Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na1/2Bi1/2V1- xTi x O3 Piezoceramics

Zhao Pan; Mao-Hua Zhang; Takumi Nishikubo; Yuki Sakai; Hajime Yamamoto; Hajime Hojo; Masayuki Fukuda; Lei Hu; Hayato Ishizaki; Satoru Kaneko; Shogo Kawaguchi; Jurij Koruza; Jürgen Rödel; Masaki Azuma

doi:10.1021/acsami.0c18482

Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na_1/2Bi_1/2V_{1- x}Ti _x O₃ Piezoceramics

ACS Appl Mater Interfaces. 2021 Feb 3;13(4):5208-5215. doi: 10.1021/acsami.0c18482. Epub 2021 Jan 21.

Authors

Zhao Pan¹, Mao-Hua Zhang², Takumi Nishikubo¹, Yuki Sakai^{1

3}, Hajime Yamamoto⁴, Hajime Hojo⁵, Masayuki Fukuda¹, Lei Hu¹, Hayato Ishizaki¹, Satoru Kaneko³, Shogo Kawaguchi⁶, Jurij Koruza², Jürgen Rödel^{2

7}, Masaki Azuma^{1

3}

Affiliations

¹ Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
² Department of Materials and Earth Sciences, Nonmetallic Inorganic Materials, Technical University of Darmstadt, Darmstadt, 64287, Germany.
³ Kanagawa Institute of Industrial Science and Technology (KISTEC), 705-1 Shimoimaizumi, Ebina, Kanagawa 243-0435, Japan.
⁴ Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
⁵ Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan.
⁶ Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyo̅go 679-5198, Japan.
⁷ Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.

PMID: 33475346
DOI: 10.1021/acsami.0c18482

Abstract

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.

Keywords: ferroelectricity; lead-free; perovskite; piezoelectric; polarization rotation.