Hostname: page-component-848d4c4894-wzw2p Total loading time: 0 Render date: 2024-05-04T00:16:04.650Z Has data issue: false hasContentIssue false
  • English
  • Français

Cation Site Mixing for Strain Relief in Three-Layer Aurivillius Ceramics

Published online by Cambridge University Press:  11 February 2011

Michael S. Haluska  and
Scott T. Misture
Michael S. Haluska
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, NY 14802
Scott T. Misture
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, NY 14802
Get access

Abstract

Three-layer Aurivillius ceramics Bi2SrCaNb2TiO12, Bi2Sr1.5Ca.5Nb2TiO12, Bi2Sr2Nb2TiO12, Bi2Sr1.5Ba.5Nb2TiO12, Bi2SrBaNb2TiO12 were formed via solid-state synthesis and their structures characterized by Rietveld analysis of powder x-ray diffraction data. Site mixing was observed for all species with the largest amount of mixing occurring in Bi2SrBaNb2TiO12. Bond valence sum calculations (BVS) showed that the A-site BVS increased from underbonded in the Bi2SrCaNb2TiO12 composition to overbonded in Bi2SrBaNb2TiO12. The A-site BVS increased linearly with lattice parameter and average A-site cation radius. Bi-site position relaxation was observed as the average size of the alkaline earth cation on the Bi-site increased. Site mixing occurs in these compounds in order to relieve interlayer strain between the (Bi2O2)2+ layer and the perovskite blocks, between the Nb and Ti-layers of the perovskite blocks, and to reduce the BVS of the perovskite A-site.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD4.10
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Aurivillius, B., “Mixed Bismuth Oxides with Layer Lattices; II, Structure of Bi4Ti3O12 ,” Arkiv fur Kemi, 1 [58] 499–512 (1949).Google Scholar
2. Hervoches, C.H., Lightfoot, P., “Cation Disorder in Three-Layer Aurivillius Phases: Structural Studies of Bi2-xSr2+xTi1-xNb2+xO12 (0<x<0.8) and Bi4-xLaxTi3O12 (x =1 and 2)” Journal of Solid State Chemistry 153 [1] 66–73 (2000).Google Scholar
3. Blake, S., Falconer, M., McCreedy, M., Lightfoot, P., “Cation Disorder in Ferroelectric Aurivillius Phases of the Type Bi2ANb2O9 (A = Ba, Sr, Ca),” Journal of Materials Chemistry 7 [8] 1609–1613 (1997).Google Scholar
4. Brown, I., “Chemical and Steric Constraints in Inorganic Solids,” Acta Crystallographica B48 553–572 (1992).Google Scholar
5. Larson, A.C. and Von Dreele, R.B., “General Structure Analysis System (GSAS)”, Los Alamos National Laboratory Report LAUR 86–748 (2000).Google Scholar
6. Toby, B. H., EXPGUI, a graphical user interface for GSAS , J. Appl. Cryst. 34 210–213 (2001).Google Scholar
7. Armstrong, R., Newnham, R., “Bismuth Titanate Solid Solutions,” Materials Research Bulletin 7 1025–1034 (1972).Google Scholar