The quenched state with dominant shear vibration mode originated from domain reconfiguration in [001]-oriented Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals

Lithium niobate crystals (LiNbO3, LN) are multifunctional crystal materials with many outstanding properties. In this work, the electro-elastic properties of LN single crystals were explored at temperatures from −150 °C to 150 °C. The temperature dependences of dielectric permittivities, elastic compliances, electromechanical coupling factors and piezoelectric coefficients were determined using the impedance method. The LN crystals possessed large dielectric permittivities, the ε11T/ε0 and ε33T/ε0 were 83.2 and 29.4 at room temperature, respectively. The elastic compliances s11, s13, s33 and s44 presented a positive increase as the temperature increased, and the variations were 5.0%, 8.2%, 4.6% and 5.4%, respectively, showing a good temperature stability. Moreover, the temperature dependence of the electromechanical coupling factors and piezoelectric coefficients for different vibration modes were studied with a temperature range from −150 °C to 150 °C, where the thickness shear vibration mode d15 presented a large piezoelectric response and minimal temperature variation.

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High-Power, Multioutput Piezoelectric Transformers Operating at the Thickness-Shear Vibration Mode

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control ◽

10.1109/tuffc.2004.1308686 ◽

2004 ◽

Vol 51 (5) ◽

pp. 502-509

Author(s):

Jinlong Du ◽

Junhui Hu ◽

King Jet Tseng

Keyword(s):

High Power ◽

Vibration Mode ◽

Shear Vibration ◽

Piezoelectric Transformers ◽

Thickness Shear

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A Study on the Disk-Type Piezoelectric Transformer of Mg:LN Single Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.105-106.278 ◽

2010 ◽

Vol 105-106 ◽

pp. 278-281

Author(s):

Ming Fu Zhang ◽

Huai Xin Guo ◽

Hai Liang Zhang ◽

Cheng Hai Xu ◽

Ye Quan Zhao ◽

...

Keyword(s):

Single Crystals ◽

Gold Electrode ◽

Vibration Mode ◽

Equivalent Circuit Model ◽

Input Voltage ◽

Bottom Surface ◽

Outer Diameter ◽

Piezoelectric Transformer ◽

Annular Gap ◽

Step Down

In this study, a disk-shaped step-down piezoelectric transformer that consists of Mg:LN single crystals operating in the extensional vibration mode was proposed, and its characteristics wre investigated. This paper proposed the PT using ring/dot electrode which had an outer diameter of 22 mm, a narrow annular gap circle of 1.0 mm and a thickness of 1.0 mm. The transformer was poled along the thickness direction. The top surface was covered by two ring-shaped electrodes separated by a narrow annular gap, and the regions covered by the outer and inner ring electrodes serve as the output and input parts of the transformer, respectively. The bottom surface was fully covered with a gold electrode. Moreover, according to the physical equivalent circuit model of the latest invented vibration mode, PT of Mg:LN single crystals were fabricated and characterized. Finally, we investigated the gain under different load resistances and input voltage.

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