Magnesium oxide (MgO) nanoparticles were fabricated at the ambient temperature by a chemical precipitation method. The as-synthesized nanoparticles were analyzed by using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) equipped with energy dispersive X-ray spectrometer (EDS), particle size analyzer (PSA), Fourier transform infrared spectroscopy (FTIR), and UV–Vis absorption spectroscopy. The strain and crystallite size of the prepared nanopowders were studied by means of X-ray profile calculations. The size–strain plot (SSP) and Williamson–Hall (W–H) techniques were applied to investigate the effect of crystallite size and obtained strain in the lattice based on the peak broadening of MgO nanopowders. Various models such as size–strain plot (SSP), uniform deformation stress model (UDSM), uniform deformation model (UDM), and uniform deformation energy density model (UDEDM) method were applied to estimate certain physical parameters including strain, energy density, and stress values. Besides, the measured crystallite size by the above-mentioned models, FESEM, and TEM images and Scherrer's equation were compared to each other. The optical band gap energy of the nanoparticles estimated from the UV–Vis absorption spectrum was found to be equal to 4.6 and 4.9 eV.

通过化学沉淀法在环境温度下制备氧化镁 (MgO) 纳米颗粒。通过使用配备能量色散 X 射线光谱仪 (EDS)、粒度分析仪 (PSA) 的 X 射线衍射 (XRD)、透射电子显微镜 (TEM)、场发射扫描电子显微镜 (FESEM) 分析合成的纳米粒子、傅里叶变换红外光谱 (FTIR) 和紫外-可见吸收光谱。通过X射线分布计算研究了制备的纳米粉末的应变和微晶尺寸。应用尺寸-应变图 (SSP) 和威廉姆森-霍尔 (W-H) 技术来研究微晶尺寸的影响，并基于 MgO 纳米粉末的峰展宽获得的晶格应变。各种模型，例如尺寸应变图 (SSP)，采用均匀变形应力模型（UDSM）、均匀变形模型（UDM）和均匀变形能量密度模型（UDEDM）方法来估计某些物理参数，包括应变、能量密度和应力值。此外，将上述模型测得的微晶尺寸、FESEM 和 TEM 图像和谢乐方程相互比较。发现从 UV-Vis 吸收光谱估计的纳米粒子的光学带隙能量等于 4.6 和 4.9 eV。s 方程相互比较。发现从 UV-Vis 吸收光谱估计的纳米粒子的光学带隙能量等于 4.6 和 4.9 eV。s 方程相互比较。发现从 UV-Vis 吸收光谱估计的纳米粒子的光学带隙能量等于 4.6 和 4.9 eV。