Internal Friction Study of Neodymium-Modified Bismuth Titanate Ceramic

Abstract

Bi_3.15Nd_0.85Ti₃O₁₂ ceramics were prepared using conventional solid state reaction method and their internal frictions were measured. Two IF peak were detected around 453 K and 532 K. The one, appeared at 453 K originates from the migration of oxygen vacancies among those unequal oxygen positions in lattice of ceramics. Another appeared around 532 K, which was far below the Curie point (around 890 K), was ascribed to the interaction between oxygen vacancies and 90° domain walls. These results can be helpful in understanding the fatigue mechanism in ferroelectric materials.

Keywords:

• Ferroelectric fatigue
• internal friction
• oxygen vacancy

ACKNOWLEDGEMENTS

This work was supported by the National Natural Science Foundation under Grant No. 90207027 and the National Key Basic Research and Development Program of China under Grant No. 2002CB613303.