Premium
Location of rare‐earth atoms in isomorphous series of complex oxides by employment of difference Fourier syntheses based on X‐ray powder profile analysis: La 3 LnBaCu 5 O 13+δ (Ln = Y, La, Nd or Gd) and LnBa 2 Cu 3 O 7±δ (Ln = Y, Nd, Pr, Gd or Dy)
Author(s) -
Rangavittal N.,
Guru Row T. N.,
Rao C. N. R.
Publication year - 1993
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889892011762
Subject(s) - substituent , atom (system on chip) , fourier transform , diffraction , chemistry , crystallography , x ray , x ray crystallography , series (stratigraphy) , powder diffraction , fourier series , atomic number , analytical chemistry (journal) , stereochemistry , mathematics , physics , atomic physics , mathematical analysis , optics , organic chemistry , paleontology , computer science , biology , embedded system
Analysis of the X‐ray powder diffraction profiles of an isomorphous series of inorganic solids has been carried out for two series of complex oxides: La 3 LnBaCu 5 O 13 + δ (Ln = Y, Nd or Gd) and LnBa 2 Cu 3 O 7 + δ (Ln = Y, Nd, Pr, Gd or Dy). In this method, profile and structure refinements of a reference compound are followed by a difference Fourier synthesis to locate the positional parameters of a substituent atom. A linear correlation exists between the Fourier peak height in the difference Fourier map and the atomic number of the substituent atom. By an analysis of relative peak height in the correlation plot, the extent of cation disorder, if any, can be determined.