| Автор | B Jayaram |
| Автор | P C Lanchester |
| Автор | M T Weller |
| Автор | J R Grasmeder |
| Автор | P A J de Groot |
| Автор | G P Rapson |
| Дата выпуска | 1989-01-16 |
| dc.description | A number of samples of Bi<sub>2-x</sub>Pb<sub>x</sub>Sr<sub>2</sub>Ca<sub>3</sub>Cu<sub>4</sub>O<sub>y</sub> (0<or=x<or=0.8) have been prepared by solid state reaction. All major peaks in the powder diffraction spectra of samples with x=0.2 and 0.4 could be attributed to the Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> phase with slight orthorhombic distortion. Resistivity measurements of these samples showed zero resistance at 100 K with onset of superconductivity around 110 K. The effect of variations of sintering and annealing have been studied in order to optimize conditions for obtaining the 110 K phase. From flux exclusion measurements the volume fraction of the high-T<sub>c</sub> phase is estimated to be around 40% at best. These studies tentatively indicate that Pb substitutes preferentially on the Ca site rather than the Bi site in the Bi-Sr-Ca-Cu-O lattice. Samples with x=0.0 and x>0.4 showed zero resistance around 70 K with no indication of a phase with a higher T<sub>c</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Stabilisation of the 110 K phase in Pb-substituted Bi-Sr-Ca-Cu-O |
| Тип | lett |
| DOI | 10.1088/0953-8984/1/2/017 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 1 |
| Первая страница | 477 |
| Последняя страница | 484 |
| Аффилиация | B Jayaram; Dept. of Phys., Southampton Univ., UK |
| Аффилиация | P C Lanchester; Dept. of Phys., Southampton Univ., UK |
| Аффилиация | M T Weller; Dept. of Phys., Southampton Univ., UK |
| Аффилиация | J R Grasmeder; Dept. of Phys., Southampton Univ., UK |
| Аффилиация | P A J de Groot; Dept. of Phys., Southampton Univ., UK |
| Аффилиация | G P Rapson; Dept. of Phys., Southampton Univ., UK |
| Выпуск | 2 |
