Superconducting properties of single-crystal Nb sphere formed by large-undercooling solidification process

Numerical simulation and prediction of grain formation and defects, including the stray grain and high angle orientation deviation during directional solidification process of a single crystal superalloy hollow turbine blade are experimentally conducted by means of commercial software ProCAST and backscattering scanning electron microscope. The results show that the initial nucleation amount at the beginning section of the starter block is 104 of magnitude, and the number of grains decreases gradually with the competitive growth, and the number is about 100 at the spiral of the selector. And the orientation distribution of grains is close to <001> direction, with the orientation deviation between 10° and 15°. Moreover, with the increase of withdrawal rate, the curvature of isoline of liquidus of single crystal blade increases, and the tendency to form stray grains defects increases. The grain with a large deviation from orientation blocks the growth of other grains at the first rotating transition site of the selector, and then gradually grows and solidifies to form the final blade.

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Enhancement of superconducting properties and flux pinning mechanism on Cr0.0005NbSe2 single crystal under Hydrostatic pressure

Scientific Reports ◽

10.1038/s41598-018-36672-x ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 6

Author(s):

S. Arumugam ◽

Manikandan Krishnan ◽

Kent Ishigaki ◽

Jun Gouchi ◽

Rukshana Pervin ◽

...

Keyword(s):

Hydrostatic Pressure ◽

Single Crystal ◽

Flux Pinning ◽

Superconducting Properties ◽

Pinning Mechanism

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Neutron fluence dependence of superconducting properties and crystal structure on Bi2Sr2CaCu3Oy single crystal

Physica C Superconductivity ◽

10.1016/0921-4534(94)91014-6 ◽

1994 ◽

Vol 235-240 ◽

pp. 2975-2976 ◽

Cited By ~ 6

Author(s):

K. Kusagaya ◽

T. Terai ◽

N. Chikumoto ◽

T. Kobayashi ◽

J. Shimoyama ◽

...

Keyword(s):

Crystal Structure ◽

Single Crystal ◽

Neutron Fluence ◽

Superconducting Properties ◽

Fluence Dependence

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SUPERCONDUCTING PROPERTIES OF (Tl0.64Bi0.16Pb0.2)Ba2−xSrxCa3Cu4Oy BY LIQUID-GAS-SOLIDIFICATION PROCESSING

Modern Physics Letters B ◽

10.1142/s0217984991002082 ◽

1991 ◽

Vol 05 (26) ◽

pp. 1735-1743

Author(s):

H. CHOU ◽

H.S. CHEN ◽

E.M. GYORGY ◽

A.R. KORTAN ◽

L.C. KIMERLING ◽

...

Keyword(s):

Phase Transformation ◽

Solidification Process ◽

Tetragonal Structure ◽

Layer Formation ◽

Superconducting Properties ◽

Solidification Processing ◽

Resistivity Measurements ◽

Percolation Limit ◽

Non Equilibrium

The effect of Sr substitution in (Tl0.64Bi0.16Pb0.2)Ba2−xSrxCa3Cu4Oy(x=0, 1, 2) superconductors is studied by liquid-gas-solidification process. (Tl0.64Bi0.16Pb0.2)Ba2−x SrxCa3Cu4Oy forms a tetragonal structure, with a c axis decreasing with Sr content. The substitution of Sr tends to suppress Cu-O layer formation. It also slows down the phase transformation from Tl-rich to Tl-poor phases which may be attributed to a phase equilibration of kinetic origin. The superconducting crystals grow under non-equilibrium and anisotropic conditions, and exhibit platelet and dentritic morphologies. The resistivity measurements indicate percolation effects with a percolation limit of just above 8% of the high Tc phase.

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