TY - JOUR
T1 - Effect of carbon-doping in bulk superconducting MgB2 samples
AU - Paranthaman, M.
AU - Thompson, J. R.
AU - Christen, D. K.
PY - 2001/6/1
Y1 - 2001/6/1
N2 - Bulk superconducting samples of MgB2 were prepared by solid state reaction of stoichiometric quantities of Mg turnings and B in a sealed Ta cylinder at 890°C for 2 h. The "as-synthesized" MgB2 samples had a Tc of 39 K, as defined as the onset of diamagnetism. The crystal symmetry was found to be hexagonal with lattice parameters, a = 3.0856 Å, and c = 3.5199 Å, similar to the literature values. To study the effect of carbon-doping in MgB2, various C-containing samples of x varying from 0 to 1.00 in MgB2-xCx were prepared. Magnetic characterizations indicate that the Tc onset is same for pure and C-doped samples for x = 0.05 and 0.10. However, the shielding signal decreased monotonically with C content, apparently due to the presence of carbon on the grain boundaries that isolates grains and prevents flow of supercurrents on the perimeter.
AB - Bulk superconducting samples of MgB2 were prepared by solid state reaction of stoichiometric quantities of Mg turnings and B in a sealed Ta cylinder at 890°C for 2 h. The "as-synthesized" MgB2 samples had a Tc of 39 K, as defined as the onset of diamagnetism. The crystal symmetry was found to be hexagonal with lattice parameters, a = 3.0856 Å, and c = 3.5199 Å, similar to the literature values. To study the effect of carbon-doping in MgB2, various C-containing samples of x varying from 0 to 1.00 in MgB2-xCx were prepared. Magnetic characterizations indicate that the Tc onset is same for pure and C-doped samples for x = 0.05 and 0.10. However, the shielding signal decreased monotonically with C content, apparently due to the presence of carbon on the grain boundaries that isolates grains and prevents flow of supercurrents on the perimeter.
KW - Bulk samples
KW - Carbon-doping
KW - Meissner state magnetization
KW - MgB superconductors
KW - X-ray studies
UR - http://www.scopus.com/inward/record.url?scp=0035367554&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(01)00424-5
DO - 10.1016/S0921-4534(01)00424-5
M3 - Article
AN - SCOPUS:0035367554
SN - 0921-4534
VL - 355
SP - 1
EP - 5
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -