Influence of ZnO doping on the properties of single domain YBCO bulks fabricated by RE+011 TSIG process

2017 ◽  
Vol 31 (25) ◽  
pp. 1745018
Author(s):  
W. M. Yang ◽  
X. C. Yuan ◽  
Y. X. Guo
Keyword(s):  
Lattice Distortion ◽  
Levitation Force ◽  
Solid Phase ◽  
Single Domain ◽  
Pinning Force ◽  
Ybco Bulk ◽  
Trapped Field ◽  
Bulk Superconductors ◽  
Flux Pinning Force ◽  
Zno Doping

Single domain YBCO bulk superconductors with different additions of ZnO have been successfully fabricated by RE[Formula: see text]011 TSIG process with a new solid phase of [(100-[Formula: see text])(Y2O[Formula: see text]BaCuO2)+[Formula: see text]ZnO] and a new liquid phase of (Y2O3+6CuO+10BaCuO2). The effects of ZnO additions on the growth morphology, microstructure, critical temperature ([Formula: see text]), the levitation force and trapped field of the YBCO bulks have been investigated. It is found that within the range of ZnO additions [Formula: see text]=0–1.0 wt.%, all the samples are of the typical characteristic of single-domain YBCO bulk; the [Formula: see text] of the samples decreases from 92 K to 80 K when the ZnO addition [Formula: see text] increases from [Formula: see text]=0 wt.% to [Formula: see text]=1.0 wt.%; the levitation force and trapped field of the samples firstly increase and then decrease with increase of ZnO additions after going through a maximum, which is closely related with the ZnO addition and the resulting flux pinning force caused by lattice distortion due to the substitution of Zn[Formula: see text] for Cu[Formula: see text] site in the YBCO crystal; the largest levitation force 36.8 N (77 K, 0.5 T) and trapped field 0.416 T (77 K, 0.5 T) of the samples are obtained when [Formula: see text]=0.1 wt.%, respectively. This result is significantly important and helpful for us to improve the properties of YBCO bulk superconductors.

scholarly journals Effects of Gd211 Particles Characteristic in the Precursor Pellets on the Levitation Force of Single-Domain GdBCO Bulks Prepared by the Gd + 011 TSIG Method

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Xiaochun Yuan ◽  
Wanmin Yang
Keyword(s):  
Sintering Temperature ◽  
Levitation Force ◽  
Solid Phase ◽  
Single Domain ◽  
Particle Sizes ◽  
The Novel ◽  
Bulk Superconductors ◽  
Lower Porosity ◽  
Different Temperatures ◽  
Average Size

In this paper, single-domain GdBCO bulks have been fabricated by a new Gd + 011 TSIG method with precursor solid phase pellets (PSPPs) of different Gd211 particle sizes and distributions, prepared by solid state reaction with well-mixed (Gd2O3 + BaCuO2) pellets at different temperatures. The novel results indicated that (1) the average size of Gd211 particles in PSPP is monotonically increasing with increasing the sintering temperature up to 1200°C. (2) With increasing the sintering temperature from 950 to 1200°C, the porous ratio and the density of the PSPP are, respectively, monotonically decreasing and increasing. Furthermore when the sintering temperature is less than 1000°C, the porous ratio is higher and the density is lower than the values of the pressed pellets. (3) With increasing the sintering temperature, the average size of Gd211 particles in the GdBCO bulk first decreases and then increases. In addition, the smallest Gd211 particles are obtained in the sample sintered at 1050°C. (4) The maximum levitation force is obtained in the sample sintered at 1150°C with a relatively larger size of Gd211 particles and lower porosity. This result is significant when fabricating high-quality GdBCO bulk superconductors by controlling the porosity, Gd211 particle size, and their distribution characteristic.

Effect of Magnet Moving Speed on the Relaxation Rate of the Levitation Force for YBCO Bulk

2007 ◽  
Vol 546-549 ◽  
pp. 2103-2106 ◽  
Author(s):  
X.L. Wu ◽  
W.M. Yang ◽  
S.H. Zhu ◽  
J.Z. Guo ◽  
T.N. Lu ◽  
...  
Keyword(s):  
Relaxation Rate ◽  
Permanent Magnet ◽  
Measurement System ◽  
Levitation Force ◽  
Force Measurement ◽  
Single Domain ◽  
Ybco Bulk ◽  
Optimal Speed ◽  
Force Measurement System ◽  
Moving Speed

The effect of magnet moving speed on the relaxation of the maximum levitation force of YBCO bulk has been investigated. The experiment was carried out between a cylinder permanent magnet and a single-domain YBCO bulk, and the levitation force was measured using a self-made levitation force measurement system. It is found that the levitation force decreases with time after the gap distance between the magnet and YBCO bulk reduced to 2 mm and kept for the test. It is also found that the levitation force and its relaxation rate is different for different moving speed between the magnet and the YBCO bulk, and the higher the moving speed, the greater the relaxation rate of levitation force. However, the largest levitation force is obtained at an optimal speed, the higher the levitation force, and the faster the relaxation of levitation force.

The relationship of levitation force between single and multiple YBCO bulk superconductors

2002 ◽  
Vol 371 (3) ◽  
pp. 219-223 ◽  
Author(s):  
W.M Yang ◽  
L Zhou ◽  
Y Feng ◽  
P.X Zhang ◽  
C.P Zhang ◽  
...  
Keyword(s):  
Levitation Force ◽  
Ybco Bulk ◽  
Bulk Superconductors ◽  
Relationship Of ◽  
The Relationship

THE GROWTH TRACE OF SINGLE-DOMAIN YBCO BULK SUPERCONDUCTORS WITH C-AXIS NORMAL TO THE TOP SURFACE

2005 ◽  
Vol 19 (01n03) ◽  
pp. 411-414
Author(s):  
W. M. YANG ◽  
X. X. CHAO ◽  
B. X. BIN ◽  
L. ZHOU ◽  
F. YONG ◽  
...  
Keyword(s):  
Simple Model ◽  
Growth Mechanism ◽  
Bulk Sample ◽  
Single Domain ◽  
Fish Scale ◽  
Ybco Bulk ◽  
Bulk Superconductors

The grown cross traces on the top surface of single-domain YBCO bulk sample with c-axis normal to the top surface has been clearly revealed. It is found that there are many fish-scale like YBCO layers, which are well connected each other. The c-axis is normal to the top surface of the sample, which indicates that YBCO crystal starts to grow from the center to the edge along a(or b) axis in all the four regions divided by across traces, and forms a 90° angle when the four regions meet each other, The clear traces observed is just because of the slightly difference in height between adjacent regions. A simple model has been afforded to explain the growth mechanism of single-domain YBCO bulks with c-axis normal to the top surface.

scholarly journals Enhanced Mechanical Properties of Single-Domain YBCO Bulk Superconductors Processed With Artificial Holes

2019 ◽  
Vol 29 (5) ◽  
pp. 1-4 ◽  
Author(s):  
Tomas Hlasek ◽  
Kai Yuan Huang ◽  
Judit Esnoz-Larraya ◽  
Vladimir Plechacek ◽  
John Durrell ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Domain ◽  
Ybco Bulk ◽  
Bulk Superconductors

High Levitation Force and Trapped Field of Large Grain YBCO at 77K by Ga Doping

2000 ◽  
Vol 659 ◽  
Author(s):  
Yu X. Zhou ◽  
Wai Lo ◽  
Tong B. Tang ◽  
Kamel Salama
Keyword(s):  
Levitation Force ◽  
Field Trapping ◽  
Crystal Defects ◽  
Nanometer Scale ◽  
Pinning Force ◽  
Trapped Field ◽  
Flux Lines ◽  
Bulk Ybco ◽  
Magnetic Flux Lines ◽  
Ga Doping

ABSTRACTLevitation force and magnetic field trapping are the most important properties of YBCO large grain materials. They are dependent on the pinning force exerting on the magnetic flux lines by various crystal defects in YBCO. In this paper, Ga-doped bulk YBCO samples were fabricated by SmBCO seeded melt-growth process. The levitation force and trapped field were enhanced by the introduce of nanometer scale week superconducting regions which are formed by the Ga partially substituting for Cu on the Cu-O chain.

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