Influence of Sintering Temperature on the Structure of SrFeCoO3-δ Oxide

2012 ◽  
Vol 550-553 ◽  
pp. 2719-2722
Author(s):  
Su Qin Chen ◽  
Xiang Hong Huang
Keyword(s):  
Particle Size ◽  
Perovskite Structure ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Experimental Results ◽  
Citrate Method ◽  
Different Temperatures ◽  
Diffraction Peaks

SrFeCoO3-δ oxides have been synthesized by citrate method and the effect of sintering temperature on the structure of the samples has been analyzed. The experimental results show that the samples sintered at different temperatures are mainly composed of SrFe0.5Co0.5O3 with perovskite structure. The impure phases decrease and the intensity of the diffraction peaks of the SrFe0.5Co0.5O3 perovskite phase increases with the increase of the sintering temperature. High pure SrFe0.5Co0.5O3 perovskite phase can be obtained after sintering at 1000°C and 1100°C. The particle size with irregular morphology increases with the increase of the sintering temperature.

Effects of Micropores on Processing and Properties of Porous Irons

2017 ◽  
Vol 863 ◽  
pp. 26-32
Author(s):  
Ming Zhou Su ◽  
Hui Meng Wang ◽  
Chang Chen
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Corn Starch ◽  
Sintering Temperature ◽  
Starch Content ◽  
Volumetric Shrinkage ◽  
Small Particle Size ◽  
Compressive Properties ◽  
Different Temperatures ◽  
Powder Metallurgy Route

Porous irons with only micropores were produced through powder metallurgy route. Corn starch of small particle size (5-15μm) was utilized to regulate the densification of green compacts. The structural and mechanical properties of porous irons sintered at different temperatures were evaluated. The porosities increased with increasing the starch content, which reduced compressive strength and increased volumetric shrinkage. The compressive yield stress increased with increasing sintering temperature. It was also found that the effect of sintering temperature on the microstructure and compressive properties was more obvious when green compacts were less densified. Moreover, volumetric shrinkage of porous irons without adding starch remains in a quite low level for different sintering temperatures.

Effects of different sintering temperature on structural and magnetic properties of Ni–Cu–Co ferrite nanoparticles

2018 ◽  
Vol 32 (27) ◽  
pp. 1850321 ◽  
Author(s):  
Xiaoguang Pan ◽  
Aimin Sun ◽  
Yingqiang Han ◽  
Wei Zhang ◽  
Xiqian Zhao
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Spinel Structure ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Stable State ◽  
Precursor Solution ◽  
Auto Combustion ◽  
Different Temperatures ◽  
Ft Ir

In this work, sol–gel auto-combustion technology is used to synthesize nanocrystalline Ni[Formula: see text]Cu[Formula: see text]Co[Formula: see text]Fe2O4 with high purity metal nitrate and citric acid as precursor solution. The prepared samples are sintered at different temperatures (400[Formula: see text]C, 500[Formula: see text]C, 600[Formula: see text]C, 700[Formula: see text]C, 800[Formula: see text]C, 900[Formula: see text]C, 1000[Formula: see text]C and 1100[Formula: see text]C) for 3.5 h. The structure and magnetic properties of the samples are characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and vibrating sample magnetometer (VSM). The analysis of the XRD patterns confirms that all the samples have a single-phase cubic spinel structure. The particle size of the prepared samples (between 23 nm and 36 nm) is determined by the Scherrer equation. The effect of particle size is through observation of samples sintered at different temperatures. FT-IR spectroscopy shows the characteristic peak is near 588 cm[Formula: see text]. And the measurement also confirms the formation of spinel structure. The magnetic parameters of the samples are measured by VSM at room temperature with a maximum magnetic field of 1 T. Coercivity, remanent magnetization and saturation magnetization change with the changing sintering temperature. It can be clearly observed that the magnetic properties increase significantly with the temperature increasing from 600[Formula: see text]C to 700[Formula: see text]C. The dM/dH versus H curves are obtained by differentiating the hysteresis loop. The increasing peak height of dM/dH at [Formula: see text], indicates a magnetically stable state for the samples with good crystalline cubic spinel structure.

Influence of Sintering Temperature on the Electrochemical Performance of Sm0.5-XGdxSr0.5Co 3-δ/Gd0.1Ce0.9O1.95 Composite Cathode

2011 ◽  
Vol 239-242 ◽  
pp. 1613-1616
Author(s):  
Ji Min Zhai ◽  
Xi Wen Song ◽  
Fen Zhou ◽  
Sheng Li An
Keyword(s):  
Solid State ◽  
Impedance Spectroscopy ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Solid State Reaction Method ◽  
Composite Cathode ◽  
Reaction Method ◽  
Composite Cathodes ◽  
Different Temperatures ◽  
Alternative Current

In this paper, Sm0.5-xGdxSr0.5CoO3-δ(SGSC, x=0 and 0.2) powders were prepared using the solid-state reaction method. Their structure was identified by XRD. All powders formed the perovskite phase when calcined at 1100°C for 5 h. Sm0.3Gd0.2Sr0.5CoO3-δ/Gd0.1Ce0.9O1.95slurrieswere screen printed onto both surfaces of Gd0.1Ce0.9O1.95electrolyte and fired at different temperatures to fabricate the composite cathodes. The electrochemical property of the composite cathodes was characterized by the alternative current impedance spectroscopy. The impedance resistance of the composite cathodes increased with the increase of sintering temperature. For instance, the impedance resistance of the composite cathode fired at 1000 °C was 0.0875 Ω·cm2at 700 °C, while it was 0.175 Ω·cm2when fired at 1100 °C.

Effect of Sintering Temperature and Particle Size on Porous SiC/Si3N4 Composite Ceramics

2011 ◽  
Vol 399-401 ◽  
pp. 449-452
Author(s):  
Shuo Wang ◽  
Jun Li ◽  
Wen Jie Yuan ◽  
Hong Xi Zhu ◽  
Cheng Ji Deng
Keyword(s):  
Mechanical Property ◽  
Particle Size ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Composite Ceramic ◽  
Composite Ceramics ◽  
Different Temperatures ◽  
Porous Sic ◽  
Microstructure And Mechanical Property ◽  
Compressive Tests

Porous SiC/Si3N4 composite ceramic was prepared at different temperatures by pressureless using SiC and Si3N4 as raw materials. The effects of sintering temperature and different particle size of SiC on porosity SiC/Si3N4 composite ceramic were investigated. The phases, microstructure and mechanical property were characterized by XRD, SEM, and compressive tests respectively. The results indicate that the increase of sintering temperature is in favor of the formation of β-Si3N4 crystal phase, the porosity and the compression strengthof porous SiC/Si3N4 composite ; The porosity of Si3N4/SiC block which contain particle graded higher than single particle size, but weaker compression strength.

Sintering and Dielectric Properties of Nano-BaTiO3 Powder Synthesized by High-Gravity Reactive Precipitation

2007 ◽  
Vol 280-283 ◽  
pp. 53-56
Author(s):  
Xiao Lin Liu ◽  
Jing Qiang Zhang ◽  
Jian Feng Chen ◽  
Li Jie Gao ◽  
Shao Qing Wang
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Property ◽  
Room Temperature ◽  
Experimental Results ◽  
High Gravity ◽  
Dry Pressing ◽  
Different Temperatures ◽  
The Mean

The dielectric properties and sintering activity of nano-BaTiO3 powders synthesized by HGRP method were investigated. The starting BaTiO3 powders were calcined at different temperatures from 700 to 900°C to improve their crystallinity and the mean particle size of BaTiO3 powders obtained increased from 40nm to 80nm. After being formed by conventional dry pressing the green bodies were sintered at 1100°C and 1200°C for 2hr in air. The effects of both calcinating and sintering temperatures on the sinterability, dielectric property and microstructure of BaTiO3 ceramics were discussed. The experimental results showed that the BaTiO3 powders have high sintering activity and the highest dielectric constant of this material at room temperature may reach 2880.

EFFECT OF PARTICLE SIZE ON THE PROPERTIES OF Mg–Mn FERRITES

2006 ◽  
Vol 20 (19) ◽  
pp. 1163-1171 ◽  
Author(s):  
M. SINGH
Keyword(s):  
Particle Size ◽  
High Performance ◽  
Magnetic Particles ◽  
Sintering Temperature ◽  
Initial Permeability ◽  
Ceramic Method ◽  
Citrate Method ◽  
Tremendous Importance ◽  
Effect Of Particle Size ◽  
Citrate Precursor

Processing of ferrites has gained tremendous importance in recent times in order to meet high performance demands on ferrites in keeping with the fast emerging technologies. The main focus of research in the 21st century is towards the formation of smaller magnetic particles. In normal ceramic methods we cannot control particle size and porosity, whereas in precursor methods we can control both. In the present study we have synthesized Mg 0.9 Mn 0.1 Fe 2 O 4 ferrites by the normal ceramic method and the citrate precursor method. By the citrate method we have simultaneously reduced the particle size and sintering temperature as compared to the normal ceramic method. By the citrate method, direct current (DC) resistivity is increased by two orders of magnitude, and electrical as well as magnetic losses are reduced as compared to the normal ceramic method. The initial permeability is reduced in both citrate method as compared to the normal ceramic methods. However, with sintering temperature the initial permeability increases. The dielectric constant is reduced by the citrate method as compared to normal ceramic methods. These observations are explained on the basis of various mechanisms and models.

Particle Size Dependent Structural and Magnetic Properties of CoCrFeO4 Nanoparticles

2012 ◽  
Vol 486 ◽  
pp. 129-133
Author(s):  
R. Mane Dhanraj ◽  
H. Kadam Ram ◽  
T. Alone Suresh ◽  
E. Shirsath Sagar
Keyword(s):  
Particle Size ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Combustion Method ◽  
Blocking Temperature ◽  
Particle Sizes ◽  
Particle Size Range ◽  
Size Dependent ◽  
Auto Combustion ◽  
Different Temperatures

Nanoparticles of CoCrFeO4ferrite in the particle size range of 9 - 38 nm have been prepared by a sol-gel auto combustion method. Synthesized powders were annealed at four different temperatures viz. 400 °C, 600 °C, 800 °C and 1000 °C. Particle sizes are determined by X-ray analysis and TEM. The size of the nanoparticles increase linearly with sintering temperature and time, most probably due to coalescence that increases as sintering temperature increases. The saturation magnetization increases from 62 to 81 emu/g and coercivity initially increases up to 814 Oe and then decreases to 366 Oe with increase in particle size and sintering temperature. The typical blocking temperature increases from 135 to 165 K with increasing particle size.

Effect of t-ZrO2 Content on Grinding Performance of Fused Zirconia Alumina Abrasive

2013 ◽  
Vol 873 ◽  
pp. 431-435
Author(s):  
Zhi Jie Liao ◽  
Mu Xiao ◽  
Hai Yan Wu ◽  
Feng Xia ◽  
Ying Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Sintering Temperature ◽  
Phase Identification ◽  
Size Change ◽  
X Ray ◽  
Grinding Performance ◽  
Different Temperatures ◽  
Shape And Size ◽  
Strength And Toughness

Fused zirconia alumina has been broadly applied in abrasive industry due to its excellent strength and toughness. The aim of the present work is to investigate the effect of t-ZrO2 content on grinding performance of fused zirconia alumina. Commercial fused alumina zirconia (ZA25) powder was used to fabricate the particle size of 380-830 μm abrasive samples for grinding experiment by pressure granulation and sintering at different temperatures. Phase identification of abrasives sintered at different temperatures was made by X-ray diffractometry and the correlations between t-ZrO2 content and grinding performance of abrasive were also tested. The results showed that t-ZrO2 content of abrasive decreased with sintering temperature increasing within a range of sintering temperatures from 1375 °C to 1450 °C. Grinding performance of abrasive was enhanced as increasing t-ZrO2 phase in abrasive. The better the toughness of abrasive powders, the less shape and size change of abrasive powders during grinding, this is the reason why the high t-ZrO2 phase contained fused zirconia alumina abrasive exhibit high grinding performance.

Effect of Sintering Temperature on the Oxygen Adsorption Property of Ba0.8Sr0.2Fe0.5Co0.5O3-δ

2013 ◽  
Vol 710 ◽  
pp. 72-75
Author(s):  
Meng Ni Wang ◽  
Dan Dan Yu ◽  
Qiao Jun ◽  
Xiang Hong Huang
Keyword(s):  
Elevated Temperature ◽  
Mass Loss ◽  
Adsorption Capacity ◽  
Sintering Temperature ◽  
Adsorption Property ◽  
Oxygen Adsorption ◽  
Citrate Method ◽  
Sorption Ability ◽  
Different Temperatures ◽  
Tga Analysis

A serial of Ba0.8Sr0.2Fe0.5Co0.5O3-δoxides were prepared by the citrate method and sintered at different temperatures from 400°C to 900°C. The mass loss of various samples with elevated temperature was characterized by TGA analysis. The results indicated that several kinds of compositions lost from the samples in the elevated temperature process. The oxygen adsorption capacity of these samples over a temperature range of 200-900°C were calculated by the data of TGA experiment. The sample sintered at 400°C exhibited the best oxygen sorption ability.

scholarly journals An Experimental Study of the Decomposition and Carbonation of Magnesium Carbonate for Medium Temperature Thermochemical Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1316
Author(s):  
Daniel Mahon ◽  
Gianfranco Claudio ◽  
Philip Eames
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Energy Storage ◽  
Magnesium Carbonate ◽  
Experimental Results ◽  
Future Research ◽  
Medium Temperature ◽  
Different Temperatures ◽  
Decomposition Enthalpy ◽  
Co2 Atmosphere

To improve the energy efficiency of an industrial process thermochemical energy storage (TCES) can be used to store excess or typically wasted thermal energy for utilisation later. Magnesium carbonate (MgCO3) has a turning temperature of 396 °C, a theoretical potential to store 1387 J/g and is low cost (~GBP 400/1000 kg). Research studies that assess MgCO3 for use as a medium temperature TCES material are lacking, and, given its theoretical potential, research to address this is required. Decomposition (charging) tests and carbonation (discharging) tests at a range of different temperatures and pressures, with selected different gases used during the decomposition tests, were conducted to gain a better understanding of the real potential of MgCO3 for medium temperature TCES. The thermal decomposition (charging) of MgCO3 has been investigated using thermal analysis techniques including simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA/DSC), TGA with attached residual gas analyser (RGA) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) (up to 650 °C). TGA, DSC and RGA data have been used to quantify the thermal decomposition enthalpy from each MgCO3.xH2O thermal decomposition step and separate the enthalpy from CO2 decomposition and H2O decomposition. Thermal analysis experiments were conducted at different temperatures and pressures (up to 40 bar) in a CO2 atmosphere to investigate the carbonation (discharging) and reversibility of the decarbonation–carbonation reactions for MgCO3. Experimental results have shown that MgCO3.xH2O has a three-step thermal decomposition, with a total decomposition enthalpy of ~1050 J/g under a nitrogen atmosphere. After normalisation the decomposition enthalpy due to CO2 loss equates to 1030–1054 J/g. A CO2 atmosphere is shown to change the thermal decomposition (charging) of MgCO3.xH2O, requiring a higher final temperature of ~630 °C to complete the decarbonation. The charging input power of MgCO3.xH2O was shown to vary from 4 to 8136 W/kg with different isothermal temperatures. The carbonation (discharging) of MgO was found to be problematic at pressures up to 40 bar in a pure CO2 atmosphere. The experimental results presented show MgCO3 has some characteristics that make it a candidate for thermochemical energy storage (high energy storage potential) and other characteristics that are problematic for its use (slow discharge) under the experimental test conditions. This study provides a comprehensive foundation for future research assessing the feasibility of using MgCO3 as a medium temperature TCES material. Future research to determine conditions that improve the carbonation (discharging) process of MgO is required.

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