Electron microscopy studies of the mercury-based superconductor HgBa2CuO4+δ

✍ Scribed by I. Bryntse; S.N. Putilin

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 836 KB
• Volume: 212
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90507-m

✦ Synopsis

The new Hg-based superconductor HgBa2CuO4+a has been studied with scanning electron microscopy, high-resolution electron microscopy and energy dispersive spectrometry analysis. The diffraction patterns confirmed the primitive unit cell obtained from X-ray powder data (space group P4/mmm, a= 3.8797(5 ) A, c= 9.509 (2) A) and showed that the structure is well ordered. The metal content is approximately the same as in the above formula, recently proved by X-ray analysis [Putilin et al., Nature 362 ( 1993 ) 226 ]. It was possible to obtain high-resolution photographs in reasonable agreement with simulated images. Besides the superconducting phase, some other phases exist in the synthesized samples, one of them probably amorphous. The possibility of i ntergrowths between different members of the homologous series HgBa2R,_ ~Cu,O2,+ 2+~ is shown.