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

Abstract

<p>In this work, we show that polarization rotation enhances the piezoresponse in a high-performance lead-free piezoelectric material, Na1/2Bi1/2V1-xTixO3, a solid solution between tetragonal Na1/2Bi1/2VO3 and rhombohedral Na1/2Bi1/2TiO3, 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 Na1/2Bi1/2V1-xTixO3 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 Na1/2Bi1/2VO3-based perovskites.</p>

Topics

• density
• perovskite
• impedance spectroscopy
• phase
• x-ray diffraction
• phase boundary
• Curie temperature
• piezoelectric material