Temperature Dependencies of Piezoelectric Coefficients of L-Alanine Doped TGS Crystals

Abstract

The Michelson single beam laser interferometer has been used to study small displacement of LATGS crystals caused by the reciprocal piezoelectric effect. All eight nonzero mutually independent piezoelectric coefficients d iλ have been determined. Values of piezoelectric coefficients d 16 , d 21 , d 22 and d 23 and absolute values of piezoelectric coefficients d 25 and d 34 increase with increasing temperature, piezoelectric coefficients d 14 and d 36 decrease. Measured data was fitted according to a mathematical function similar to the Curie-Weiss law. Obtained results coincide with measurement using the double beam Mach-Zender interferometer at the room temperature.

Designing Artificial Vibration Modes of Piezoelectric Devices Using Programmable, 3D Ordered Structure with Piezoceramic Strain Units

“…What is more, these two artificially constructed modes manifest relatively ultrahigh coefficients (up to 24 000 pm V −1 ), which are hundreds of times larger than those of natural piezoelectric crystals (see Figure 4d,e). [ 41–43 ]…”

“…In particular, it should be noted that the apparent shear piezoelectric coefficients , , and were measured to be as high as 7210, 7374, and 12 818 pm V −1 , respectively, which are all about tenfold bigger than the natural d 15 value (780 pm V −1 ) of this material, and hundreds of times as much as those constants of piezoelectric crystals. [ 41–43 ] The enhanced shear deformations and corresponding apparent shear piezoelectric coefficients of 3D OSPSU came from the strong synergistic strain coupling, leading to local stress concentration effect between units at the interface, and therefore, a large nonlinear shear deformation. At the same time, considering the merits such as no secondary coating of electrodes, no need to worry about polarization switching, low price, and long service time, these three modes could certainly play a significant role in the future advanced piezoelectric devices.…”

“…In particular, it should be noted that the apparent shear piezoelectric coefficients 34 app d , 35 app d , and 36 app d were measured to be as high as 7210, 7374, and 12 818 pm V −1 , respectively, which are all about tenfold bigger than the natural d 15 value (780 pm V −1 ) of this material, and hundreds of times as much as those constants of piezoelectric crystals. [41][42][43] The enhanced shear deformations and corresponding apparent shear piezoelectric coefficients of 3D OSPSU came from the strong synergistic strain Adv. Mater.…”

“…Similarly, the apparent 35 d app value has a negative nonlinear relationship with i, and a positive nonlinear relationship with k. What is more, these two artificially constructed modes manifest relatively ultrahigh coefficients (up to 24 000 pm V −1 ), which are hundreds of times larger than those of natural piezoelectric crystals (see Figure 4d,e). [41][42][43] The d 36 mode also refers to an in-plane shear strain. Its displacement is along 2-axis, and its boundary constraint is on the 2-3 plane, where the constraint area is proportional to j and k. Stacking units along 1-axis can produce the superimposed effect of tangential displacement δ 6 , so the apparent coefficient 36 app d increases significantly as i increases.…”