scholarly journals Chiral twist on the high- Tc phase diagram in moiré heterostructures

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Yu-Ping Lin ◽  
Rahul M. Nandkishore
Keyword(s):  
Phase Diagram ◽  
High Tc ◽  
High Tc Phase

Phase diagram studies of the BiO1.5PbOSrOCaOCuO system and the formation process of the “2223 (high-Tc)” phase

1991 ◽  
Vol 190 (1-2) ◽  
pp. 18-21 ◽  
Author(s):  
Y. Ikeda ◽  
H. Ito ◽  
S. Shimomura ◽  
Z. Hiroi ◽  
M. Takano ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Formation Process ◽  
High Tc ◽  
High Tc Phase

Modulated structures in (Bi,Pb)-Sr-Ca-Cu-O films

1990 ◽  
Vol 48 (4) ◽  
pp. 62-63
Author(s):  
Shozo Ikeda ◽  
Hirotoshi Hayakawa ◽  
Daniel R. Dietderich
Keyword(s):  
Rf Magnetron Sputtering ◽  
Potential Method ◽  
High Tc ◽  
Bscco System ◽  
Heat Treated ◽  
Modulated Structures ◽  
High Tc Phase ◽  
Deposited Films ◽  
Sputtering System

Pb addition makes easier to form the high Tc phase in the BSCCO system. However, Pb easily vaporized at high temperature. A controlled Pb potential method has been applied to grow the high Tc phase in films. Initially, films are deposited on cleaved MgO substrates using an rf magnetron sputtering system. These amorphous as-deposited films are heat treated in a sealed gold capsule along with a large pellet of Pb-added BSCCO. Details of the process and characterization of the films have been reported elsewhere (1). Films trated for 0.5h at 850° C contain mainly the low Tc phase with a small amount of the high Tc phase. Hawever, films treated for 3h at 850°C consist mainly of the high Tc phase. This film is superconductive with a Tc(zero) of 106K. The Pb/Bi ratio of the films, analysed by SEM- EDS, are 0.12 and 0.18 for heat tratment times of 0.5 and 3h, respectively. The present study investigates the modulated structures of these films using HREM.

Synthesis and study the Structural and electrical and mechanical properties of High Temperature Superconductor Tl0.5Pb0.5Ba2Can-1Cun-xNixO2n+3-δ Substituted with nickel oxide for n=3

2018 ◽  
Vol 31 (3) ◽  
pp. 26 ◽  
Author(s):  
Laheeb. A. Mohammed ◽  
Kareem. A. Jasim
Keyword(s):  
Nickel Oxide ◽  
High Temperature Superconductor ◽  
Sintering Temperature ◽  
Concentration Effects ◽  
High Tc ◽  
Xrd Diffraction ◽  
Ni Content ◽  
High Tc Phase ◽  
Pure Phases ◽  
Critical Temperature Tc

   on this research is to study the effect of nickel oxide substitution on the pure phases superconductor Tl0.5Pb0.5Ba2Can-1Cun-xNixO2n+3-δ (n=3) where x=(0,0.2,0.4,0.6,0.8.and 1.0). The specimens in this work were prepared with used  procedure of solid state reaction with sintering temperature 8500C for 24 h .we used technical (4-prob)to calculated and the critical temperature Tc . The results of the XRD diffraction analysis showed that the structure for pure and doped phases was tetragonal with phases high-Tc phase (1223),(1212) and low-Tc phase (1202)  and add to the presence of some impure phase. It was noted the value a=b,c  the parameter of  the lattice increment  with the increment of Ni content. The increment of (NiO) concentration effects electrical resistivity, dielectric constant and the hardness.

scholarly journals Effect of Ba addition on the formation of the high-Tc phase in the Bi, Pb-Sr-Ca-Cu-O system.

1988 ◽  
Vol 35 (9) ◽  
pp. 1003-1009 ◽  
Author(s):  
Jun Takada ◽  
Hitoshi Kitaguchi ◽  
Kiichi Oda ◽  
Akiyoshi Osaka ◽  
Yoshinari Miura ◽  
...  
Keyword(s):  
High Tc ◽  
High Tc Phase

scholarly journals Influence of calcining temperature on formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system.

1990 ◽  
Vol 37 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Jun Takada ◽  
Toshio Egi ◽  
Kiichi Oda ◽  
Hitoshi Kitaguchi ◽  
Akiyoshi Osaka ◽  
...  
Keyword(s):  
High Tc ◽  
High Tc Phase

scholarly journals Formation and electrical property of a high-Tc phase Bi,Pb-Sr-Ca-Cu-O superconductor.

1989 ◽  
Vol 36 (5) ◽  
pp. 527-532 ◽  
Author(s):  
Jun Takada ◽  
Kiichi Oda ◽  
Toshio Egi ◽  
Hitoshi Kitaguchi ◽  
Akiyoshi Osaka ◽  
...  
Keyword(s):  
Electrical Property ◽  
High Tc ◽  
High Tc Phase
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