scholarly journals Rapid processing of ferrite ceramics with promising magneto-dielectric characteristics

2017 ◽  
Vol 07 (06) ◽  
pp. 1750040 ◽  
Author(s):  
Zhuohao Xiao ◽  
Chuanhu Wang ◽  
Lie Liu ◽  
Zhihong Yang ◽  
Ling Bing Kong
Keyword(s):  
Single Phase ◽  
Ceramic Materials ◽  
X Ray Diffraction ◽  
Time Duration ◽  
Dielectric Characteristics ◽  
Sintering Aid ◽  
X Ray ◽  
Sintering Time ◽  
One Step ◽  
Rapid Processing

Ferrite ceramics, Ni[Formula: see text]Zn[Formula: see text]Co[Formula: see text]Fe[Formula: see text]O4, with the addition of 4[Formula: see text]wt.% Bi2O3 as sintering aid, were fabricated by using a simple one-step processing without involving the step of calcination. X-ray diffraction (XRD) results indicated that single phase ferrite ceramics can be achieved after sintering at 1000[Formula: see text]C for 2[Formula: see text]h. The samples demonstrated relative densities in the range of 97–99%. Desired magneto-dielectric properties have been approached by adjusting the sintering temperature and sintering time duration. This technique is believed to be applicable to other ceramic materials.

Unveiling the Magnesium Storage Mechanisms of Co-Sputtered Indium-Tin Alloy Films Using Operando X-ray Diffraction

2021 ◽  
Author(s):  
Wenrun Cui ◽  
Meijia Song ◽  
Guixing Jia ◽  
Yu Wang ◽  
Wanfeng Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Single Phase ◽  
Clear Understanding ◽  
X Ray Diffraction ◽  
Alloy Films ◽  
X Ray ◽  
Electrochemical Reactivity ◽  
One Step ◽  
Magnesium Ion Batteries ◽  
Pure Sn

Abstract Tin (Sn)-based anodes have drawn extensive attention for magnesium ion batteries (MIBs) owing to their low reaction potentials, high theoretical capacities, and compatibility with conventional electrolytes. However, their poor electrochemical reactivity, sluggish kinetics, and large volume changes have obstructed progresses. Additionally, a clear understanding of the Mg storage chemistry is crucial for the development of high-performance MIBs. Here, we prepared self-supporting In-Sn alloy films with different compositions and phase constitutions via a one-step magnetron co-sputtering. As benchmarked with pure Sn film, the single-phase and biphase In-Sn alloy films effectively trigger the alloying reaction of Sn with Mg and further increasing of In significantly improves the electrochemical reactivity of the In-Sn electrodes. More importantly, operando X-ray diffraction was performed to unveil the magnesiation/demagnesiation mechanisms of the In0.2Sn0.8, In0.2Sn0.8/In3Sn and In3Sn electrodes, showing that In0.2Sn0.8 and In3Sn display different Mg storage mechanisms when existing alone or biphase coexisting. Our findings highlight the significance of the electrode design and mechanism investigations for MIBs.

Sintering AlN Ceramics Below 1500°C with MgO-CaO-Al2O3-SiO2 Glass Addition

2007 ◽  
Vol 336-338 ◽  
pp. 1868-1871 ◽  
Author(s):  
Cheng Fu Yang ◽  
Chien Min Cheng ◽  
Ho Hua Chung ◽  
Chao Chin Chan
Keyword(s):  
Sintering Temperature ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Dielectric Characteristics ◽  
Sintering Aid ◽  
Glass Addition ◽  
X Ray ◽  
Crystal Phases ◽  
Diffraction Patterns ◽  
Scanning Electron

5~15 wt% MgO-CaO-Al2O3-SiO2 (MCAS, fabricated by sol-gel method) glass is used as the sintering aid of AlN ceramics. The sintering is proceeded from 1350oC~1550oC, scanning electron microscope is used to observe the sintered morphologies and X-ray diffraction pattern are used to confirm the crystal structures. From the SEM observations, as 10wt% and 15wt% MCAS is added, AlN ceramics can be densified at 1500oC and 1450oC, which are much lower than the before studies were. From the X-ray diffraction patterns, the crystal phases of MCAS-AlN ceramics are AlN, Al2O3, and cordierite phases. In this study, the dielectric characteristics of MCAS-AlN ceramics are also developed as a function of MCAS content and sintering temperature.

Study Behavior of XPS Spectra of Ni, Mn, Y and O in Y2NiMnO6 Ceramics

2015 ◽  
Vol 804 ◽  
pp. 97-103 ◽  
Author(s):  
Panakamon Deeyai ◽  
Thanapong Sareein ◽  
Bundit Putasaeng ◽  
Naphat Chathirat
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ceramic Materials ◽  
Effect Of Temperature ◽  
Decomposition Technique ◽  
X Ray Diffraction ◽  
Xps Spectra ◽  
X Ray ◽  
Study Behavior ◽  
Sintering Time ◽  
Effects Of Temperature

Bulk Y2NiMnO6 samples were prepared by thermal decomposition technique at 800 °C for 6 hours. The effects of temperature on the structure of ceramics were investigated for different sintering temperatures in the range of 1000-1300 °C, while kept constant the sintering time of 12 hours. Structural characterization had been investigated via X-ray diffraction (XRD) on samples of different sintering temperatures. Results from the experiment had revealed that high temperature affected oxide in ceramic materials. Further analysis with X-ray photoelectron spectroscopy (XPS) technique had revealed an outstanding point of ceramics by investigating the Ni 2p, 2p3/2, Mn 2p1/2, 2p3/2, and Y 3d3/2, 3d5/2 at the surface of Y2NiMnO6 ceramics. The changes in relative intensity of XPS peaks and the shifts in their binding energy (eV) were observed in the results, while the effect of temperature on oxide in ceramics may be investigated with dielectric property in the future.

Temperature and time dependence of phase formation of HgBa2Can−1CunO2(n+1)+δ superconductors

1999 ◽  
Vol 14 (3) ◽  
pp. 644-651 ◽  
Author(s):  
Ayako Yamamoto ◽  
Makoto Itoh ◽  
Atsushi Fukuoka ◽  
Seiji Adachi ◽  
Hisao Yamauchi ◽  
...  
Keyword(s):  
Time Dependence ◽  
Phase Formation ◽  
Wide Temperature Range ◽  
Single Phase ◽  
Xrd Analysis ◽  
Single Step ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Time ◽  
Firing Method

We systematically studied the temperature and time dependence of phase formation of HgBa2Can−1CunO2(n+1)+δ [Hg-12(n − 1)n, n = 1, 2, 3, 4] superconductors by a single step firing method. All samples were synthesized from high-purity HgO, BaO, CaO, and CuO in a sealed quartz tube. The phase formation of Hg-12(n − 1)n was examined by both x-ray diffraction (XRD) analysis and dc susceptibility measurement. A single-phase HgBa2CuO4+δ (Hg-1201) was obtained in a relatively wide temperature range (600–850 °C), while single-phase HgBa2CaCu2O6+8 (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) were obtained only in narrow temperature and time ranges for the synthesis. The optimum temperatures for Hg-1212 and Hg-1223 were found to be 665 and 710 °C, respectively, when the sintering time was fixed for about 50 h. The HgBa2Ca3Cu4O10+δ (Hg-1234) phase was obtained as a mixture with Hg-1223.

scholarly journals Entropy-Stabilized Oxides owning Fluorite Structure obtained by Hydrothermal Treatment

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 558 ◽  
Author(s):  
Luca Spiridigliozzi ◽  
Claudio Ferone ◽  
Raffaele Cioffi ◽  
Grazia Accardo ◽  
Domenico Frattini ◽  
...  
Keyword(s):  
Single Phase ◽  
Configurational Entropy ◽  
Ceramic Materials ◽  
Fluorite Structure ◽  
X Ray Diffraction ◽  
State Transformation ◽  
Solid State Transformation ◽  
X Ray ◽  
Phase Stabilization ◽  
Single Phase State

Entropy-Stabilized Oxides (ESO) is a modern class of multicomponent advanced ceramic materials with attractive functional properties. Through a five-component oxide formulation, the configurational entropy is used to drive the phase stabilization over a reversible solid-state transformation from a multiphase to a single-phase state. In this paper, a new transition metal/rare earth entropy-stabilized oxide, with composition Ce0.2Zr0.2Y0.2Gd0.2La0.2O2−δ, was found after several investigations on alternative candidate systems. X-Ray Diffraction (XRD) analyses of calcined powders pointed out different behavior as a function of the composition and a single-phase fluorite structure was obtained after a specific thermal treatment at 1500 °C. Powders presented the absence of agglomeration, so that the sintered specimen exhibited sufficient densification with a small porosity, uniformly distributed in the sample.

Hyperthermia Effect on Phantom of Breast Carcinoma Tissue Induced by Mn3O4 Nanoparticles Synthesized by One-Step Spray Pyrolysis Method

2020 ◽  
Vol 853 ◽  
pp. 56-60
Author(s):  
Alexa Gaona-Esquivel ◽  
Diana S. Hernández-Manzo ◽  
Perla J. Sánchez-Trujillo ◽  
Oscar E. Cigarroa-Mayorga ◽  
Miguel Meléndez-Lira
Keyword(s):  
Spray Pyrolysis ◽  
Single Phase ◽  
Average Diameter ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Manganese Oxide Nanoparticles ◽  
X Ray ◽  
Pyrolysis Method ◽  
One Step ◽  
Microscopy Images

In this work, the synthesis of manganese oxide nanoparticles was achieved by one-step spray pyrolysis method. The nanoparticles were synthesized just from MnCl2 aqueous solution. The solution was nebulized to a Si substrate placed at 400 °C for 1, 5 10 and 20 min and transported at a 0.1 L /min rate in a Nitrogen flux. The X-ray diffraction confirms tetragonal Mn3O4 as the unique phase in the whole sample. The scanning electron microscopy images proved the achievement of irregular nanoparticles with an average diameter of 280 nm experimentally determined by dynamic light scattering. Energy dispersive X-ray and Raman spectroscopy confirmed that the nanoparticles were obtained with Mn3O4 single-phase and the employed methodology prevented any contamination. The nanoparticles proved to induce temperature enhancement on artificial breast tissue by exposition to microwave radiation by achieving an increase in temperature around 8 %.

scholarly journals Fabrication of Cu1.5Mn1.5O4 Nanoparticles Using One Step Self-Assembling Route to Enhance Energy Consumption

2021 ◽  
Vol 11 (5) ◽  
pp. 2034
Author(s):  
Ghadah M. Al-Senani ◽  
Omar H. Abd-Elkader ◽  
Nasrallah M. Deraz
Keyword(s):  
Green Synthesis ◽  
Room Temperature ◽  
Single Phase ◽  
Magnetic Measurement ◽  
Brute Force ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
Self Assembling ◽  
One Step

The preparation of copper manganite (hopcalite, Cu1.5Mn1.5O4), as a single phase, was achieved by using a sustainable method of green synthesis. This method is based on the replacement of the conventional “brute force” ceramic preparation by the recent “soft force” green synthesis via the egg white assisted one-step method. In other words, we present a facile and rapid methodology to prepare the nanocrystalline Cu1.5Mn1.5O4 spinel as a single phase, compared to our previous work using ceramic and glycine-assisted combustion methods. The as-synthesized copper manganite was characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), energy-dispersive spectroscopy (EDS), and scanning electron microscope (SEM). We used a vibrating sample magnetometer to determine the magnetic properties of the prepared sample (VSM). XRD, FTIR, SEM, EDS and transmittance electron micrograph (TEM) resulted in synthesis of a successful cubic spinel Cu1.5Mn1.5O4 system with a sponge crystal structure. The particles of the prepared materials are polycrystalline in their nature and the sizes ranged between 50 and 100 nm. The magnetic measurement demonstrated that the generated nanostructure has been found to exhibit ferromagnetism at room temperature with an optimum saturation magnetization value (0.2944 emu/g).

Low Temperature Sintering (Ba1-xSrx)TiO3 Ceramics by Using CuO-TiO2 Mixture as Sintering Aid

2007 ◽  
Vol 336-338 ◽  
pp. 62-65 ◽  
Author(s):  
Chao Chin Chan ◽  
Chean Cheng Su ◽  
Chien Chen Diao ◽  
Cheng Fu Yang
Keyword(s):  
Grain Size ◽  
Diffraction Method ◽  
Liquid Phase Sintering ◽  
Molar Ratio ◽  
Low Temperature Sintering ◽  
X Ray Diffraction ◽  
Dielectric Characteristics ◽  
Sintering Aid ◽  
X Ray ◽  
Cubic Structure

1wt% CuO-TiO2 (molar ratio, CuO/TiO2= 1) mixture is added as the liquid phase sintering aid to develop the sintering and dielectric characteristics of (Ba1-xSrx)TiO3 (x=0, 0.1, and 0.2) ceramics. The crystal characteristics of calcined (Ba1-xSrx)TiO3 powders and sintered (Ba1-xSrx)TiO3 ceramics are developed by using X-ray diffraction method. The calcined (Ba1-xSrx)TiO3 powders and 1050oC-sintered (Ba1-xSrx)TiO3 ceramics reveal a tetragonal or pseudo-cubic structure and the 1150oC-sintered(Ba1-xSrx)TiO3 ceramics reveal a tetragonal structure. Sintered at 1100oC, the (Ba1-xSrx)TiO3 ceramics present a porous structure; Sintered at 1150oC, the (Ba1-xSrx)TiO3 ceramics present a uniform growth. The grain size decreases with the increase of SrO content. In this study, the dielectric characteristics of CuO-TiO2 mixture-fluxed (Ba1-xSrx)TiO3 ceramics are also developed.

Develop Single-Phase High Dielectric Constant SiO2-Based Composite Gate Dielectric

2010 ◽  
Vol 434-435 ◽  
pp. 259-262
Author(s):  
Chao Chin Chan ◽  
Yin Fang Wei ◽  
Chien Chen Diao ◽  
Yuan Tai Hsieh ◽  
Ping Shou Cheng
Keyword(s):  
Single Phase ◽  
High Dielectric Constant ◽  
Gate Dielectric ◽  
Raw Materials ◽  
Ceramic Materials ◽  
Dielectric Constants ◽  
Dielectric Characteristics ◽  
X Ray ◽  
High Dielectric ◽  
Ray Patterns

In this study, we hoped to find the single-phase high dielectric FET gate-used ceramic materials, which will be used in the sputtering method and have the dielectric constants higher than those of SiO2 and Si3N4. TiO2, La2O3 and ZrO2 are mixed with SiO2 to format the (1-x) TiO2-x SiO2, (1-x) ZrO2-x SiO2 and (1-x) La2O3-x SiO2 compositions, where x is dependent on the different raw materials. The all compositions are calcined at 1100oC and sintered at 1400oC~ 1550oC for 2hrs, and the X-ray patterns are used to find the crystal phases of all sintered ceramics. Because of the existence of single-phase, the sintering and dielectric characteristics of 0.3 La2O3-0.7 SiO2 ceramic are further developed.

Synthesis and Raman Spectra of Cupric Oxide Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
J.F. Xu ◽  
W. Ji ◽  
Z.X. Shen ◽  
S.H. Tang ◽  
X.R. Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raman Spectra ◽  
Single Phase ◽  
Cupric Oxide ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Peaks

ABSTRACTWe have synthesised CuO quantum dots by using a method of one-step solid state reaction under ambient conditions, and investigated them by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman scattering technique. The XRD shows that the sample is composed of single phase CuO with a monoclinic structure. The particle size estimated from the x-ray diffraction peaks is about 12 nm, consistent with the TEM result. The Raman spectra show that there are three Raman peaks at 282, 332 and 618 cm−1, which are much broader and shifted several cm−l to lower frequencies in comparison with those of bulk CuO crystal. The temperature dependence of the Raman spectra in the range 77–873 K is also presented.

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