scholarly journals Solid-phase synthesis of ytterbium zirconate using mechanical activation

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 154-158
Author(s):  
O. A Kuzmenkov ◽  
◽  
A. M. Kalinkin ◽  
Keyword(s):  
Mechanical Activation ◽  
Solid Phase ◽  
Planetary Mill ◽  
Phase Method ◽  
Stoichiometric Mixture ◽  
Phase Synthesis ◽  
X Ray ◽  
Zirconium Oxides ◽  
Solid Phase Method ◽  
Complex Thermal Analysis

Nanocrystalline ytterbium zirconate Yb4Zr3O12 was prepared by the solid-phase method using mechanical activation of stoichiometric mixture of zirconium and ytterbium oxides. Mechanical activation was carried out in an AGO-2 centrifugal-planetary mill at a centrifugal factor of 40 g for 10 min. The processes occurring during the calcination of the mechanically activated mixture of ytterbium and zirconium oxides in the range from 600 to 1300 °C were investigated using X-ray phase analysis, IR spectroscopy, and complex thermal analysis.

scholarly journals Enhanced Electrochemical Performances of Cobalt-Doped Li2MoO3 Cathode Materials

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 843 ◽  
Author(s):  
Zhiyong Yu ◽  
Jishen Hao ◽  
Wenji Li ◽  
Hanxing Liu
Keyword(s):  
Cathode Materials ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Phase Method ◽  
Electrochemical Performances ◽  
X Ray ◽  
Electrochemical Tests ◽  
Co Doping ◽  
Solid Phase Method ◽  
Better Than

Co-doped Li2MoO3 was successfully synthesized via a solid phase method. The impacts of Co-doping on Li2MoO3 have been analyzed by X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) measurements. The results show that an appropriate amount of Co ions can be introduced into the Li2MoO3 lattices, and they can reduce the particle sizes of the cathode materials. Electrochemical tests reveal that Co-doping can significantly improve the electrochemical performances of the Li2MoO3 materials. Li2Mo0.90Co0.10O3 presents a first-discharge capacity of 220 mAh·g−1, with a capacity retention of 63.6% after 50 cycles at 5 mA·g−1, which is much better than the pristine samples (181 mAh·g−1, 47.5%). The enhanced electrochemical performances could be due to the enhancement of the structural stability, and the reduction in impedance, due to the Co-doping.

Lignin-assisted solid-phase synthesis of nano-CuO for a photocatalyst with excellent catalytic activity and high performance supercapacitor electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65644-65653 ◽  
Author(s):  
Xiaohong Wang ◽  
Fangsheng Wu ◽  
Yawei Duan ◽  
Yingying Wang ◽  
Chen Hao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Phase Method ◽  
Phase Synthesis ◽  
Solid Phase Method

CuO nanostructures were successfully synthesized using NaOH and Cu(NO3)2 as starting materials by an aminated lignin (AL)-assisted solid-phase method.

scholarly journals Structural properties of TiO2-SnO2 thin films prepared by new pyrolysis solid-phase method

2021 ◽  
Vol 2086 (1) ◽  
pp. 012042
Author(s):  
M G Volkova ◽  
V Yu Storozhenko ◽  
V V Petrov ◽  
E M Bayan
Keyword(s):  
Solid Phase ◽  
Sem Analysis ◽  
Phase Method ◽  
Materials Properties ◽  
X Ray ◽  
Synthesis Parameters ◽  
Solid Phase Method ◽  
Sno2 Thin Films ◽  
Low Temperature Pyrolysis ◽  
Synthesized Materials

Abstract Nanoscale TiO2-SnO2 films with the Ti:Sn ratio 1:99, 3:97 and 5:95 mol%, respectively, were obtained by solid-phase low-temperature pyrolysis method. The synthesized materials were studied by X-ray phase analysis and scanning electron microscopy (SEM) analysis. Regardless of the modified agents’ concentration, the structure of cassiterite was observed for all synthesized materials. When studying the effect of synthesis parameters on the materials properties, it was shown that both an increase in the Ti4+ concentration and in the calcination temperature leads to an increase in the particle size.

Solubility of Mn in ZnO Crystallites Synthesized Using Solid State Techniques

2020 ◽  
Vol 3 (1) ◽  
pp. 28-39
Author(s):  
Esau Nii Abekah Akwetey Armah ◽  
Martin Egblewogbe ◽  
Hubert Azoda Koffi ◽  
Alfred Ato Yankson ◽  
Francis Kofi Ampong ◽  
...  
Keyword(s):  
Solid Phase ◽  
Solubility Limit ◽  
Phase Method ◽  
Regular Pattern ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Samples ◽  
Solid Phase Method ◽  
Mn Concentration

Powder samples of Zn1-xMnxO nanocrystal were synthesized at a temperature of 200 °C using solid phase method. Dopant concentrations of 0.005 ≤ x ≤ 0.5 were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view of determining the onset of secondary phases, hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at 200 °C is realized at x < 0.3. With a regular pattern in increment of the Mn concentration, there were variations observed in the trend of the relative intensity, 2θ position and d-spacing indicating uneven addition of Mn (thus Mn2+, Mn3+ or Mn4+).

scholarly journals Luminescence Performance of Yellow Phosphor SrxBa1−xTiO3: Eu3+, Gd3+for Blue Chip

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Limin Dong ◽  
Jian Li ◽  
Qin Li ◽  
Lianwei Shan ◽  
Zhidong Han
Keyword(s):  
Light Emission ◽  
Solid Phase ◽  
Phase Method ◽  
Photoluminescence Excitation ◽  
X Ray Diffraction ◽  
Yellow Light ◽  
X Ray ◽  
Potential Applications ◽  
Solid Phase Method ◽  
Luminescence Performance

The SrxBa1−xTiO3: Eu3+, Gd3+phosphors are synthesized by high temperature solid-phase method. Multiple techniques including X-ray diffraction (XRD), and scanning electron microscopy (SEM) are used to examine the surface morphology and structural properties of SrxBa1−xTiO3: Eu3+, Gd3+phosphors. The optical properties are presented and discussed in terms of photoluminescence (PL) and photoluminescence excitation (PLE) spectra. The as-obtained SrxBa1−xTiO3: Eu3+, Gd3+phosphors show higher PL emission intensity (at 591, 611 nm). The peaks at 591 and 611 nm are attributed to Eu3+  5D0-7F1,5D0-7F2. Gd3+has a strong sensitization on Eu3+. A certain amount of Sr2+and Ba2+is contributed to the intensity of light emission. After being irradiated with blue light, the phosphor samples emit yellow light. This suggests its potential applications in many fields.

Solid-phase synthesis of peptide selenoesters via a side-chain anchoring strategy

2017 ◽  
Vol 53 (39) ◽  
pp. 5424-5427 ◽  
Author(s):  
Cameron C. Hanna ◽  
Sameer S. Kulkarni ◽  
Emma E. Watson ◽  
Bhavesh Premdjee ◽  
Richard J. Payne
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Side Chain ◽  
Phase Method ◽  
Phase Synthesis ◽  
Solid Phase Method

A robust, high yielding and epimerisation-free solid-phase method for accessing peptide selenoesters is reported.

scholarly journals Magnetic Behavior and Nexafs-spectroscopy of Bi₂BaNb₂₋₂ₓСo₂ₓO₉₋δ

2019 ◽  
pp. 687-693 ◽  
Author(s):  
Lubov V. Rychkova ◽  
Sergey V. Nekipelov ◽  
Boris A. Makeev ◽  
Vladimir A. Belyy ◽  
Dmitriy S. Beznosikov ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Solid Solutions ◽  
Electron State ◽  
Solid Phase ◽  
Exchange Interactions ◽  
Magnetic Behavior ◽  
Phase Method ◽  
X Ray ◽  
Nexafs Spectroscopy ◽  
Solid Phase Method

The samples of solid solutions of Bi₂BaNb₂₋₂ₓСo₂ₓO₉₋δ composition at x 0:04 were synthesized by the solid-phase method. The electron state and the nature of the exchange interactions of cobalt atoms in the samples were studied by the measurements of magnetic susceptibility and NEXAFS-spectroscopy. The NEXAFS spectra of the solid solutions and the cobalt oxides CoO, Co3O4 were recorded. According to the data of X-ray spectroscopy and magnetic susceptibility, the charge states of cobalt atoms in the solid solutions were identified as Co(II) and Co(III) in the forms of monomers and exchange-bound aggregates with the antiferromagnetic type of exchange.

scholarly journals Using of mechanoactivation for preparation of cerium-containing solid solutions based on zircon

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 66-71
Author(s):  
V. Yu. Vinogradov ◽  
◽  
A. M. Kalinkin ◽  
V. Ya. Kuznetsov ◽  
◽  
...  
Keyword(s):  
Solid Solutions ◽  
Zirconium Oxide ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Planetary Mill ◽  
Molar Ratio ◽  
Phase Synthesis ◽  
X Ray ◽  
Cerium Content ◽  
Zircon Structure

Solid-phase synthesis of cerium-containing solid solutions based on ZrSiO4 was described. The synthesis was carried out using mechanical activation of a mixture consisting of zirconium oxide and hydrated amorphous silica with the addition of cerium oxide at a molar ratio of ZrО2:SiО2:CeО2 equal to 0.95:1.00:0.05. The mechanically activated in a centrifugal planetary mill mixture of reagents was calcined in the temperature range of 1200–1600 °C for 3 hours, which was accompanied by the essentially complete synthesis of zircon. The cerium content in the zircon structure was calculated from X-ray powder diffraction data.

X-Ray and Thermogravimetric Analyzes of Mechanically Activated Nickel Ferrites

2019 ◽  
Vol 970 ◽  
pp. 17-23
Author(s):  
Alexandr Astafyev ◽  
Evgeniy Nikolaev ◽  
Elena Lysenko ◽  
Anatoly P. Surzhikov
Keyword(s):  
Mechanical Activation ◽  
Phase Analysis ◽  
Nickel Ferrite ◽  
Solid Phase ◽  
Initial Mixture ◽  
Thermal Gravimetric ◽  
Phase Synthesis ◽  
X Ray ◽  
Activation Rate ◽  
Applied External Magnetic Field

This article shows a study of the effect of mechanical activation of the initial mixture of reagents NiO and Fe2O3 at different speeds of grinding bowl rotation on synthesis of nickel ferrite. Nickel ferrite was produced by the solid-phase synthesis at a temperature of 900 °C for 240 minutes. The obtained ferrite samples were investigated by thermal gravimetric and X-ray phase analysis. The Curie temperature values are obtained, as well as the magnitude of the change of detected instrument weight at the magnetic phase transition (ferromagnetic-paramagnetic) of nickel ferrite using thermal gravimetric curves (TG/DTG) with applied external magnetic field. Increasing of the homogeneity degree of ferrite materials with an increase in the mechanical activation rate is shown based on the data of X-ray phase analysis. The experimental results obtained from thermal, magnetic, and X-ray analyzes were compared.

scholarly journals Facile Synthesis of Mn0.68Bi0.32OCl Mix-Crystals And Its Supercapacitive Behavior

2021 ◽  
Author(s):  
Y.Z. Song ◽  
B.X. Qi ◽  
M.T. Li ◽  
J.M. Xie
Keyword(s):  
Surface Area ◽  
Solid Phase ◽  
Life Time ◽  
Molar Ratio ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Solid Phase Method

Abstract Mn0.68Bi0.32OCl mix-crystals for supercapacitor were successfully synthesized via a facile solid-phase method using Bi(NO3)3 and MnCl2 with molar ratio of 1:1 as precursors. The Mn0.68Bi0.32OCl mix-crystals were characterized by scanning electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller surface area measurements and thermogravimetry and differential scanning calorimetry, respectively. Cyclic voltammetry and galvanostatic charge/discharge technique were performed for the Mn0.68Bi0.32OCl mix-crystals in 1 M Na2SO4 aqueous solutions; the specific capacitance of Mn0.68Bi0.32OCl was about 203 F.g-1 at the current density of 3 A. g-1 with a long life time, owing to the high power density of Mn0.68Bi0.32OCl mix-crystals and the higher surface area, good conductivity, and high stability of the Mn0.68Bi0.32OCl mix-crystals.

Sign in / Sign up

Export Citation Format

Share Document