检查共沉淀的Co0.7Mn0.3CrxFe2-xO4(x=0.0、0.2、0.4、0.6、0.8和1)铁氧体纳米颗粒的组成和热处理效果提供了对结构,形态学,光学,磁性,和这些材料的电性能。X射线衍射(XRD)和Rietveld细化分析证实了样品的尖晶石立方晶相,表明明确的晶体结构的形成。透射电子显微镜显微照片显示了所产生的样品的纳米级性质及其具有小标准偏差的窄粒度分布。这种均匀性通常在许多应用中是期望的,因为它证实了纳米颗粒的性质和行为的相似性。傅里叶变换红外光谱研究表明,Cr3离子在八面体位置的取代会影响分子的稳定性。退火引起键长的轻微膨胀和随后的稳定性降低。Cr3+离子的存在增强了试样的强度,而退火会削弱它们。这表明在确定材料强度时组成和加工条件之间的良好平衡。估计的光学间接带隙通过添加Cr3离子而经历红移。由于量子限制效应,在高温下退火会降低带隙,通过成分和热控制表明光学特性的可调性。x≥0.6的样品表现出几乎为零的矫顽力,指示超顺磁行为,它们有很好的应用。Cr3离子占据八面体B位的偏好会影响材料的磁性。添加Cr3+离子改善了介质极化和介质损耗,而交流电电导率下降。从阻抗谱,实部和虚部,Z\'和Z\',通过增加Cr含量而增加。此外,退火过程对试样的电性能有很大影响。总的来说,这项研究强调了构图之间错综复杂的关系,退火条件,以及由此产生的结构,磁性,Co-Mn-Cr铁氧体纳米粒子的电学性能,为电子产品中各种应用的定制材料的开发提供重要的观察,磁学,和医学。
Examining the composition and heat treatment effects of co-precipitated Co0.7Mn0.3CrxFe2-xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1) ferrite nanoparticles provides valuable insights into the structural, morphological, optical, magnetic, and electrical properties of these materials. X-ray diffraction (XRD) and Rietveld refinement analyses confirm the spinel cubic crystalline phase of the samples, indicating the formation of well-defined crystal structures. Transmission electron microscope micrographs manifest the nanoscale nature of the produced specimens and their narrow particle size distribution with a small standard deviation. This uniformity is often desirable in many applications because it confirms the similarity of the properties and behaviors of the nanoparticles. The Fourier transform infrared spectroscopy study suggests that the substitution of Cr3+ ions at octahedral sites influences molecular stability. Annealing causes a slight expansion in bond length and a subsequent decrease in stability. The presence of Cr3+ ions enhances the strength of the specimens, while annealing weakens them. This indicates a fine balance between composition and processing conditions in determining the strength of the materials. The estimated optical indirect bandgap undergoes a redshift by adding Cr3+ ions. Annealing at elevated temperatures reduces the bandgap due to the quantum confinement effect, indicating the tunability of optical properties through compositional and thermal control. Samples with x ≥ 0.6 exhibit nearly zero coercivity, indicating superparamagnetic behavior, which have promising applications. The preference of Cr3+ ions to occupy octahedral B-sites influences the magnetic behavior of the materials. The dielectric polarization and dielectric loss improved by adding Cr3+ ions, while the alternating current conductivity decreased. From impedance spectroscopy, the real and imaginary parts, Z\' and Z\", were increased by increasing Cr content. Furthermore, the annealing process greatly affects the electrical properties of the specimens. Overall, the study emphasizes the intricate relationship between composition, annealing conditions, and the resulting structural, magnetic, and electrical properties of Co-Mn-Cr ferrite nanoparticles, providing significant observations for the development of tailored materials for diverse applications in electronics, magnetics, and medicine.