Nickel substitution in Ln2Ba4Cu7−xNixO14+δ
| Autor: | Mark T. Weller, D.B. Currie |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Lanthanide
Materials science Extended X-ray absorption fine structure Dopant Neutron diffraction Energy Engineering and Power Technology chemistry.chemical_element Yttrium Condensed Matter Physics Magnetic susceptibility Square pyramidal molecular geometry Electronic Optical and Magnetic Materials Nickel chemistry Physical chemistry Electrical and Electronic Engineering |
| Zdroj: | Physica C: Superconductivity. 297:95-102 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(97)01854-6 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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