Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na1/2Bi1/2V1–xTixO3 Piezoceramics,ACS Applied Materials & Interfaces

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Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na1/2Bi1/2V1–xTixO3 Piezoceramics
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-21 , DOI: 10.1021/acsami.0c18482
Zhao Pan ₁ , Mao-Hua Zhang ₂ , Takumi Nishikubo ₁ , Yuki Sakai _{1,

3} , Hajime Yamamoto ₄ , Hajime Hojo ₅ , Masayuki Fukuda ₁ , Lei Hu ₁ , Hayato Ishizaki ₁ , Satoru Kaneko ₃ , Shogo Kawaguchi ₆ , Jurij Koruza ₂ , Jürgen Rödel _{2,

7} , Masaki Azuma _{1,

3}

Affiliation

In this work, we show that polarization rotation enhances the piezoresponse in a high-performance lead-free piezoelectric material, Na_1/2Bi_1/2V_1–xTi_xO₃, a solid solution between tetragonal Na_1/2Bi_1/2VO₃ and rhombohedral Na_1/2Bi_1/2TiO₃, obtained by high-pressure synthesis. The system forms a pure perovskite structure with a favorable morphotropic phase boundary (MPB) located around x = 0.90, which separates the tetragonal and rhombohedral phases. In addition, a distinct monoclinic phase with polarization rotation as functions of composition and temperature is observed. XRD measurements revealed the moderately high Curie temperature of 523 K at x = 0.95 in the MPB. The piezoelectric coefficient d₃₃ of the monoclinic x = 0.95 sample, 42 pC/N, is higher than those of the tetragonal and rhombohedral phases. Even though the present lead-free Na_1/2Bi_1/2V_1–xTi_xO₃ ceramics feature smaller d₃₃ values compared to many currently available lead-free piezoelectric materials as a result of insufficient poling and low density, we expect our findings open up opportunities for exploring promising lead-free piezoelectric materials in Na_1/2Bi_1/2VO₃-based perovskites.

中文翻译：

新型无铅Na _1/2 Bi _1/2 V _{1– x} Ti _x O ₃压电陶瓷在各向异性相边界处的极化旋转

在这项工作中，我们证明了极化旋转增强了高性能无铅压电材料Na _1/2 Bi _1/2 V _{1– x} Ti _x O ₃（四方Na _1/2 Bi之间的固溶体）的压电响应。通过高压合成获得的_1/2 VO ₃和菱形Na _1/2 Bi _1/2 TiO ₃。该系统形成纯钙钛矿结构，并在x周围具有良好的同素相界（MPB）。= 0.90，它将四方和菱面体相分离。另外，观察到明显的单斜晶相，其极化旋转是组成和温度的函数。XRD测量显示MPB中x = 0.95时居里温度为523K。单斜晶x = 0.95样品的压电系数d ₃₃为42 pC / N，高于四方相和菱面体相。即使目前的无铅Na _1/2 Bi _1/2 V _1–_x Ti _x O ₃陶瓷具有较小的d ₃₃由于极化不足和低密度，与目前许多可用的无铅压电材料相比，我们希望获得更高的数值，我们希望我们的发现为探索基于Na _1/2 Bi _1/2 VO ₃的钙钛矿中有前景的无铅压电材料提供了机会。

更新日期：2021-02-03

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