化学
透射电子显微镜
晶体结构
结晶学
衍射
纳米技术
冶金
光学
色谱法
物理
有机化学
硫化物
作者
Tasmira J. Malek,Sunil H. Chaki,M. P. Deshpande
标识
DOI:10.1016/j.physb.2018.07.024
摘要
Mackinawite FeS nanoparticles were synthesized by wet chemical reduction technique. The chemical composition of the nanoparticles determined by the energy dispersive analysis of X-ray (EDAX) showed them to be near stoichiometric and without any impurity. The X-ray diffraction (XRD) analysis showed the synthesized nanoparticles to be of single phase FeS and possess tetragonal unit cell structure with lattice parameters as a = 3.68 Å, c = 5.03 Å. The transmission electron microscopy showed the synthesized nanoparticles to be spherical in shape. The optical absorbance study revealed that the nanoparticles possess direct optical band gap of 2.39 eV. The thermogravimetric analysis exhibited two steps decomposition which was substantiated by the corresponding differential thermogravimetric peaks. The simultaneously recorded differential thermal analysis showed three regions of decomposition. The endothermic peak around 587 K is due to the solid state phase transformation of FeS structure to the orthorhombic MnP-type structure with space group Pnma. The kinetic parameters were evaluated by employing non-linear Kissinger-Akahira-Sunose method. The vibrating sample magnetometer study showed the nanoparticles samples to behave as super paramagnetic particles. All the obtained results are discussed in detail.
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