Polarization Profiling of Ferroelectrics by Thermal Square Wave Methods

Abstract

In this work, we have used the TSWM method (thermal square wave method at single-frequency) for determining the polarization profile of doped Sr _0.61 Ba _0.39 Nb ₂ O ₆ (SBN) crystals. In particular, Rh, Eu and Cr doping of SBN was studied in detail. It was shown that doping favors a more homogeneous polarization distribution. This was attributed either to the promotion of a more uniform poling by dopants or to a suppression of space charge formation near the surface.

Keywords:

• Ferroelectric ceramics
• thermal wave method
• pyroelectric coefficient profile

PACS:

• 65.40.-b
• 77.70.+a
• 77.84.-s
• 81.05.Je
• 84.37.+q
• 85.50.-n

Acknowledgments

This work was supported by the German Research Foundation (DFG) as part of the Research Group FOR 520, and by Grants RNP 2.1.1.3674 and RNP 2.2.2.3.10101 of the Ministry of Education and Science of the Russian Federation.