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説明:

We report a non-Pb piezoelectric ceramic system Ba(Ti0.8Zr0.2)O3−(Ba0.7Ca0.3)TiO3 which shows a surprisingly high piezoelectric coefficient of d33∼620  pC/N at optimal composition. Its phase diagram shows a morphortropic phase boundary (MPB) starting from a tricritical triple point of a cubic paraelectric phase (C), ferroelectric rhombohedral (R), and tetragonal (T) phases. The high piezoelectricity of the MPB compositions stems from the composition proximity of the MPB to the tricritical triple point, which leads to a nearly vanishing polarization anisotropy and thus facilitates polarization rotation between ⟨001⟩T and ⟨111⟩R states. We predict that the single-crystal form of the MPB composition of the present system may reach a giant d33=1500–2000  pC/N. Our work may provide a new recipe for designing highly piezoelectric materials (both Pb-free and Pb-containing) by searching MPBs starting from a TCP.

権利情報:

• In Copyright
  

キーワード: piezoelectriic, piezoelectric material, Pb-free piezoelectric, ferroelectric, tri-critical, morphotropic phase boundary, ferroelectric phase transition

刊行年月日: 2009-12-15

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 103 257602

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevlett.103.257602

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更新時刻: 2024-01-05 22:12:06 +0900

MDRでの公開時刻: 2023-06-28 13:53:13 +0900