TY - JOUR
T1 - Nickel substitution in Ln2Ba4Cu7−xNixO14+δ: (Ln=lanthanide, yttrium)
AU - Currie, D.B.
AU - Weller, M.T.
PY - 1998/3/1
Y1 - 1998/3/1
N2 - The system Ln2Ba4Cu7−xNixO14+δ (247), Ln=lanthanide, yttrium, has been investigated by powder X-ray and neutron diffraction, thermogravimetric analysis and magnetic susceptibility measurements. Extended X-ray absorption fine structure (EXAFS) experiments at the Ni K-edge have been carried out on a number of the compounds. Results have shown that, as with the related material YBa2Cu3O7−δ (123), nickel doping takes place predominantly at the square pyramidal copper sites, with some occupation at the square planar sites at low dopant levels. A deterioration of the superconducting properties following introduction of nickel content is observed.
AB - The system Ln2Ba4Cu7−xNixO14+δ (247), Ln=lanthanide, yttrium, has been investigated by powder X-ray and neutron diffraction, thermogravimetric analysis and magnetic susceptibility measurements. Extended X-ray absorption fine structure (EXAFS) experiments at the Ni K-edge have been carried out on a number of the compounds. Results have shown that, as with the related material YBa2Cu3O7−δ (123), nickel doping takes place predominantly at the square pyramidal copper sites, with some occupation at the square planar sites at low dopant levels. A deterioration of the superconducting properties following introduction of nickel content is observed.
UR - http://www.scopus.com/inward/record.url?scp=0032023323&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/S0921-4534(97)01854-6
U2 - 10.1016/S0921-4534(97)01854-6
DO - 10.1016/S0921-4534(97)01854-6
M3 - Article
AN - SCOPUS:0032023323
SN - 0921-4534
VL - 297
SP - 95
EP - 102
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -