Dielectric and magnetic properties of BaTiO3 –NiFe2O4 multiferroic composites

This study reports the various physical properties of (1�x)(0.3CoFe2O4-0.7BiFeO3)-xBaTiO3 composites (equivalently denoted as 0.3CFO-0.7BFO/BT) with the compositions x=0, 0.30, 0.35, 0.40 and 1.0. The composites are synthesized through a hybrid processing technique in which 0.3CFO–0.7BFO is prepared through a sol-gel process, and BT is processed through a solid state reaction method. Subsequently, the effects of the addition of BT on the structural, dielectric, magnetic and magneto-dielectric properties of 0.3CFO–0.7BFO have been investigated for various BT concentrations. The Rietveld refinement analysis of x-ray diffraction patterns reveals the structural distortion in the BFO phase with the addition of BT, while no such distortion has been observed for the CFO phase. Energy dispersive spectroscopy confirms the presence of two types of grains that correspond to the 0.3CFO–0.7BFO and BT phases in field emission scanning electron micrographs of the composites. Improved dielectric properties have been observed, which are associated with the improved density of composites with the addition of BT. Measurements of the magnetic and ferroelectric hysteresis loops at room temperature indicate that the composites exhibit ferroelectricity and ferromagnetism simultaneously at room temperature. An increase of the electric polarization has been observed due to structural distortion arising with the addition of BT. The significant dependence of the dielectric constant on the magnetic field has been observed in the prepared composites. The highest value of the magneto-dielectric response (3.2%) has been observed for a 40 mol% addition of BT.

https://iopscience.iop.org/article/10.1088/0964-1726/23/10/105024/pdf

Effect of BaTiO 3 addition on structural, multiferroic and magneto-dielectric properties of 0.3CoFe 2 O 4 -0.7BiFeO 3 ceramics

A novel direct Z-scheme heterojunction BiFeO3/ZnFe2O4 photocatalyst for enhanced photocatalyst degradation activity under visible light irradiation

Present review emphatically introduces the synthesis, biocompatibility, and applications of silver nanoparticles (AgNPs), including their antibacterial, antimicrobial, and antifungal properties. A comprehensive discussion of various synthesis methods for AgNPs, with a particular focus on green chemistry mediated by plant extracts has been made. Recent research has revealed that the optical properties of AgNPs, including surface plasmon resonance (SPR), depend on the particle size, as well as the synthesis methods, preparation synthesis parameters, and used reducing agents. The significant emphasis on the use of synthesized AgNPs as antibacterial, antimicrobial, and antifungal agents in various applications has been reviewed. Furthermore, the application areas have been thoroughly examined, providing a detailed discussion of the underlying mechanisms, which aids in determining the optimal control parameters during the synthesis process of AgNPs. Furthermore, the challenges encountered while utilizing AgNPs and the corresponding advancements to overcome them have also been addressed. This review not only summarizes the achievements and current status of plant-mediated green synthesis of AgNPs but also explores the future prospects of these materials and technology in diverse areas, including bioactive applications. 

An overview of green synthesized silver nanoparticles towards bioactive antibacterial, antimicrobial and antifungal applications.

Magneto-electric coupling and improved dielectric constant of BaTiO3 and Fe-rich (Co0.7Fe2.3O4) ferrite nano-composites

The mixed spinel-perovskite multiferroic composites of xNiFe2O4-(1 − x)BaTiO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) have been prepared by sol–gel method. The structure and morphology of the composites were examined by means of X-ray diffraction and transmission electron microscope. High-resolution transmission electron microscope image indicates a clear view of ferrite and ferroelectric phase. Moreover, we observed a fine interface between the two phases, where the coupling effect of ferrite and ferroelectric phase happened. The composites show excellent ferromagnetic and ferroelectric properties. The saturation magnetization (Ms) reaches to 24.139 emu/g for x = 0.6 at room temperature, the magnetization is about 2.37 emu/g for x = 0.6 when the temperature decreases to 90 k, and the polarization reaches to 3.75 μC/cm2 for x = 0.1. Frequency dependent variations of dielectric constant and loss tangent for xNiFe2O4-(1 − x)BaTiO3 were studied in detail.

A study of structural, ferroelectric, ferromagnetic, dielectric properties of NiFe2O4–BaTiO3 multiferroic composites

Synthesis, structure, and magnetic studies on the CoFe2O4–BiFeO3 nanocomposite films with different number of CoFe2O4 layers

Influence of the thickness of BiFeO3 on the ferromagnet properties of layered multiferroic CoFe2O4–BiFeO3 films

The invention discloses a nano-level lubricating oil additive and application thereof In the additive, pure niobium powder and selenium powder serve as raw materials; a NbSe2 nano material is prepared by a solid phase reaction method through mixed ball-milling, tabletting and calcining processes, wherein NbSe2 has low evaporativity in vacuum and high heat resistance, and can serve as a vacuum lubricating and electric contact lubricating material; and the nano material serves as the lubricating oil additive and industrial lubricating oil with high stability, load resistance and repairability is obtained by performing ultrasonic dispersion on the nano material The additive can be applied to various kinds of industrial lubricating oil, has high using performance such as high temperature resistance and corrosion resistance, obviously reduces friction, lessens corrosion to machines, has in-situ dynamic protection and repair effects on equipment or parts without pollution, effectively prolongs the service life of the machines, the equipment or the parts, also has the advantages of a few new components of materials, simple preparation process, low cost, high yield and the like, is economic and practical and is suitable for popularization and application

Nano-level lubricating oil additive and application thereof

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A study of structural, ferroelectric, ferromagnetic, dielectric properties of NiFe2O4–BaTiO3 multiferroic composites

Synthesis, structure, and magnetic studies on the CoFe2O4–BiFeO3 nanocomposite films with different number of CoFe2O4 layers

Influence of the thickness of BiFeO3 on the ferromagnet properties of layered multiferroic CoFe2O4–BiFeO3 films

Nano-level lubricating oil additive and application thereof