The role of F-doping and the sintering temperature on the superconductivity and lattice constants in LaOFeGe compounds

2021 ◽  
Vol 1 (1) ◽  
pp. 12-17
Keyword(s):  
Sintering Temperature ◽  
Lattice Constants

scholarly journals Role of Sintering Temperature in Production of Nepheline Ceramics-Based Geopolymer with Addition of Ultra-High Molecular Weight Polyethylene

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1077
Author(s):  
Romisuhani Ahmad ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Wan Mastura Wan Ibrahim ◽  
Kamarudin Hussin ◽  
Fakhryna Hannanee Ahmad Zaidi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Microstructural Properties ◽  
Sintering Process ◽  
Final Microstructure ◽  
Change Of Microstructure ◽  
Ultra High Molecular Weight

The primary motivation of developing ceramic materials using geopolymer method is to minimize the reliance on high sintering temperatures. The ultra-high molecular weight polyethylene (UHMWPE) was added as binder and reinforces the nepheline ceramics based geopolymer. The samples were sintered at 900 °C, 1000 °C, 1100 °C, and 1200 °C to elucidate the influence of sintering on the physical and microstructural properties. The results indicated that a maximum flexural strength of 92 MPa is attainable once the samples are used to be sintered at 1200 °C. It was also determined that the density, porosity, volumetric shrinkage, and water absorption of the samples also affected by the sintering due to the change of microstructure and crystallinity. The IR spectra reveal that the band at around 1400 cm−1 becomes weak, indicating that sodium carbonate decomposed and began to react with the silica and alumina released from gels to form nepheline phases. The sintering process influence in the development of the final microstructure thus improving the properties of the ceramic materials.

3d—MAGNETISM OF THE RT4B COMPOUNDS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 798-801
Author(s):  
T.T. DUNG ◽  
N.P. THUY ◽  
T.D. HIEN ◽  
N.M. HONG ◽  
D.C. KHAN ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Cell Volume ◽  
Unit Cell Volume ◽  
Magnetocrystalline Anisotropy ◽  
Close Correlation ◽  
Spin Reorientation ◽  
Lattice Constants ◽  
Spontaneous Magnetostriction ◽  
Relative Value

Spontaneous-magnetostriction and FMR studies are reported for the series Y(CO1−xFex)4B with x=0.00, 0.0125, 0.02 and 0.125. For the samples with composition x=0.00, 0.0125 and 0.02, step-like changes of the lattice constants a and c around the spin reorientation temperature TSR are observed. The relative values of the changes in ∆a/a and ∆c/c are of the order of 10−4 but are of opposite signs. The changes in the unit cell volume ∆V/V around TSR are negligible. In the temperature dependence of the average g-values of these samples, a step-like change with a relative value for ∆g/g of 10−2 has been deduced from FMR studies. These results point to a close correlation between the lattice constants and the magnetocrystalline anisotropy of the 3d-lattice and consequently to the role of the orbital moments in the anisotropic properties of the 3d-magnetism in the considered compounds.

Effect of Zr and C co-addition on the characteristics of ZrB2-based ceramics: Role of spark plasma sintering temperature

2020 ◽  
Vol 46 (16) ◽  
pp. 24975-24985 ◽  
Author(s):  
Behzad Nayebi ◽  
Nader Parvin ◽  
Jamshid Aghazadeh Mohandesi ◽  
Mehdi Shahedi Asl
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Co Addition

Role of the Crystal Lattice Constants and Band Structures in the Optoelectronic Spectra of CdGa2S4by DFT Approaches

2017 ◽  
Vol 643 (13) ◽  
pp. 839-849 ◽  
Author(s):  
H. A. Rahnamaye Aliabad ◽  
Hamide Vaezi ◽  
Shiva Basirat ◽  
Iftikhar Ahmad
Keyword(s):  
Crystal Lattice ◽  
Band Structures ◽  
Lattice Constants

Influences of sintering temperature on the electrical conductivity of GDC-50vol%MgO composite ceramics: the role of the GDC/MgO heterogeneous interface

Ionics ◽  
2020 ◽  
Vol 27 (1) ◽  
pp. 269-277
Author(s):  
Qian Zheng ◽  
Heng Zhang ◽  
Bin Meng ◽  
Wenke Liang ◽  
Chen Li ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Sintering Temperature ◽  
Composite Ceramics

The Improvement Method Design for β-SiC Recrystallization

2011 ◽  
Vol 55-57 ◽  
pp. 578-581
Author(s):  
Bing Quan He ◽  
Wen Ting Chen ◽  
Yang Zheng
Keyword(s):  
Production Process ◽  
Fine Particles ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
Impact Resistance ◽  
High Strength ◽  
Sic Ceramics ◽  
High Oxidation Resistance

Sintered SiC ceramics with difficulty, and its production process and production are more expensive, lower sintering temperature of SiC ceramics and look for new low-cost production process is the focus of materials research workers. Re-crystallization of SiC components of the raw materials requirements of high purity, can not add sintering aids, sintering temperature up to about 2450°C). In this paper, by improving and optimizing the existing production process, to lower the sintering temperature of the new methods and ideas, the study shows that: β-SiC will be added to the sintered α-SiC slurry, and the best particle size ratio of α: β = 15:1 mixture, at the same time, according to re-crystallization of SiC sintering theory, the fine particles (β-SiC, has played the role of sintering agent) adsorption in the coarse particle (α-SiC, the role of the support skeleton) and can greatly reduce the SiC Sintering temperature (50-100°C), and to improve the purity of α-SiC, the most economical way to prepare a high-density, high oxidation resistance, high impact resistance, high strength, high mechanical properties of recrystallized SiC powder .

Sol-Gel Derived PZT and PZTN Ceramics: A Role of Sintering Temperature

2009 ◽  
Vol 382 (1) ◽  
pp. 147-152 ◽  
Author(s):  
Chontira Sangsubun ◽  
Anucha Watcharapasorn ◽  
Sukanda Jiansirisomboon
Keyword(s):  
Sintering Temperature ◽  
Sol Gel

Low Temperature Sintering of BaO–ZnO–TiO2 Ceramics for LTCC Applications

2012 ◽  
Vol 476-478 ◽  
pp. 917-922 ◽  
Author(s):  
Sheng Quan Yu ◽  
Shu Meng Sun ◽  
Bin Tang ◽  
Shu Ren Zhang
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Sintering Aids ◽  
Promising Candidate ◽  
High Q ◽  
Microwave Dielectric ◽  
Ag Electrodes

In order to develop a new middle dielectric constant LTCC materials, the effects of BaO–ZnO–TiO2–B2O3–SiO2(BZTBS) and/or BaCu(B2O5)(BCB2) on the phase composition, microstructure and microwave dielectric properties of BaO–ZnO–TiO2 ceramics were investigated by solid-state reaction. It was found that BCB2 mainly worked as sintering aids to lower the sintering temperature and the key role of BZTBS was to affect the phase composition in favour of showing a high Q×f value. Therefore, when 5wt% BZTBS+6wt% BCB2 were co-doped, the sintering temperature was down to 850°C, and the microwave dielectric properties were improved significantly because the densification and grain size distribution were not only improved but also the phase composition was controlled. At last, this ceramics sintered at 850°C for 0.5 h showed good microwave dielectric properties: εr=28.4, Q×f=8,030 GHz and τf=2 ppm/°C. Also, it was compatible with Ag electrodes, so it was a promising candidate for LTCC application.

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