An X-ray Powder Diffraction Study of Sr2LnTaCu2O8, Ln = Nd, Sm, Eu, Gd (CROSBI ID 77667)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Gržeta, Biserka ; Toraya, Hideo ; Brničević, Nevenka ; Bašic, Ivan ; Planinić, Pavica
engleski
An X-ray Powder Diffraction Study of Sr2LnTaCu2O8, Ln = Nd, Sm, Eu, Gd
A series of oxides of the composition Sr_2LnTaCu_2O_8, Ln = Nd, Sm, Eu, Gd has been characterized by X-ray powder diffraction. Samples are tetragonal, space group P4/mmm and isostructural with a perovskite-like phase Ba_2LnTaCu_2O_8. The unit-cell parameters have been determined using Mo or Si as internal standard. The structure of Sr_2SmTaCu_2O_8 has been refined by the Rietveld method. X-ray diffraction patterns of the samples and the crystal structure of Sr_2SmTaCu_2O_8 showed ordering of Ta and Cu ions: the octahedrally coordinated Ta ion is on the Cu(1) site, while Cu ions remain on the Cu(2) sites of the Ba_2YCu_3O_(7-delta)-type structure.
mixed-metal oxides ; molecular structures ; Rietveld method ; semiconducting properties
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
29 (1)
1996.
37-41
objavljeno
0021-8898
1600-5767
10.1107/S002188989500879X