The synthesis and characterization of the HgBa2Ca2Cu3O8+δ and HgBa2Ca3Cu4O10+δ phases
| Autor: | Evgeny V. Antipov, J.J. Capponi, C. Chaillout, M. Marezio, S. N. Putilin, Pierre Bordet, J.L. Tholence, Sergio Paulo Martins Loureiro |
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| Rok vydání: | 1993 |
| Předmět: |
Materials science
Annealing (metallurgy) Stacking Energy Engineering and Power Technology Condensed Matter Physics Microstructure Magnetic susceptibility Electronic Optical and Magnetic Materials law.invention Crystallography Tetragonal crystal system Homologous series chemistry.chemical_compound chemistry law Lattice (order) Electrical and Electronic Engineering Electron microscope |
| Zdroj: | Physica C: Superconductivity. 215:1-10 |
| ISSN: | 0921-4534 |
| Popis: | The third (Hg-1223) and the fourth (Hg-1234) members of the recently-discovered homologous series HgBa2Can−1CunO2n+2+δ have been synthesized by solid state reaction, carried out at 950°C under 50 kbar at different annealing times. These phases have a tetragonal cell with lattice parameters: a = 3.8532 (6) A , c = 15.818(2) A , and a = 3.8540(3) A , c = 19.006 (3) A , respectively. The c parameters are in agreement with the formula c ≌ 9.5 + 3.2 (n − 1). Electron microscopy study showed similar lattice parameters as well as the occurence of different intergrowths and stacking faults. A periodicity of 22 A has also been detected, which may be attributed to the existence of the Hg-1245 phase. EDS analysis data of several grains of Hg-1223 and Hg-1234 are in agreement with the proposed chemical formulae. AC susceptibility measurements show that an increase of the superconducting transition temperature with n in the HgBa2Can−1CunO2n+2+δ series occurs till the third member, after which a saturation seems to be achieved. |
| Databáze: | OpenAIRE |
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