Shiv Prakash Singh

Liaoning Academy of Materials · Herbert Gleiter International Institution

https://doi.org/10.52305/DIOG6506

https://doi.org/10.52305/DIOG6506

In this study, the alloying of immiscible elements, Fe and Cu, at the atomic level was studied using three-dimensional atom probe tomography (3D APT). The sample was prepared as nanoglass using the inert gas condensation technique with the thermal co-evaporation of Fe90Sc10 alloy and pure Cu. The final composition of the nanoglass was found to be F...

Quantum dots (QDs) have engrossed huge research interest over the last 10 years. QDs are within the range of a few nanometers (<10 nm), and to be part of photonic structures, they are usually entrenched in thin films or other micro- and nanostructures. After briefly reviewing the various fabrication methods of QDs, examples of results concerning th...

In this study, we have reported the luminescent property of 0, 0.05, 0.1, and 0.5 mol. % Eu2O3 doped in bulk MgAl2O4 spinel excited at 266 nm. The samples were prepared by slip-cast method and sintered at 1650 °C for 2 hours in the air. The sintered samples were subjected to hot isostatic pressing (HIP) in argon atmosphere to achieve theoretical de...

The United Nations has declared the year 2022 as an international year of glass (IYoG) to recognize the remarkable contributions of glass to society. Hence, it is an opportunity to evaluate the progress made by the glass community. Besides the IYoG celebration, a detailed survey on the present status of glass science in India is assessed here. The...

Editorial on the Research Topic, Nanostructured Glass: Properties and Applications. Nanotechnology is playing an important role in both fundamental science and advanced technology. It remains an interesting topic for researchers in different fields. However, most of the materials in use are in crystalline form. When the grain size of the bulk cryst...

Shaping transparent ceramics through slip casting on plaster of Paris (PoP) moulds offers improved transparency compared to compacted samples due to better homogeneity in colloidal processing. However, the contamination due to CaSO 4 originated from the PoP contact is a primary concern. Therefore, it demands the machining of several layers from the...

The metallic glasses are known as amorphous and metastable materials. These materials have superior mechanical properties over crystalline materials with the same chemistry. Continuous efforts were made to improve the properties of metallic glass. The severe plastic deformation (SPD) method is used to improve the ductility of the glass. SPD causes...

Shaping transparent ceramics through slip casting on plaster of Paris (PoP) moulds offers improved transparency compared to compacted samples due to better homogeneity in colloidal processing. However, the contamination due to CaSO4 originated from the PoP contact is a primary concern. Therefore, it demands the machining of several layers from the...

In the past few decades, glass ceramic (GC) has revolutionized the application of glass [...]

In this work, pre-synthesized fluorophlogopite mica (KMg3AlSi3O10F2) crystalline powder was added into potassium-magnesium boro-alumino-silicate (K2O–MgO–B2O3–Al2O3–SiO2) glass powder to synthesize glass-ceramic composite (GCC) sealant for solid oxide fuel cell (SOFC) application. The basic purpose was to report the influence of KMg3AlSi3O10F2 on m...

The properties of a material can be engineered by manipulating its atomic and chemical architecture. Nanoglasses which have been recently invented and comprise nanosized glassy particles separated by amorphous interfaces, have shown promising properties. A potential way to exploit the structural benefits of nanoglasses and of nanocrystalline materi...

The elastic moduli of the metallic nanoglasses Fe86Sc14, Fe90Sc10, Cu58Zr42, and Cu60Zr40 were determined by measuring their longitudinal and shear wave velocities together with their densities. The data were compared to the elastic moduli of the conventional melt-spun metallic glass counterparts of the same chemical composition. The elastic moduli...

Amorphous (a-) Fe90−xCoxSc10 alloys have been produced by rapid quenching from the melt. The Curie temperature, TC, was determined using both mean field theory and Landau’s theory of second-order phase transitions in zero and non-zero external fields. The dependence of TC on the atomic spacing can be explained by the empirical Bethe-Slater curve. T...

Lithium disilicate is a critical glass forming composition as it is the basis of some glass-ceramics and it is also a model glass for the study of homogeneous and heterogeneous crystal nucleation. Incorporation of nitrogen in this glass significantly changes its structure and affects different properties. In this paper, nitrided lithium disilicate...

Lithium silicates have been used as model glasses for scientific and technological studies of glass-ceramics because they easily crystallize in the interiors, even without the addition of any nucleating agent. On the other hand, partial replacement of oxygens with nitrogens affects most properties of oxide glasses, but its effect on the crystalliza...

This paper describes the preparation of a transparent glass-ceramic from the SiO2-K2O-ZnO-Al2O3-TiO2 system containing a single crystalline phase, gahnite (ZnAl2O4). TiO2 was used as a nucleating agent for the heat-induced precipitation of gahnite crystals of 5-10 nm. The evolution of the ZnAl2O4 spinel structure through the gradual formation of Al...

In this chapter, detailed studies of the in situ generated nanometals in antimony oxide and bismuth oxide glasses are described. Gold (Au), silver (Ag), and gold-silver (Au-Ag) core-shell nanoparticle (NP) containing plasmonic antimony oxide glass nanocomposites (NCs) are synthesized by a single-step method. Their applications to obtain enhanced do...

Glass has been an important material since the early stages of civilization. Glass–ceramics are polycrystalline materials obtained by controlled crystallization of certain glasses that contain one or more crystalline phases dispersed in a residual glass matrix. The distinct chemical nature of these phases and their nanostructures or microstructures...

Blue shifts of the surface plasmon resonance band of sub-10 nm gold in dichroic phosphate glass nanocomposites are observed with increase in both size of gold nanoparticles and refractive index of the medium, which are contrary to the common trends. These phenomena have been enlightened with the electrodynamics theories (Mie and Drude models) and h...

Dry autoclaving of the metal acetates under similar conditions resulted in various phases and morphologies of metal carbonates, oxycarbonates, and oxides. The acetates of calcium (Group IIA) gave 100 nm thick CaCO3 nanosheets, and 3d transition metals (Mn and Fe) gave MnCO3 microcubes and Fe3O4 tetragonal bipyramids. The lanthanides (La, Ce, and Pr...

The alteration of crystallization behavior, microstructure, and thermal properties of fluorophlogopite mica-containing glass–ceramics by nucleating agent is systematically studied. TiO2, TiO2 + ZrO2, and ZrO2 have been doped as the nucleating agents in the SiO2–MgO–Al2O3–B2O3–K2O–MgF2 (BMAPS) glass system and prepared by the melt-quench technique....

Glass of the composition 23B2O3-5ZnO-72Bi2O3-xCuO (where, x=0.0003, 0.0012 and 0.003 at%, in excess) were prepared by a melt-quench technique. The effects of the copper ions on the structural and optical properties of ZnO-Bi2O3-B2O3 glass matrix were analyzed using various spectroscopic techniques. The infrared spectra showed the presence of some b...

Glasses formed with heavy metal (atomic weight >100) oxides (HMO) have received significant attention because of their interesting physical and optical properties. In this perspective, bismuth (atomic weight = 209) oxide containing glasses is one of the most important members of this family. Bismuth oxide glasses are very useful for exploiting as l...

Bi2+-enhanced photoluminescence of Eu3+ doped Bi0-bismuth glass nanocomposites are demonstrated here. The generation of bismuth nanoparticles (NPs) and its typical surface plasmon resonance at 460 nm are controlled by the oxidative method instead of the conventional reduction technique during melt-quench processing. TEM images evidence the presence...

In this study, in situ control growth of bismuth nanoparticles (Bi0 NPs) was demonstrated in bismuth-based glass dielectrics under an electron beam (EB) irradiation at room temperature. The effects of EB irradiation were investigated in situ using transmission electron microscopy (TEM), selected-area electron diffraction and high-resolution transmi...

Here, we report for the first time the synthesis of bismuth-coated silver nanoparticles in dichroic bismuth glass nanocomposites by a novel and simple one-step melt quench technique without using any external reducing agent. The metallic silver nanoparticles (Ag NPs) were generated first, and subsequently, metallic bismuth was deposited on the Ag N...

Synthesis of a new series of lead free low softening point (<470 degrees C) high Bi2O3 (40-90 mol%) glasses in the K2O-B2O3-Bi2O3 system by the melt-quench technique has been demonstrated here. Their structural, optical, thermal, electrical and other physical properties have been evaluated by X-ray diffraction (XRD), transmission electron microscop...

Nano-sized calcium silicate powders were synthesized at room temperature by the new mechanochemical method using a high energy planetary ball mill. The formation of calcium silicate from its raw materials (calcium carbonate and de-hydrated silica gel) was monitored by the XRD analysis with progression of ball milling. It is observed that the syn-th...

In recent past research on nanometal-glass hybrid composites has been the centre of attention across the globe particularly in the area of nanoscience and for the future nanotechnology. In this review, with a short historical background, its preparation by various multi-step techniques, properties and applications are briefly described. In addition...

The co-effects of Al2O3-SiO2 filler to an extent of 25 wt.% on thermal (softening point and coefficient of thermal expansion) and dielectric constant of lead free BaO-ZnO-B2O3-SiO2-Li2O-Na2O (BZBSLN) glasses have been explored with a view to use as barrier ribs of plasma display panels (PDPs). The interaction of fillers with glass occurred during f...

The combined effects of TiO2 and SiO2 fillers on thermal and dielectric properties of new lead-free environmental friendly zinc bismuth borate, ZnO–Bi2O3–B2O3 (ZBIB) glass microcomposite dielectrics have been investigated from the viewpoint of application as rear glass dielectric layer of plasma display panels (PDPs). The interaction of fillers wit...

Electron paramagnetic resonance (EPR), transmission electron microscopy (TEM), optical absorption and photoluminescence (PL) spectroscopic measurements are performed on Mn2+ doped high bismuth containing zinc–bismuth–borate glasses. TEM images reveal homogeneously dispersed Bio nanoparticles (NPs) of spherical shape with size about 5nm. EPR spectra...

In a lead-free low temperature sinterable multicomponent barium zinc borate glass system, BaO-ZnO-B2O3-SiO2-Li2O-Na2O (BZBSLN), the influence of SiO2 (amorphous) and Al2O3 (crystalline, α-alumina) ceramic fillers on the softening point (Ts), glass transition temperature (Tg), coefficient of thermal expansion (CTE), and dielectric constant (εr) has...

Glasses containing heavy metal oxide of the composition (wt.%) 23B2O3–5ZnO–72Bi2O3–xFe2O3/CeO2 (0≤x≤0.0058at.% in excess) were prepared by melt quenching technique. The glass formation was confirmed by XRD. FTIR spectra exhibit characteristic absorption bands for B2O3 and Bi2O3 for their various structural units. The EPR spectra exhibit two resonan...

We demonstrate here a novel oxidative process to control the metallic bismuth (Bi°) nanoparticles (NPs) formation in bismuth glass nanocomposites by using KClO4 and KNO3 as oxidant instead of usual reducing technique. The formation of Bi° NPs has been monitored by its distinctive surface plasmon resonance (SPR) band at 460 nm in the UV–vis absorpti...

The effects of SiO2 (amorphous) and TiO2 (crystalline, rutile) fillers on softening point (T s), glass transition temperature (T g), coefficient of thermal expansion (CTE), and dielectric constant (ɛ) of zinc bismuth borate, ZnO-Bi2O3-B2O3 (ZBIB) glass microcomposites have been investigated with a view to its use as the white back (rear glass diele...