A perovskite ceramic of composition Ba_0.92Ca_0.08(Ti_0.75Zr_0.25)O₃ with both ferroelectric and relaxor properties

Abstract

Dielectric, pyroelectric current and X-ray diffraction studies have been performed on a ceramic of composition Ba_0.92Ca_0.08(Ti_0.75Zr_0.25)O₃ belonging to the BaTiO₃–BaZrO₃–CaTiO₃ ternary diagram. A spontaneous classical ferroelectric–relaxor transition was evidenced at T = 210 K. Such behaviour has been reported previously in other perovskite relaxors (PSN, PST, …). This lead-free ceramic is suitable for dielectric applications in capacitors and actuators because it is environmentally friendly.

References

1. L. E. Cross, Ferroelectrics, 1994, 151, 305.
2. J. Ravez and A. Simon, Phys. Stat. Solidi, 1997, 159, 517.
3. J. Ravez and A. Simon, C. R. Acad. Sci., 1997, 325, 481.
4. J. Ravez and A. Simon, Eur. J. Solid State Inorg. Chem., 1997, 34, 1199.
5. J. Ravez and A. Simon, J. Korean Phys. Soc., 1998, 32, 955.
6. J. Ravez and A. Simon, Mater. Lett., 1998, 36, 81.
7. J. Ravez, C. Broustera and A. Simon, J. Mater. Chem., 1999, 1609.
8. F. Chu, I. M. Reany and N. Setter, Ferroelectrics, 1994, 151, 343.
9. F. Chu, I. M. Reany and N. Setter, J. Appl. Phys., 1995, 77, 1671.
10. C. Malibert, B. Dkhil, J. M. Kiat, D. Durand, J. F. Berar and A. Spasojevic-De Bire, J. Phys.: Condens. Matter., 1997, 9, 7485.
11. P. Hansen, D. Hennings and H. Schreinemacher, J. Am. Ceram. Soc., 1998, 81, 1369.
12. M. El Marssi, R. Fahri and Yu. I. Yuzukuk, J. Phys.: Condens. Matter., 1998, 10, 9161.
13. J. F. Berar, G. Calvarin and D. Weigel, J. Appl. Crystallogr., 1980, 13, 201.
14. J. Ravez, M. Pouchard and P. Hagenmuller, Eur. J. Solid State Inorg. Chem., 1991, 28, 1107.
15. T. Mitsui and W. B. Westphal, Phys. Rev., 1961, 124, 1354.