New Members of the RuSr 2 RECu 2 O 8 Family of Phases (RE=Rare Earth) Obtained at High Pressure and Temperature

Autor:	J. M. Gallardo-Amores, R. Ruiz-Bustos, V. García-Baonza, Emilio Morán, Miguel Á. Alario-Franco
Rok vydání:	2002
Předmět:	Lanthanide Materials science Gadolinium chemistry.chemical_element Crystal structure Condensed Matter Physics Spectral line symbols.namesake Tetragonal crystal system Crystallography chemistry High pressure symbols Cuprate Raman spectroscopy
Zdroj:	High Pressure Research. 22:573-576
ISSN:	1477-2299 0895-7959
DOI:	10.1080/08957950212458
Popis:	At room pressure, Sm, Eu and Gd seem to be the only RE elements that accept to enter into the structure of RuSr 2 GdCu 2 O 8 . However high pressure and high temperatures allow one to replace gadolinium by other lanthanide cations. We have been successful in replacing Gd by Y, La, Pr, Nd, Tb, Dy, Ho and Er. X-ray diffraction patterns fitted by the Rietveld method show that the average crystal structure of RuSr 2 RECu 2 O 8 is tetragonal with P 4/ mmm space group symmetry. Micro-Raman experiments have been performed on RuSr 2 GdCu 2 O 8 samples synthesized at both high and room pressure; the resulting spectra are consistent with the same structure, since there are no major changes in the low-frequency range.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2672ef6072ed77eac842e96452459c4d https://doi.org/10.1080/08957950212458 Zobrazit plný text záznamu