Preparation and crystallographic properties of Sr7-x(Ca/Ba)xMn4O15

J F Vente, J R Plaisier, D J W IJdo, K V Kamenev

Research output: Contribution to journalArticlepeer-review

Abstract

Polycrystalline samples of the new phases Sr(7-x)A(x)Mn(4)O(15) (A = Ca, Ba; 0 less than or equal to x less than or equal to 1) and Sr7-2xCaxBaxMn4O15 (0 less than or equal to x less than or equal to 1)have been characterized by X-ray powder diffraction. Apart from changes in the cell parameters, no significant alterations of the crystal structure are found upon doping with Ca and/or Ba. The application of chemical pressure causes an anisotropic change of the unit cell with the a (Ca) and b (Ba) axes showing the largest changes. The compounds with double-doping Sr7-2xCaxBaxMn4O15 show a more complicated behavior. The cell volume is linear dependent on the average ionic radius of the A-cation, for all compounds. Ca enters the structure on the small Sr(1) site, whereas Ba occupies the larger Sr(3) and Sr(4) sites. The results show that the structure of Sr7Mn4O15 is flexible with respect to the average size of the A-cation. (C) 2001 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2437-2444
Number of pages8
JournalMaterials research bulletin
Volume35
Issue number14-15
Publication statusPublished - Nov 2000

Keywords

  • electronic materials
  • oxides
  • X-ray diffraction
  • crystal structure
  • RUDDLESDEN-POPPER COMPOUND
  • COLOSSAL MAGNETORESISTANCE
  • GIANT MAGNETORESISTANCE
  • CA4MN3O10

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