Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Abstract

Textured piezoelectric ceramics, such as textured Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics, have attracted considerable attention from both academia and industry, as they possess crystal-like piezoelectric properties, high composition homogeneity, and low manufacturing cost. However, the main difficulty with the textured piezoelectric ceramics is the presence of BaTiO 3 (BT) templates, which greatly reduces their piezoelectricity and phase transition temperature. Thus, it is highly recommended to fabricate textured piezoelectric ceramics using as few templates as possible. Here, we successfully fabricated high-quality <001>-textured PMN-28PT ceramics (texturing degree of 99%) by using an extremely small amount of BT templates (1 vol.%) with the help of CuO/B 2 O 3 sintering aids. The textured PMN-28PT ceramic exhibits 80% piezoelectric coefficient (d 33 ∼ 1200 pC/N), 96% electromechanical coefficient (k 33 ∼ 88%) and the same temperature stability (T rt ∼ 100, T c ∼ 150 • C) when compared to its single crystal counterpart. In addition, by using an alternating current electric field poling (AC-poling), the piezoelectric coefficient d 33 and dielectric permittivity ε 33 of the textured PMN-28PT ceramics were further enhanced around 5-8%. It is believed that the advantages of high electromechanical properties, low cost, and easy mass production of textured PMN-28PT ceramic will make it a promising candidate for advanced electromechanical devices.

Heterostrain-enabled ultrahigh electrostrain in lead-free piezoelectric

“…1 a), the bipolar strain remains in the same direction under a change of direction of the electric field, and its values on both sides are close to each other. This phenomenon of symmetric strain has been widely demonstrated in piezoelectric compounds, such as lead zirconate titanate 17 , barium titanate, bismuth ferrite, potassium sodium niobate 18 , Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) 19 , 20 , Sr 0.35 Na 0.25 Bi 0.35 TiO 3 (SBNT) 21 , etc. When a considerable number of dopants are introduced in the Na 0.5 Bi 0.5 TiO 3 (BNT) lattice, a strain curve with asymmetric loops (Fig.…”

Texture technique to achieve enhanced piezoelectric response in BiScO3–PbTiO3 high-temperature piezoelectric ceramics

“…This notable enhancement can also be attributed to the [001] c grain orientation present in the textured samples. 30 As the temperature increases, the d 31 values of all ceramics exhibit a gradual rise, reaching their peak near a crucial temperature commonly known as the depolarization temperature ( T d ). The textured ceramics with 2BT attain their highest value of d 31 of ∼644 pC N −1 at around 372 °C, whereas the untextured ceramics with 0BT achieve their peak ( d 31 ∼ 513 pC N −1 ) at 402 °C.…”

Physics-embedded machine learning search for Sm-doped PMN-PT piezoelectric ceramics with high performance

“…[4] Among them, Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) piezoelectric ceramics, which have excellent piezoelectric properties, are the focus of current research. [5][6][7] Recently, a large number of theoretical and experimental investigations have been carried out mostly on piezoelectric coefficients in order to expand the range of potential applications. To the best of our knowledge, there are two underlying mechanisms in theory that play important roles in determining the piezoelectric coefficient.…”