Sintering and Microstructure - Property Relations for YBa2Cu3Ox

1987 ◽  
Vol 99 ◽  
Author(s):  
R. K. Bordia ◽  
H. S. Horowitz ◽  
M. A. Subramanian ◽  
J. B. Michel ◽  
E. M. McCarron ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Electrical Properties ◽  
High Temperature Superconductivity ◽  
Microstructural Characterization ◽  
Densification Behavior ◽  
Property Relations ◽  
Synthesis Routes ◽  
Intense Activity ◽  
Solution Routes

The recent discovery of high temperature superconductivity in YBa2Cu3O7 has led to intense activity in the processing of these oxides. The earliest attempts to synthesize these materials were based on solid state routes. These routes do not produce highly sinterable powders. Solution routes can potentially produce much more sinterable powders. We have investigated several synthesis routes - both solid state and solution. The details of these will be presented elsewhere(1). Here, we contrast the physical properties and the densification behavior of powders made via solid state and solution routes. We also present preliminary results on the microstructural characterization and electrical properties of the sintered samples.

Synthesis of Hg2Sr2-xBaxCa2Cu3O10 Superconductor and Study the Structure and Electrical Properties

2020 ◽  
Vol 1002 ◽  
pp. 230-238
Author(s):  
Shahir Fleyeh Nawaf ◽  
Nihad Ali Shafeek ◽  
Mohamed Hasan Darweesh
Keyword(s):  
Molecular Weight ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Solid State ◽  
Electrical Properties ◽  
High Temperature Superconductor ◽  
Pure Material ◽  
Best Value ◽  
Compensation Rate ◽  
Structure Properties

Compound Hg2Sr2-xBaxCa2Cu3O10 high temperature superconductor looks like (HTSC) has been prepared as a pellet by two step solid state reaction with a certain substitution percentages (0.5, 1,1.5,2) of Ba compensation rate of Sr respectively using appropriate weight of pure material Hg2O3, Sr(NO3)2, Ba(NO3)2, CaCO3, and Cu(NO3)2 proportional to their molecular weight. XRD used for study structure properties, a computer program was used to calculation of spike dimensions the lattice parameters a, b and c shows Tetragonal, Electrical resistivity at x= 1.5 of Ba are obtained when the best value of Tc= 142 K.

Enhanced electrical properties of (Li,Ce) co-doped Sr(Na0.5Bi0.5)Bi4Ti5O18 high temperature piezoceramics

RSC Advances ◽  
2016 ◽  
Vol 6 (40) ◽  
pp. 33387-33392 ◽  
Author(s):  
Zhongran Yao ◽  
Ruiqing Chu ◽  
Zhijun Xu ◽  
Jigong Hao ◽  
Guorong Li
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Electrical Properties ◽  
Solid State Reaction ◽  
Piezoelectric Ceramics ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Conventional Solid State Reaction ◽  
Reaction Method ◽  
Co Doped

Lead-free piezoelectric ceramics with the formula of Sr1−x(Li,Ce)x/2(Na0.5Bi0.5)Bi4Ti5O18 (LCSNBT-x, x = 0.0, 0.1, 0.2, 0.3, 0.4), were prepared by a conventional solid-state reaction method.

Correlation of La0.8Sr0.2MnO3-δ Powder Synthesis Routes and High Temperature Electrical Properties

2019 ◽  
Vol 7 (1) ◽  
pp. 1165-1171
Author(s):  
Matthew. J. Creedon ◽  
Yi Yang ◽  
Chandra S. Khadilkar ◽  
Aziz Shaikh
Keyword(s):  
High Temperature ◽  
Electrical Properties ◽  
Powder Synthesis ◽  
Synthesis Routes

scholarly journals Solid-state magnetic materials for magnetic levitation transport

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
D.A. Karpukhin ◽  
◽  
A.O. Petrov ◽  
V.V. Koledov ◽  
D.A. Suslov ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Solid State ◽  
Magnetic Materials ◽  
Permanent Magnets ◽  
Magnetic Levitation ◽  
High Temperature Superconductivity ◽  
Translational Motion ◽  
Practical Interest ◽  
Rare Earth Compound

Study and implementation of innovative systems of environmentally friendly and energy-efficient transport based on magnetic levitation, the principle of operation of which is based on the use of new solid-state magnetic materials based on compounds of rare earth materials, in particular materials with high-temperature superconductivity based on Y, permanent magnets based on Nd and Sm and magnetocaloric alloys based on Dy, Tb are of great interest throughout the world. In this work, the basic principles of magneto-levitation transport with the most economical principle of acceleration and deceleration - gravitational - are studied experimentally on mock-ups. The strength characteristics were measured: the levitation force and the lateral stabilization force, as well as losses during periodic translational motion of a cryostat with high-temperature superconducting elements made of ceramic material Y-Ba-Cu-O over the paths of permanent magnets made of the rare-earth compound Nd-Fe-B. A system for measuring the speed and compensation of losses for the implementation of continuous motion has been created and tested. The presented results indicate the possibility of scaling the layout project. It is concluded that the investigated scheme may be of practical interest for intracity and local transport communication with high comfort, environmental friendliness and record economy in the case of a successful solution of the problem of cooling HTSC elements to the temperature of the phase transition to the superconducting state, for example, using new principles of solid-state magnetic cooling based on compounds Dy-N, Tb-Ni, etc.

Modification of Electrical Properties of T-ZnO Whisker by Doping Fe

2008 ◽  
Vol 368-372 ◽  
pp. 487-489
Author(s):  
Xiao Zhong Huang ◽  
Han Dong Liu ◽  
Xin Xing
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Solid State ◽  
Electrical Properties ◽  
Solid State Reaction ◽  
Lattice Distortion ◽  
Volume Resistivity ◽  
Reaction Process

By means of high temperature solid-state reaction process, tetra-pod ZnO whisker (T-ZnOw) was doped with Fe(NO3)3. The doping induced the lattice distortion of the T-ZnOw, and improved its electrical properties significantly. After doping, the volume resistivity of the T-ZnOw decreased from 1010 &·cm to 103 &·cm, and its dielectric constant changed correspondingly.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

Microstructural characterization of plasma-processed Ti-Al metal matrix composites

1989 ◽  
Vol 47 ◽  
pp. 552-553
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
M. A. Burke
Keyword(s):  
High Temperature ◽  
Titanium Aluminide ◽  
Plasma Processing ◽  
Microstructural Characterization ◽  
High Temperature Strength ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Long Time ◽  
Strength And Stiffness ◽  
Intermetallic Matrix Composites

Intermetallic matrix composites are candidates for ultrahigh temperature service when light weight and high temperature strength and stiffness are required. Recent efforts to produce intermetallic matrix composites have focused on the titanium aluminide (TiAl) system with various ceramic reinforcements. In order to optimize the composition and processing of these composites it is necessary to evaluate the range of structures that can be produced in these materials and to identify the characteristics of the optimum structures. Normally, TiAl materials are difficult to process and, thus, examination of a suitable range of structures would not be feasible. However, plasma processing offers a novel method for producing composites from difficult to process component materials. By melting one or more of the component materials in a plasma and controlling deposition onto a cooled substrate, a range of structures can be produced and the method is highly suited to examining experimental composite systems. Moreover, because plasma processing involves rapid melting and very rapid cooling can be induced in the deposited composite, it is expected that processing method can avoid some of the problems, such as interfacial degradation, that are associated with the relatively long time, high temperature exposures that are induced by conventional processing methods.

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