Jiba Nath Dahal

Virginia Union University | VUU · Department of Natural Sciences

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM = Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated in this study. Rietveld analysis of X-ray data indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters a, c, and the unit cell...

This study investigated polyethylene glycol (PEG), as a polymer improver of the paraffinic oil viscosity index (VI). The characterization of PEG/paraffinic oil blends at different concentrations (0%, 1%, 2%, 3%, 5%, and 10%), was performed using Raman spectroscopy and optical microscopy. The rheological parameters as the viscosity index and activat...

Intermetallic compounds of Dy2Fe16Ga1􀀀xNbx (x = 0.0 to 1.00) were synthesized by arc melting. Samples were investigated for structural, magnetic, and hyperfine properties using X-ray diffraction, vibration sample magnetometer, and Mossbauer spectrometer, respectively. The Rietveld analysis of room temperature X-ray diffraction data shows that all t...

As a subfield of Artificial Intelligence (AI), Machine Learning (ML) aims to understand the structure of the data and fit it into models, which later can be used in unseen data to achieve the desired task. ML has been widely used in various sectors such as in Businesses, Medicine, Astrophysics, and many other scientific problems. Inspired by the su...

Paschen's law (PL), derived based on the Townsend avalanche (TA) condition, is commonly used to predict gas breakdown. For microscale gaps near atmospheric pressure, TA is insufficient to drive breakdown and ion-enhanced field emission (FE) dominates. Accurately predicting breakdown voltages for these gaps is critical for numerous applications, inc...

Sr1-yPryFe12-xCoxO19 (x= 0.0- 1.5 and y= 0.1- 0.3) polycrystalline samples were prepared via auto combustion method and analyzed with respect to their structural and magnetic characteristics. The possibility of simultaneous substitution of Fe3+ by Co2+ was verified for low substitution degrees. At higher substitution of Co2+, a secondary soft magne...

The effects of substitution of Zr and Ga on the structural and magnetic properties of Dy2Fe17 intermetallic compound were investigated in this study. The Rietveld analysis confirmed that the crystalline system was a Th2Ni17 structure. Lattice parameters a (Å) and c (Å), unit cell volume (Å3), and bonding distance (Å) were calculated using Rietveld...

In this article, the effect of substitution of Zr and Ga in Dy2Fe17 prepared by arc melting technique are studied. The substitution of Zr and Ga in Dy2Fe17 was found to have an important effect on their structure and magnetic properties. The Rietveld analysis conformed that the crystalline system wereTh2Ni17 structure. Lattice parameters a (Å) and...

Magnetic nanocomposite (hard) SrFe12O19-(soft) La(1-x) SrxMnO3 powders in 4:1 weight ratio was synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950°C. Structural and morphological characterizations were performed via x-ray diffraction (XRD) and transmission electron microscopy (TEM). Vibra...

Magnetically hard-soft (100-x) SrFe12O19–x wt % La0.7Sr0.3MnO3 nanocomposites were synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950 °C. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM) were used to characterize the structural and...

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM=Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated. Rietveld analysis of X-ray diffraction indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters: a, c and unit cell volume show T...

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM=Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated. Rietveld analysis of X-ray diffraction indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters: a, c and unit cell volume show T...

Traditional plasma systems typically operate at low pressures and centimeter scale reactors. However, during the last decade or so, there is an active interest in the downscaling of devices and plasmas are no exception. Because of the popular pd (pressure times gap size) scaling, such plasmas have to operate at or near atmospheric pressure and are...

Microplasmas have become an active area of research during the last two decades with several applications including nanomaterial synthesis, electronics, lighting, biomedicine, and metamaterials for controlling electromagnetic waves. The advances in micro/nanofabrication and the further miniaturization of plasma devices have contributed to the incre...

The Robust Heliotropic Servo Design for Concentrated Photovoltaic Systems, or HCPVS, is an advanced solar energy collector. The HCPVS implements a control system to move a solar cell to the focus point of the sun's concentrated rays. This enables a less expensive, lower footprint, lightweight, and highly efficient solar energy collection system com...

Binary rare-earth (R)-iron inter-metallic compounds with Th2Ni17 and Th2Zn17 structure have been extensively studied for potential application of these materials as permanent magnets. The main drawbacks of these materials are low Curie temperature (Tc) and magnetic anisotropies. In the recent years, many efforts have been made to solve these proble...

SrFe12-x-yAlxCoyO19 (x = 1.0–4.0, and y = 0.0–2.0) polycrystalline samples were prepared via autocombustion method and analyzed with respect to their structural and magnetic characteristics. The possibility of simultaneous substitution of Fe3+ by Al3+ and Co2+ was verified for low substitution degrees and it was established that single-phase Al3+-C...

Ferrite materials are of enormous technological importance, as these materials are used as recording media for hard disks, magnetic storage, microwave, sensing devices etc. In order to meet the current technological demands, further improvement in the magnetic properties of ferrites is essential. Improvement in magnetic and dielectric properties ha...