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Journal of Applied Physics / Volume 101 / Issue 10 / DIELECTRICS AND FERROELECTRICITY

J. Appl. Phys. 101, 104114 (2007); http://dx.doi.org/10.1063/1.2205720 (7 pages)

Dielectric and structural studies of Ba2MTi2Nb3O15 (BMTNO15, M = Bi3+,La3+,Nd3+,Sm3+,Gd3+) tetragonal tungsten bronze-structured ceramics

M. C. Stennett1, I. M. Reaney1, G. C. Miles1, D. I. Woodward1, A. R. West1, C. A. Kirk2, and I. Levin3

1Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom
2Mineralogy Department, Natural History Museum, London SW7 5BD, United Kingdom
3Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

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(Received 26 October 2005; accepted 26 March 2006; published online 29 May 2007)

The structure and dielectric properties of a new family of tetragonal tungsten bronze (TTB) ceramics with the general formula, Ba2MTi2Nb3O15 where M = Bi3+,La3+,Nd3+,Sm3+,Gd3+, have been investigated. Hereafter the compositions will be referred to by the abbreviation BMTNO15 where M = B(Bi3+), L(La3+), N(Nd3+), S(Sm3+) or G(Gd3+). BLTNO15 [permittivity maximum (Tm) ∼ −80 °C] and BBTNO15 (Tm ∼ −100 °C) exhibited relaxorlike dielectric behavior. In contrast, BNTNO15 (Tm ∼ 165 °C), BSTNO15 (Tm ∼ 250 °C), and BGTNO15 (Tm ∼ 320 °C) were classic ferroelectrics. Tm increased with decreasing radius of the M ion. Room temperature x-ray powder diffraction (XRD) patterns of all the compounds indexed on a prototype P4/mbm (or P4bm) space group with lattice parameters a ≈ 12.4 Å and c ≈ 4 Å. However, electron diffraction revealed that the relaxor phases, BLTNO15 and BBTNO15, exhibited an incommensurate modulation, whereas the classic ferroelectric BNTNO15, BSTNO15, and BGTNO15 featured an orthorhombic superstructure with lattice parameters a ≈ b ≈ √2aTTB and c ≈ 2cTTB.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
    1. Powder preparation and characterization
    2. Microstructural analysis
    3. Electrical measurements
  3. RESULTS
    1. Structural and microstructural characterizations
    2. Electrical characterization
  4. DISCUSSION
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

barium compounds, bismuth compounds, lanthanum compounds, neodymium compounds, samarium compounds, gadolinium compounds, titanium compounds, ferroelectric ceramics, relaxor ferroelectrics, permittivity, X-ray diffraction, lattice constants, electron diffraction, crystal structure

PACS

  • 77.84.Ek

    Niobates and tantalates

  • 77.84.Cg

    PZT ceramics and other titanates

  • 77.80.-e

    Ferroelectricity and antiferroelectricity

  • 77.22.Ch

    Permittivity (dielectric function)

  • 61.66.Fn

    Inorganic compounds

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2205720

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. B. Jamieson, S. C. Abrahams, and J. L. Bernstein, J. Chem. Phys. 48, 5048 (1968)JCPSA6000048000011005048000001.

    D. Viehland, J. F. Li, S. J. Jang, L. E. Cross, and M. Wuttig, Phys. Rev. B 46, 8013 (1992).


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