Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-26T18:10:49.557Z Has data issue: false hasContentIssue false
  • English
  • Français

X-ray diffraction data for the new ferroelectric tetragonal tungsten bronze phases, Ba2RETi2M3O15:M=Nb and RE=La, Pr, Nd, Sm, Gd, Dy, (Bi);M=Ta and RE=La, Nd

Published online by Cambridge University Press:  01 March 2012

Gabrielle C. Miles ,
Martin C. Stennett ,
David Pickthall ,
Caroline A. Kirk ,
Ian M. Reaney  and
Anthony R. West
Gabrielle C. Miles
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Martin C. Stennett
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
David Pickthall
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Caroline A. Kirk
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Ian M. Reaney
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Anthony R. West
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Get access Rights & Permissions [Opens in a new window]

Abstract

X-ray powder diffraction data are presented for nine new phases with the tetragonal tungsten bronze structure. By comparison with the structure of the M=Nb,RE=La analogue, these contain Ba in the large pentagonal sites with coordination number 15, a range of large rare-earth cations and Bi in the twelve coordinate sites, and the smaller cations, Ti and either Nb or Ta, in the octahedral framework sites. The a lattice parameter data of the tetragonal unit cell show an approximately linear variation with trivalent ion radius, apart from Dy, whose value appears to be anomalous; data for c show little variation with trivalent ion radius.

Type
New Diffraction Data
Information
Powder Diffraction , Volume 20 , Issue 1 , March 2005 , pp. 43 - 46
Copyright
Copyright © Cambridge University Press 2005

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

Kirk, C. A., Stennett, M. C., Reaney, I. M., and West, A. R. (2002). “A New Relaxor Ferroelectric,” J. Mater. Chem. JMACEP 12, 2609.CrossRefGoogle Scholar
Chen, X. M. and Yang, J. S. (1999). “Dielectric Characteristics of Ceramics in BaO-Nd 2O3-TiO 2-Ta 2O5 System,” J. Eur. Ceram. Soc. JECSER 10.1016/S0955-2219(98)00166-6 19, 139.CrossRefGoogle Scholar
Chen, X. M., Liu, C. L., Yang, J. S., and Wu, Y. J. (1999). “Ba4Nd 2Ti4Ta 6O30 Dielectric Ceramics Modified by Bi Substitution for Nd,” J. Solid State Chem. JSSCBI 148, 438.CrossRefGoogle Scholar
Miles, G. C., Stennett, M. C., Pickthall, D., Kirk, C. A., Reaney, I. M., and West, A. R. (in preparation).Google Scholar
Jamieson, P. B., Abrahams, S. C., and Bernstein, J. L. (1969). “Ferroelectric Tungsten Bronze-Type Crystal Structures. Π. Barium Sodium Niobate Ba(4+x)Na(2−2x)Nb10O30,” J. Chem. Phys. JCPSA6 10.1063/1.1670903 50, 4352.Google Scholar
Shannon, R. D. (1976) “Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chalcogenides, “Acta Crystallogr., Sect. A: Cryst. Phys., Diffr., Theor. Gen. Crystallogr. ACACBN 10.1107/S0567739476001551 32, 751.CrossRefGoogle Scholar