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From Ferroelectric to Quantum Paraelectric: KTa1-xNbxO3 (KTN), a Model System

Published online by Cambridge University Press:  01 February 2011

George A. Samara
George A. Samara*
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185-1421
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Abstract

The ABO3 perovskite oxides constitute an important family of technologically important ferroelectrics whose relatively simple chemical and crystallographic structures have contributed significantly to our understanding of ferroelectricity. They readily undergo structural phase transitions involving both polar and non-polar distortions from the ideal cubic lattice. This paper focuses on the mixed perovskite system KTa1-xNbxO3, or KTN, which has turned out to be a model system. While the end members KTaO3 and KNbO3 might be expected to be similar, in reality they exhibit very different properties. Their mixed crystals, which can be grown over the whole composition range, exhibit a rich set of phenomena whose study has added greatly to our current understanding of the phase transitions and dielectric properties of these materials. Included among these phenomena are soft mode response, ferroelectric (FE)-to-relaxor (R) crossover, quantum mechanical suppression of the transition, the appearance of a quantum paraelectric state and relaxational effects associated with dipolar impurities. Each of these phenomena is discussed briefly and illustrated. Some emphasis is on the unique role of pressure in elucidating the physics involved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D8.7
Copyright
Copyright © Materials Research Society 2002

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References

1. Lines, M.E. and Glass, A.M., Principles and Applications of Ferroelectrics and Related Materials, Clarendon Press, Oxford (1977).Google Scholar
2. Samara, G. A. and Peercy, P.S. in Solid State Physics, edited by Ehrenreich, H., Seitz, F. and Turnbull, D., Vol. 36, p. 1, Academic Press, NY (1981) and references therein.Google Scholar
3. Shirane, G., Newnham, R. and Pepinski, R., Phys. Rev. 96, 581 (1954).Google Scholar
4. Cohen, R. E., J. Phys. Chem. Solids 61, 139 (2000) and references therein.Google Scholar
5. Yu, R. and Krakauer, H., Phys. Rev. Lett. 74, 4067 (1995).Google Scholar
6. Singh, D. J., Phys. Rev. B 52, 12559 (1995); B 53 (1996).Google Scholar
7.Based on the early work of Triebwasser, S., Phys. Rev. 114, 63 (1959) and more recent work reviewed in Ref. 8.Google Scholar
8. Samara, G. A. in Solid State Physics, edited by Ehrenreich, H. and Spaepen, F., Academic Press (2001), Vol. 56, Chapter 3, p. 239 and references therein.Google Scholar
9. Samara, G. A. and Boatner, L. A., Phys. Rev. B 61, 1 (2000) and references therein.Google Scholar
10. Samara, G. A., Physica B 150, 179 (1988).Google Scholar
11. Rytz, D., Hochli, U. T. and Biltz, H., Phys. Rev. B 22, 359 (1980).Google Scholar
12. Bykov, I. P., Geifman, I. N., Glinchuk, M. D., and Krulikovskii, B. K., Fiz. Tverd. Tela (Leningrad) 22, 2144 (1980) [Sov. Phys. Solid State 22, 1248 (1980); 27, 1908 (1985) [27, 1149 (1985)].Google Scholar
13. Laguta, V. V. et al, Phys. Rev. B 61, 3897 (2000)Google Scholar
14. Laulicht, I, Yacobi, Y. and Baram, A., J. Chem. Phys. 91, 79 (1989).Google Scholar
15. Leung, K., Phys. Rev. B 63, 134415–1 (2001).Google Scholar