scholarly journals Synthesis and characterization of ceria doped zinc ferrite nanopowdered crystallites

2021 ◽  
Vol 2070 (1) ◽  
pp. 012094
Author(s):  
Narender Kumar ◽  
Sunil Rohilla ◽  
S.K. Gupta
Keyword(s):  
Lattice Constant ◽  
Zinc Ferrite ◽  
Structural Parameters ◽  
Covalent Bond ◽  
Treatment Method ◽  
X Ray Diffraction ◽  
Space Group ◽  
Direct Lattice ◽  
Cubic Structure ◽  
Co Precipitation

Abstract In this paper, we have reported the synthesis of fine crystallites of ceria doped zinc ferrite by co-precipitation and an open air heat treatment method. X-ray diffraction (XRD) gave the data for structural analysis. The XRD data were refined by Rietveld refinement using FullProf suite software. The evolution of the crystalline phases has been analyzed. The effect of precursor concentration is reflected in the resulting diffractogram. Structural characterization revealed the cubic structure of zinc ferrite with a space group of FD-3m(227) and the cubic structure of CeO with a space group of fm-3m(225). Structural parameters such as the lattice constant of the direct lattice, the lattice constant of the reciprocating lattice, lattice strain, covalent bond angle, dislocation density, crystallite size and Wyckoff positions were calculated.

X-ray powder diffraction data for ω and C2 phases of Al–Cu–Ir

2008 ◽  
Vol 23 (4) ◽  
pp. 356-359 ◽  
Author(s):  
B. Grushko ◽  
D. Pavlyuchkov
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Tetragonal Structure ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
Cubic Structure

Ternary Al–Cu–Ir phases, isostructural to the Al–Cu–Rh ω and C2 phases, were found to be around the Al70Cu20Ir10 and Al60Cu15Ir25 compositions, respectively. Using powder X-ray diffraction, the former was found to have a tetragonal structure (space group P4/mnc) with a=6.4142(9) Å and c=14.842(4) Å, and the latter has a cubic structure (space group Fm3) with a=15.3928(6) Å.

Epitaxial growth of BaO and SrO with new crystal structures using mass-separated low-energy O+ beams

1993 ◽  
Vol 8 (2) ◽  
pp. 321-323 ◽  
Author(s):  
Ryusuke Kita ◽  
Takashi Hase ◽  
Hiromi Takahashi ◽  
Kenichi Kawaguchi ◽  
Tadataka Morishita
Keyword(s):  
Lattice Constant ◽  
High Energy ◽  
Low Energy ◽  
Diffraction Reflection ◽  
High Energy Electron ◽  
Bulk Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Cubic Structure

The growth of BaO and SrO on SrTiO3(100) substrates using mass-separated low-energy (50 eV) O+ beams has been studied using x-ray diffraction, reflection high-energy electron diffraction, and high-resolution transmission electron microscopy. It was found that the BaO and SrO films have been epitaxially grown with new structures different from those of corresponding bulk crystals: The BaO films have a cubic structure with a lattice constant of 4.0 Å, and the SrO films have a tetragonal structure with a lattice constant of a = 3.7 Å parallel to the substrate and with c = 4.0 Å normal to the substrate.

scholarly journals Band Gap Tailoring, Size Modulation and Photoluminescence Properties of Mn/Cu doped ZnS Nanostructures

2021 ◽  
Author(s):  
P.J. Binu ◽  
S. Muthukumaran
Keyword(s):  
Energy Gap ◽  
Effective Control ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Cubic Structure ◽  
Diffraction Patterns ◽  
Co Precipitation ◽  
Band Gap Tailoring

Abstract ZnS, Mn added ZnS (Zn0.97Mn0.03S) and Mn, Cu dual doped ZnS (Zn0.95Mn0.03Cu0.02S) QDs have been prepared using co-precipitation technique. The influence of Mn and Cu addition on the morphology, structure and photoluminescence properties of Mn/Cu incorporated ZnS have been examined. Cubic structure of the synthesized samples was confirmed by X-ray diffraction patterns. The incorporation of Cu in Zn-Mn-S lattice not only decreased the particle/grain size and also generates more defect based luminescent activation centres. The reduced energy gap by Mn addition was explained by sp-d exchange interaction and the elevated energy gap in Cu, Mn dual doped ZnS was expalined by Burstein–Moss effect. The tuning phenomenon of size as well as the energy gap in ZnS by Mn/Cu addition promote these materials for nano-electronic applications. FTIR spectra confirmed the presence of Mn/Cr-Zn-S bondings. The substitution of Mn /Cu provides an effective control over tuning of different emission colours which signifies their applications like light emitting diodes.

SYNTHESIS AND CHARACTERIZATION OF ZINC FERRITE BY XRD, VSM AND ELECTRON SPIN RESONANCE TECHNIQUES

2012 ◽  
Vol 27 (04) ◽  
pp. 1250213 ◽  
Author(s):  
PRANABA K. NAYAK ◽  
R. JOTHIRAMALINGAM
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Zinc Ferrite ◽  
Spinel Phase ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Spin Resonance ◽  
Co Precipitation ◽  
Substantial Change

In this report, the synthesis of zinc ferrite ( ZnFe 2 O 4) by co-precipitation method has been presented along with its subsequent characterization by using X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and electron spin resonance (ESR) techniques. The obtained XRD results of as-synthesized sample indicates the cubic spinel phase formation, which was confirmed from the XRD data of the above calcined sample at 1000°C. By using VSM, a complex magnetic structure was observed with substantial change on calcined sample. The ESR result of zinc ferrite sample studied at room temperature was found to be significantly different from that of the low temperature results, especially after heat-treatment.

scholarly journals Zirconium tetrachloride revisited

2018 ◽  
Vol 74 (3) ◽  
pp. 307-311
Author(s):  
Rosendo Borjas Nevarez ◽  
Samundeeswari Mariappan Balasekaran ◽  
Eunja Kim ◽  
Philippe Weck ◽  
Frederic Poineau
Keyword(s):  
Phase Transformation ◽  
Single Crystal ◽  
Structural Parameters ◽  
X Ray Diffraction ◽  
Zirconium Tetrachloride ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Temperature Range ◽  
Crystallographic Study

Zirconium tetrachloride, ZrCl4, is a strategic material with wide-ranging applications. Until now, only one crystallographic study on ZrCl4has been reported [Krebs (1970).Z. Anorg. Allg. Chem.378, 263–272] and that was more than 40 years ago. The compound used for the previous determination was prepared from ZrO2and Cl2–CCl4, and single-crystal X-ray diffraction (SCXRD) studies on ZrCl4obtained from Zr metal have not yet been reported. In this context, we prepared ZrCl4from the reaction of Zr metal and Cl2gas in a sealed tube and investigated its structure at 100, 150, 200, 250, and 300 K. At 300 K, the SCXRD analysis indicates that ZrCl4crystallizes in the orthorhombic space groupPca21[a= 6.262 (9),b= 7.402 (11),c= 12.039 (17) Å, andV= 558.0 (14) Å3] and consists of infinite zigzag chains of edge-sharing ZrCl6octahedra. This chain motif is similar to that observed previously in ZrCl4, but the structural parameters and space group differ. In the temperature range 100–300 K, no phase transformation was identified, while elongation of intra-chain Zr...Zr [3.950 (1) Å at 100 K and 3.968 (5) Å at 300 K] and inter-chain Cl...Cl [3.630 (3) Å at 100 K and 3.687 (9) Å at 300 K] distances occurred.

scholarly journals Coprecipitation and Characterization of Na Substituted LiMn0.5Ni0.5O2 for Lithium ion Battery Cathodes

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Le Phan Cam Linh ◽  
Nguyen Van Ky ◽  
Pham Duy Long ◽  
Giang Hong Thai ◽  
Dang Thi Thanh Le ◽  
...  
Keyword(s):  
Lattice Constant ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Solid State Reaction Method ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Na Substitution ◽  
Co Precipitation

In this study, Li1-xNaxMn0.5Ni0.5O2 materials were successfully synthesized by co-precipitation following by solid state reaction method. X-ray powder diffraction analyses showed that the Li1-xNaxMn0.5Ni0.5O2 materials were single-phase and crystallized in a rhombohedral structure with a space group of R–3m at Na substitution concentrations of 0–20%. When increasing the concentration of Na substitution to 30%, diffraction peaks of Na2Mn3O7 as an impurity phase appeared in the X-ray diffraction pattern of the synthesized material. Rietveld refinements of the X-ray diffraction patterns revealed that the substitutions of Na for Li resulted in significant increments of the lattice constant c and slight increments of the lattice constant a. The results of galvanostatic charge/discharge measurements showed that the substitutions reduced the specific capacity but improved the rate capability of the Li0.8Na0.2Mn0.5Ni0.5O2 in comparison with the LiMn0.5Ni0.5O2 material.

scholarly journals Crystal structures and comparisons of huntite aluminum borates REAl3(BO3)4 (RE = Tb, Dy and Ho)

2020 ◽  
Vol 76 (3) ◽  
pp. 339-343 ◽  
Author(s):  
Saehwa Chong ◽  
Brian J. Riley ◽  
Zayne J. Nelson ◽  
Samuel N. Perry
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Structural Parameters ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Slow Cooling ◽  
Spontaneous Crystallization ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters

Three huntite-type aluminoborates of stoichiometry REAl3(BO3)4 (RE = Tb, Dy and Ho), namely, terbium/dysprosium/holmium trialuminium tetrakis(borate), were synthesized by slow cooling within a K2Mo3O10 flux with spontaneous crystallization. The crystal structures were determined using single-crystal X-ray diffraction (SC-XRD) data. The synthesized borates are isostructural to the huntite [CaMg3(CO3)4] structure and crystallized within the trigonal R32 space group. The structural parameters were compared to literature data of other huntite REAl3(BO3)4 crystals within the R32 space group. All three borates fit well into the trends calculated from the literature data. The unit-cell parameters and volumes increase linearly with larger RE cations whereas the densities decrease. All of the crystals studied were refined as inversion twins.

scholarly journals Synthesis and characterization of NiFe2O4/ZnO core-shell nanocomposites

2018 ◽  
Vol 34 (4) ◽  
Author(s):  
Nguyen Duong
Keyword(s):  
Sodium Citrate ◽  
Structural Parameters ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Sem Images ◽  
The Core ◽  
Nife2o4 Nanoparticles ◽  
Co Precipitation

NiFe2O4/ZnO core-shell nanocomposites were prepared by two-step methodology. First, NiFe2O4 nanoparticles as the cores were synthesized by using hydrothermal method, and then modified by sodium citrate. After that ZnO as the shell was coated on modified NiFe2O4 nanoparticles by two different chemical methods including hydrothermal and co-precipitation. The formation, crystal structure, morphology and magnetic properties of the uncoated and coated samples were investigated by using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and vibrating sample magnetometer. It was shown that the core nanoparticles are single phase of NiFe2O4 with cubic spinel structure. Sodium citrate was well bonded on the surface of the modified nanoparticles. Contributions of the phases in the coated samples as well as structural parameters were determined from XRD data on applying of Rietveld refinement analysis. Magnetization of the core can be improved by adjusting the modification steps. XRD analysis result and SEM images revealed the formation of core/shell structure in the sample coated by using co-precipitation method.

Synthesis and Structures of Bis- and Tris-(triphenylarsine)gold(I) Iodides

2020 ◽  
Vol 73 (6) ◽  
pp. 497
Author(s):  
Graham A. Bowmaker ◽  
Peter C. Healy ◽  
Alexandre N. Sobolev ◽  
Allan H. White
Keyword(s):  
Crystalline Phase ◽  
Structural Parameters ◽  
X Ray Diffraction ◽  
Coinage Metal ◽  
Coordination Environment ◽  
Space Group ◽  
X Ray ◽  
Triclinic Phase ◽  
Yield Trends ◽  
Metal Ligand

The title compounds [(Ph3As)2AuI] and [(Ph3As)3AuI] have been crystallized from equimolar solutions of Bu4NAuI2 and AsPh3 in dimethylformamide and structurally characterized by single crystal X-ray diffraction studies. [(Ph3As)2AuI] crystallizes in space group C2/c, Z 4, and is isomorphous with other [(Ph3E)2MX] (MX=coinage metal(i) salt) arrays, with the Au–I bond being disposed on a crystallographic 2-axis: Au–I, As 2.7008(2), 2.4337(2) Å, As–Au–As, I 125.736(8)°, 117.132(4)° (153K). [(Ph3As)3AuI] crystallizes as a triclinic phase in space group , Z 4, and is isomorphous with [(Ph3Sb)3CuI] and [(Ph3P)3AgI]: Au–As 2.4847–2.5049(10), Au–I 2.8518(8), 2.8597(7) Å with As–Au–As, I 109.67(3)–115.97(3)°, 101.33(2)–106.85(3)°. A second ‘[(Ph3As)3AuI]’ product was obtained as a co-crystalline phase in space group P21/n containing [(Ph3As)3AuI], and [(Ph3As)2AuI] accompanied by an additional unbound Ph3As molecule, i.e. [(Ph3As)3AuI]·[(Ph3As)2AuI·Ph3As], with structural parameters closely similar to those for the corresponding separate [(Ph3As)3AuI] and [(Ph3As)2AuI] complexes described above. Comparison of the bond lengths for these and related complexes show that they are generally consistent with the ‘gold is smaller than silver’ phenomenon caused by relativistic orbital contraction effects in gold, but the results also show that the magnitude of this effect is dependent on the nature of the metal–ligand bonds involved, and on changes in the metal coordination environment, which can in some circumstances yield trends in which the effect on particular bonds is partially masked or even reversed.

Preparation of Magnetic Zinc Ferrite Nanoparticles and their Photocatalytic Performance

2017 ◽  
Vol 757 ◽  
pp. 125-130 ◽  
Author(s):  
Chutamanut Wongyara ◽  
Preeyaporn Harnkar ◽  
Cheewita Suwanchawalit ◽  
Tarawipa Puangpetch ◽  
Kritapas Laohhasurayotin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Zinc Ferrite ◽  
Diffuse Reflectance Spectroscopy ◽  
Visible Region ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
High Concentrations ◽  
Co Precipitation

Zinc ferrites (ZnFe2O4) nanoparticles were successfully prepared by the simple co-precipitation method. The effects of calcination temperature and the amount of surfactant on the microstructure of zinc ferrite products were studied. The products were characterized with X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and UV-Vis diffuse reflectance spectroscopy (DRS). The XRD results confirmed the formation of a cubic spinel structure in all samples. The SEM results revealed that surfactant molecules play a crucial role to control the microstructure of the samples. All samples showed extended absorptions in the visible region. The photocatalytic results indicated that ZnFe2O4 enhanced the photocatalytic activity with increased calcination temperature. In addition, the ZnFe2O4 prepared by addition of high concentrations of surfactant gave the highest photocatalytic activity. The synthesized ZnFe2O4 can be recovered by applying an external magnetic field.

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