scholarly journals Improved Superconducting Properties of Y123 Melt-solidified Bulks through Controlling Crystal Growth Direction and Cation Stoichiometry

2011 ◽  
Vol 46 (3) ◽  
pp. 125-130
Author(s):  
Tomoyuki AKASAKA ◽  
Jun-ichi SHIMOYAMA ◽  
Akiyasu YAMAMOTO ◽  
Hiraku OGINO ◽  
Kohji KISHIO
Keyword(s):  
Crystal Growth ◽  
Growth Direction ◽  
Superconducting Properties

Crystal Growth Direction Dependence of Microstructure and Superconducting Properties of Cylindrical RE123 Melt-Solidified Bulks

2006 ◽  
Vol 16 (2) ◽  
pp. 1047-1050 ◽  
Author(s):  
T. Nakashima ◽  
J. Shimoyama ◽  
Y. Tazaki ◽  
Y. Ishii ◽  
S. Horii ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Growth Direction ◽  
Superconducting Properties ◽  
Direction Dependence

Crystal growth direction dependence of microstructure and superconducting properties of novel shaped Dy123 melt-solidified bulk

2007 ◽  
Vol 463-465 ◽  
pp. 325-329 ◽  
Author(s):  
T. Nakashima ◽  
J. Shimoyama ◽  
Y. Tazaki ◽  
Y. Ishii ◽  
S. Horii ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Growth Direction ◽  
Superconducting Properties ◽  
Direction Dependence

Crystal growth of (Bi,Pb)2Sr2CaCu2Oz and their superconducting properties

1999 ◽  
pp. 435-438
Author(s):  
H. Faqir ◽  
M. Mansori ◽  
M. Kikuchi ◽  
Y. Syono ◽  
P. Satre ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Superconducting Properties

scholarly journals Recent Results in the Crystal Growth of GaN at High N2 Pressure

1996 ◽  
Vol 1 ◽  
Author(s):  
I. Grzegory ◽  
M. Bockowski ◽  
B. Lucznik ◽  
S. Krukowski ◽  
M. Wroblewski ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Growth Direction ◽  
Layer Growth ◽  
Seeded Growth ◽  
Bulk Crystal Growth ◽  
Bulk Gan ◽  
Experimental Solubility Data ◽  
Stable Growth ◽  
Image Position ◽  
Homoepitaxial Layers

We present recent results on bulk GaN crystallization. The best quality GaN crystals grown from the solution at high N2 pressure without an intentional seeding are single crystalline platelets of stable morphology reaching dimensions up to 10 mm. The fastest growth direction for such crystals is [1 0 0], perpendicular to the GaN c-axis. The maximum stable growth rate perpendicular to crystal c-axis is determined from the experiment and used for an estimate of the effective supersaturation for the {10 0} face assuming two dimensional layer growth. The heat of GaN disssolution, determined from experimental solubility data, is used for the estimation of the edge energy of 2-D nuclei on the growing {10 0} face. Bulk crystal growth seeded by a single hexagonal needle with well developed {10 0} faces is also reported. The crystallization mechanisms and morphological stability in seeded growth of GaN are discussed on the basis of experimental results. The physical properties of the GaN crystals and homoepitaxial layers grown on them are briefly reviewed.

Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Samples Fabricated by Selective Laser Melting

2018 ◽  
Vol 770 ◽  
pp. 179-186 ◽  
Author(s):  
Jing Bo Gao ◽  
Xiao Li Zhao ◽  
Ju Kun Yue ◽  
Meng Chao Qi ◽  
De Liang Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Crystal Growth ◽  
Yield Strength ◽  
Selective Laser Melting ◽  
Lamellar Structure ◽  
Growth Direction ◽  
Laser Melting ◽  
Α Phase ◽  
Dog Bone

Ti-6Al-4V (wt%) alloy samples with dog-bone and box shapes respectively were fabricated by selective laser melting (SLM). The microstructures and mechanical properties of the 3D printed Ti-6Al-4V samples with and without heat treatment were characterized and tested. The microstructures of the as-fabricated dog-bone shaped samples were mainly composed of acicular α’ phase. After annealing at 700°C, the acicular α’ phase changed into an α/β lamellar structure. After solution treatment at 955°C, water quenching and aging at 550°C, the microstructure was mainly composed of primary α phase and α/β lamellar structure. The optimum heat treatment is annealing, and the mechanical properties of the annealed sample are as follows: yield strength: 1015 MPa, ultimate tensile strength (UTS): 1083 MPa and elongation to fracture: 7.9%. The microstructures of the box-shaped samples after annealing mainly consist of α phase and α/β lamellar structure. When stretched along the direction parallel to the crystal growth direction, the yield strength and UTS of the sample are 1054 and 1090 MPa，and its elongation to fracture is 6.3%. When stretched along the direction perpendicular to the crystal growth direction, the yield strength and UTS of the sample are 1019 and 1068 MPa respectively, and its elongation to fracture is 8.7%.

scholarly journals Crystal growth and characterization of MgB2: the relation between structural and superconducting properties

2003 ◽  
Vol 16 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Sergey Lee ◽  
T Masui ◽  
H Mori ◽  
Yu Eltsev ◽  
A Yamamoto ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Superconducting Properties

Superconducting Properties of YBa2Cu3O7-δ Doped with Various Metals and Oxides

1987 ◽  
Vol 99 ◽  
Author(s):  
R. C. Sherwood ◽  
S. Jin ◽  
T. H. Tiefel ◽  
R. B. Van Dover ◽  
R. A. Fastnacht ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Crystal Growth ◽  
Superconducting Devices ◽  
Melt Processing ◽  
Complete Elimination ◽  
Practical Application ◽  
Superconducting Properties ◽  
Composite Superconductor ◽  
Superconductor Wire

ABSTRACTThe interactions of YBa2Cu3O7-δ type high Tc superconductors with other metals and oxides are of significant technical importance because of the need for i) proper stabilizing normal metal for composite superconductor wire, ii) nonreactive crucible materials for melt processing or crystal growth, and iii) suitable nonpoisonous substrate materials for thin film/thick film superconducting devices. For these reasons, and also for the purpose of exploring possible improvements in Tc, Jc and mechanical properties, the effects of various metal and oxide additions (1–40% by weight) have been investigated. It is shown that many of the elements in the periodic table deteriorate the superconducting properties to a various degree ranging from a broadened transition or reduced Tc to a complete elimination of the superconducting behavior. However, silver, gold and cadmium were relatively benign or slightly improved the properties. These benign materials have potential for practical application in superconducting composites.

scholarly journals Single Crystal Growth and Superconducting Properties of Antimony Substituted NdO0.7F0.3BiS2

2017 ◽  
Author(s):  
Satoshi Demura ◽  
Satoshi Otsuki ◽  
Yuita Fujisawa ◽  
Hideaki Sakata
Keyword(s):  
Crystal Growth ◽  
Transition Temperature ◽  
Single Crystal ◽  
Superconducting Transition Temperature ◽  
Single Crystal Growth ◽  
Layered Superconductor ◽  
Superconducting Transition ◽  
Large Decrease ◽  
Superconducting Properties ◽  
Chemical Pressure

Antimony (Sb) Substitution less than 10 % is examined on a single crystal of a layered superconductor NdO0.7F0.3BiS2. Superconducting transition temperature of the substituted samples decreases with increasing Sb concentration. A lattice constant along the c axis showed a large decrease compared with that along the a axis. Since in-plane chemical pressure monotonically decreases with increasing Sb concentration, the suppression of the superconductivity is well described in terms of the decrease in in-plane chemical pressure.

scholarly journals Bulk and Single Crystal Growth Progress of Iron-Based Superconductors (FBS): 1111 and 1144

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 20
Author(s):  
Shiv J. Singh ◽  
Mihai I. Sturza
Keyword(s):  
Crystal Growth ◽  
Experimental Studies ◽  
Short Review ◽  
Single Crystal Growth ◽  
Superconducting Properties ◽  
High Quality ◽  
Iron Based Superconductors ◽  
High Tc ◽  
Developmental Issues ◽  
Iron Based

The discovery of iron-based superconductors (FBS) and their superconducting properties has generated huge research interest and provided a very rich physics high Tc family for fundamental and experimental studies. The 1111 (REFeAsO, RE = Rare earth) and 1144 (AEAFe4As4, AE = Ca, Eu; A = K, Rb) families are the two most important families of FBS, which offer the high Tc of 58 K and 36 K with doping and without doping, respectively. Furthermore, the crystal growth of these families is not an easy process, and a lot of efforts have been reported in this direction. However, the preparation of high-quality and suitable-sized samples is still challenging. In this short review, we will summarize the growth of materials with their superconducting properties, especially polycrystals and single crystals, for the 1111 and 1144 families, and make a short comparison between them to understand the developmental issues.

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