Wednesday, December 5, 2012

1212.0366 (Mael Guennou et al.)

High piezoelectric coefficient of single domain Mn-doped NBT-6%BT single

Mael Guennou, Maxim Savinov, Jan Drahokoupil, Haosu Luo, Jirka Hlinka
We report a study of properties of Mn-doped NBT-6%BT single crystals. We show that tetragonal single domain states can be stabilized by poling along a [001] direction. For carefully prepared crystals, the piezoelectric coefficient d33 can reach 570 pC/N, the highest value reported so far for this system. The depolarization temperature is 99{\deg}C. When poled along non-polar directions, the crystals exhibit ferroelectric domain structures consistent with tetragonal micron-sized domains, as revealed by optical observation and Raman spectroscopy. The multidomain crystals have lower d33 values, 225 and 130 pC/N for [011] and [111]-oriented crystals respectively. This trend is consistent with previous reports on undoped NBT-xBT crystals, albeit with an overall increase due to manganese doping, and is commented on from a domain-engineering perspective.
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