Structural Study of Ba11Fe8Ti9O41 by X-Ray Diffraction

Published

September 1, 2000

Author(s)

T Siegrist, C Svensson, Terrell A. Vanderah, Robert S. Roth

Abstract

The crystal structure of Ba₁₁Fe₈Ti₉O₄₁ was determined using single-crystal and powder X-ray diffraction nethods. This new phase crystallizes in the hexagonal space group P6₃/mmc (No 194) (a=5.7506(3) , c=61.413(2) ; Z=2; Pcalc=5.75 g/cm³) and exhibits a 26-layer structure built from close-packed [O,(Ba,O)] layers with a stacking sequence (chcchchchcchc)₂. Octahedral sites are occupied by a mixture of Fe³⁺ and Ti⁴⁺, with some preferential ordering of the Fe ions, and tetrahedral sites are occupied by Fe³⁺. The magnetic Fe ions were observed to concentrate within four contiguous cp layers around z= and . Unusual structural features, including cation disorder associated with unreasonably short cation-cation separations, were observed to occur within these magnetic sections of the structure. Indexed X-ray powder diffraction data for polycrystalline Ba₁₁Fe₈Ti₉O₄₁ are given. Complementary structural studies of this compound using neutron and electron diffraction are underway and will be described elsewhere along with the results of dielectric and magnetic property measurements.

Citation

Solid State Sciences

Volume

2

Issue

No. 5

Pub Type

Journals

Keywords

Barium iron titanium oxide, crystal structure x-ray diffraction

Citation

Siegrist, T. , Svensson, C. , Vanderah, T. and Roth, R. (2000), Structural Study of Ba₁₁Fe₈Ti₉O₄₁ by X-Ray Diffraction, Solid State Sciences (Accessed December 10, 2024)