STUDY OF HIGH-Tc SUPERCONDUCTING MATERIALS IN (Bi.Pb)-Sr-Ca-Cu-O SYSTEM

1989 ◽  
Vol 03 (04) ◽  
pp. 595-601 ◽  
Author(s):  
YUGUI WANG ◽  
XINPING JIAO ◽  
JINSONG WANG ◽  
NANLING WANG ◽  
GUCHANG HAN
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Magnetization Measurement ◽  
Superconducting Phase ◽  
Superconducting Materials ◽  
High Tc ◽  
Preliminary Results ◽  
Zero Resistance ◽  
Weak Pinning

The high-T c superconducting materials in (Bi.Pb)-Sr-Ca-Cu-O system with zero resistance temperature of 104 K have been made by solid state reaction. The system has been compared with BiSrCaCu 2 O y composition. The preliminary results show that Pb would make the superconducting polycrystalline grains grow smaller resulting in the separation of 100–110 K and 80 K superconducting crystalline grains and connectivity among the high-T c phase grains. By comparison, the proportion of superconducting phase is not increased in the Pb doped multiphase samples. The magnetization measurement indicates that all of them belong to the weak pinning superconductors.

HIGH-Tc SUPERCONDUCTIVITY IN THE Y-Ba-Al-Cu OXIDES SYSTEM

1987 ◽  
Vol 01 (05n06) ◽  
pp. 259-263
Author(s):  
YUHUAN XU ◽  
ZHONGRONG LI ◽  
CHAORUI LI ◽  
BIN LIU ◽  
XIANDUAN LIN ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Ceramic Samples ◽  
Zero Resistance ◽  
Ceramic Manufacture

The ceramics with the composition of YBa2AlxCu3−xO9−n(0.5≤x≤2) have been synthesized directly from a solid-state reaction of Y2O3, BaCO3, A12O3, and CuO by general ceramic manufacture. The stable high-Tc superconductivity with a resistive mid-point of 101K and zero resistance temperature of 99K has been observed in ceramic samples with the composition of YBa2Al0.5Cu2.5O9−n.

EXPERIMENTAL STUDY OF THE HIGH Tc SUPERCONDUCTOR Y-Ba-Cu-O SYSTEM

1989 ◽  
Vol 03 (08) ◽  
pp. 661-664
Author(s):  
S.M.M.R. NAQVI ◽  
JAWAID ALAM ◽  
FIROZ AHMAD ◽  
MUSHEER HASAN KHAN
Keyword(s):  
Experimental Study ◽  
Superconducting Phase ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
Zero Resistance

Two batches of Y-Ba-Cu-O superconductors have been prepared. The zero resistance temperature is 90 K with Tc onset at 93 K and 95 K, respectively. Susceptibility measurements show superconducting phase at LN2. X-ray diffraction results indicates single phases.

High Tc Oxide Solid State Reaction Kinetics Via Complex Impedance Spectroscopy

1989 ◽  
Vol 169 ◽  
Author(s):  
E. A. Cooper ◽  
T. O. Mason ◽  
U. Balachandran ◽  
M. L. Kullberg
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Solid State ◽  
Solid State Reaction ◽  
Complex Impedance ◽  
Particle Size Effect ◽  
Large Temperature ◽  
Impedance Spectra ◽  
High Tc ◽  
Solid State Reaction Kinetics

AbstractImpedance spectra (5Hz ‐ 13MHz) were collected during the solid state reaction of Yba2Cu2O6+y from large monosized CuO particles imbedded in a finely divided Y2 O3 /BaCO3 matrix. No particle size effect was observed, but a large temperature effect was observed corresponding to an activation energy of approximately 1.8eV (175kJ/mol) over the range 700‐900°C.

Possibility of High-Tc Copper Fluoride Oxide Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
P. T. Wu ◽  
R. S. Liu ◽  
H. M. Sung ◽  
J. H. Rung
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Complete Loss ◽  
Oxide Superconductors ◽  
High Tc ◽  
Gel Method ◽  
Loss Of Resistance ◽  
Zero Resistance ◽  
Room Temperature Superconductivity

ABSTRACTSuperconductivity of YBa2Cu3FxOy system prepared by using a mixed solid state and gel method. A consistent and non-zero resistance drop near 280K was achieved in the nominal YBa2Cu3FxOy system for x=l and 2, with complete loss of resistance at 90K. The metal-semiconductor transition occurs at x value between 2 and 3. Temporal room temperature superconductivity with zero resistance was observed in a YBa2Cu3F2Oy sample at 308K. The phenomenon lasted for three minutes and was not reproducible.

SUPERCONDUCTING PROPERTIES OF THE HIGH Tc SUPERCONDUCTING Er-Ba-Cu-O COMPOUND

1989 ◽  
Vol 03 (03) ◽  
pp. 441-444 ◽  
Author(s):  
S. M. M. R. NAQVI ◽  
FIROZ AHMAD ◽  
JAWAID ALAM ◽  
SHARFUDDIN AHMAD
Keyword(s):  
Superconducting Phase ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
Zero Resistance ◽  
Two Phases

Two batches of Er-Ba-Cu-O superconductors have been prepared. The zero resistance temperature is 86 K with T c onsets at 99 K and 92 K respectively. Susceptibility measurements show superconducting phase at LN 2. X-ray diffraction results indicates two phases, the superconducting being the major one.

Fabrication of the New Y257 Bulk Superconductor by Melt Process

2016 ◽  
Vol 675-676 ◽  
pp. 307-311
Author(s):  
Thitipong Kruaehong ◽  
Supphadate Sujinnapram ◽  
Tunyanop Nilkamjon ◽  
Sermsuk Ratreng ◽  
Pongkaew Udomsamuthirun
Keyword(s):  
Critical Temperature ◽  
Solid State ◽  
Single Crystal ◽  
Solid State Reaction ◽  
Thermal Reaction ◽  
Superconducting Phase ◽  
Group Symmetry ◽  
Endothermic Reaction ◽  
Orthorhombic Structure ◽  
Bulk Superconductor

The Y257 superconductor was prepared by the melt process. The critical temperature of the sample is lower than sample prepared by solid state reaction. The sample are composed of 60% of superconducting phase and 40% of non-superconducting phase. The superconducting phase was orthorhombic structure and Pmmm space group symmetry. The EDX mapping indicated Y, Ba, Cu and O elements intermittently distribute in the sample. The TEM measurements indicated the SAD pattern of the single crystal and the polycrystalline. The DTA measurements indicated that the onset temperature were initially observed at around 999.848°C and offset temperature at 1018.680°C. The sample show the thermal reaction with endothermic reaction.

Preparation of Bi-Pb-Sr-Ca-Cu-O Superconductor By Thermal Decomposition of an Edta Colloid

1990 ◽  
Vol 180 ◽  
Author(s):  
H.S. Koo ◽  
C.K. Chiang ◽  
Y.T. Huang ◽  
G.C. Tu
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Solid State Reactions ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Microstructural Characteristics ◽  
High Tc ◽  
X Ray ◽  
Metal Nitrates ◽  
Zero Resistance

ABSTRACTHigh-Tc superconducting Bi-Pb-Sr-Ca-Cu oxide with zero resistance temperature at above lOOK has been synthesized via the use of ethylenediamine-tetra-acetate(EDTA) colloid and corresponding metal nitrates. Remarkable sinterability of the precursor requires shorter time to achieve superconducting phases than conventional solid-state reactions. Superconducting properties were measured electrically and magnetically. The thermal decomposition, X-ray diffraction and microstructural characteristics of the precursor and the sintered samples were also discussed.

LA1BA2CU3O9-γ: Structural Analysis as Determined by Neutron Diffraction

1987 ◽  
Vol 99 ◽  
Author(s):  
J. P. Golben ◽  
YI Song ◽  
S. Chittipeddi ◽  
S. I. Lee ◽  
R. D. Mcmichael ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Analysis ◽  
Neutron Diffraction ◽  
Special Interest ◽  
Superconducting Phase ◽  
High Tc ◽  
High Tc Superconductivity ◽  
High Temperature Superconducting ◽  
Zero Resistance ◽  
Rule Out

The La-Ba-Cu-O system contains several phases of special interest in the field of high Tc superconductivity. Specifically intriguing is the La3−xBa3+xCu6O4+y (“3–3–6”) phase [1,2], the La1·8 5Ba·1 5CuO4 (‘K2NiF4’) phase with a zero resistance temperature (Tc) of about 20 K [3,4], and the La1Ba2CU3O9–6 (“1–2–3”) phase with Tc's reported up to 75 K [5–7]. It has been suggested that the “3–3–6” phase may also be superconducting, especially in a Ba-doped version such that the stoichiometry is 2–4–6 [8–10]. In addition to defining a new high temperature superconducting phase, this latter suggestion would also rule out the possibility of Cu-0 “chains” being important to 90 K superconductivity since these chains are absent in the proposed configuration [1,2] of this phase.

scholarly journals Structural and transition tempreature of HgPb

2021 ◽  
Vol 2 (3) ◽  
pp. 496-502
Author(s):  
Baghdad Science Journal
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Technique ◽  
High Tc ◽  
High Tc Phase

solid state reaction technique (SSR) was used to prepare high-Tc phase in superconductors the effect of additional Pb to was investigated it has been found

scholarly journals Structural and transition tempreature of HgPb

2005 ◽  
Vol 2 (3) ◽  
pp. 496-502
Author(s):  
Baghdad Science Journal
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Technique ◽  
High Tc ◽  
High Tc Phase

solid state reaction technique (SSR) was used to prepare high-Tc phase in superconductors the effect of additional Pb to was investigated it has been found

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