DOI

  • I. Zvereva
  • Yu Smirnov
  • V. Gusarov
  • V. Popova
  • Jacques Choisnet

The series of complex aluminates RE2SrAl2O7 (RE = La, Nd, Sm, Eu, Gd, Tb, Dy, Ho) was prepared at 1450°C. Their structure is the double perovskite slab-rocksalt layer P2/RS intergrowth of the n = 2 Ruddelsden-Popper phases. X-ray Rietveld refinement calculations point to a progressive RE-Sr ordering between the ninefold sites in the RS layers and the twelvefold one in the P2 slabs, respectively. This ordering proves both to improve the ease to prepare these aluminates and stabilize their intergrowth structure. The limit observed for RE = Ho corresponds to a nearly fully ordered distribution of the Ho3+ and Sr2+ cations - 91%. Due to an excess structure-bonding anisotropy in the ninefold sites, a further extent to smaller RE3+ cations is unsuccessful. These results well compare with those regarding the magnetoresistant manganites RE1 + xSr2 - xMn2O7: increasing RE-Sr ordering and limit found for Er. The big size A element long range ordering phenomena which are unlikely to depend on redox phenomena of the B element in the P2 slabs, have to be considered as specific trends of the P2/RS intergrowth type complex oxides.

Язык оригиналаанглийский
Страницы (с-по)343-349
Число страниц7
ЖурналSolid State Sciences
Том5
Номер выпуска2
DOI
СостояниеОпубликовано - 1 фев 2003

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ID: 87767506