Skip to content

Research at St Andrews

Structural, electrical and relaxor properties of Sc-In solid solution in tetragonal tungsten bronze ceramics

Research output: Contribution to journalArticle


Andrei Rotaru, Finlay D. Morrison

School/Research organisations


The electrical properties of a family of tetragonal tungsten bronze (TTB) materials, Ba6Sc1-xInxNb9O30 (x = 0.25, 0.5, 0.75), which display relaxor properties were characterised using high-temperature impedance spectroscopy and low-temperature dielectric spectroscopy. All powders were synthesized at 1250°C (24hours) + 1350°C (6.5hours), while the pellets were further sintered at 1350°C (12hours). At high temperature, the electrical conductivity in all samples is dominated by a single response, attributed to the bulk response, while the subtle asymmetry of the imaginary impedance peak suggests a minor contribution of the grain boundary response. In general, the Sc-In solid solutions samples exhibit similar electrical behaviour to the Sc compound, x = 1 reported previously (Ceram. Int. 2016, 42, 11810–11821). At low temperature all compounds exhibit frequency dependent relaxor behaviour. With increasing the content of In, the dielectric peaks are more asymmetric and the curves flatten more at temperatures above the transition temperature. The dipole freezing temperature, TVF, determined by Vogel-Fulcher (VF) analysis does not simply increases linearly as a function of M3+ (Sc3+,In3+) cation size, the extrapolation of VF-like curves results in considerably different values when compared to those found previously, since the acquired dielectric data are very sensitive to preparative conditions.


Original languageEnglish
Pages (from-to)2710-2718
Number of pages9
JournalCeramics International
Issue number2, Part B
Early online date20 Sep 2018
Publication statusPublished - 1 Feb 2019

    Research areas

  • Electrical conduction, Microstructure, Relaxor behaviour, Tetragonal tungsten bronzes, Vogel-Fulcher analysis

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. An electronically driven improper ferroelectric: tungsten bronzes as microstructural analogs for the hexagonal manganites

    McNulty, J. A., Tran, T. T., Halasyamani, P. S., McCartan, S., MacLaren, I., Gibbs, A., Lim, F., Turner, P., Gregg, J. M., Lightfoot, P. & Morrison, F. D., 4 Oct 2019, In : Advanced Materials. 31, 40, 9 p., 1903620.

    Research output: Contribution to journalArticle

  2. Phonon-glass and heterogeneous electrical transport in A-site-deficient SrTiO3

    Popuri, S. R., Decourt, R., McNulty, J. A., Pollet, M., Fortes, A. D., Morrison, F. D., Senn, M. S. & Bos, J. W. G., 7 Mar 2019, In : Journal of Physical Chemistry C. 123, 9, p. 5198-5208 11 p.

    Research output: Contribution to journalArticle

  3. Electrical studies of Barkhausen switching noise in ferroelectric PZT: critical exponents and temperature dependence

    Tan, C. D., Flannigan, C., Gardner, J., Morrison, F. D., Salje, E. K. H. & Scott, J. F., 6 Mar 2019, In : Physical Review Materials. 3, 3, 6 p., 034402.

    Research output: Contribution to journalArticle

Related by journal

  1. Multifunctional behavior of acceptor-cation substitution at higher doping concentration in PZT ceramics

    Kumari, N., Monga, S., Arif, M., Sharma, N., Sanger, A., Singh, A., Vilarinho, P. M., Gupta, V., Sreenivas, K., Katiyar, R. S. & Scott, J. F., 27 Mar 2019, In : Ceramics International. 45, 10, p. 12716-12726

    Research output: Contribution to journalArticle

  2. Characteristics of Ba(Zr0.1Ce0.7Y0.2)O3-δ nano-powders synthesized by different wet-chemical methods for solid oxide fuel cells

    Min, S. H., Lee, J. G., Jeon, O. S., Park, M. G., Ryu, K. H., Myung, J. & Shul, Y-G., Jan 2018, In : Ceramics International. 44, 1, p. 433-437

    Research output: Contribution to journalArticle

  3. One-step fabrication of surface-decorated inorganic nanowires via single-nozzle electrospinning

    Lee, J. G., Jeon, O. S., Myung, J. & Shul, Y. G., 3 Apr 2018, In : Ceramics International. In press

    Research output: Contribution to journalArticle

  4. Preface: Thermophysical Aspects of Functional Materials and Surfaces (TAFCS)

    Rotaru, A., Morrison, F. D. & Tiginyanu, I., 16 Oct 2018, In : Ceramics International.

    Research output: Contribution to journalEditorial

ID: 255998132