Formation of Morphotropic Phase Boundary and Electrical Properties of (Bi1/2Na1/2)TiO3–Ba(Al1/2Nb1/2)O3 Solid Solution Ceramics

概要

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The phase relations and electrical properties of ($1-x$)(Bi1/2Na1/2)TiO3–$x$Ba(Al1/2Nb1/2)O3 (abbreviated as BNT–BAN100$x$) ceramics were investigated in detail. The morphotropic phase boundary (MPB) between the rhombohedral ferroelectric and pseudocubic (tetragonal) relaxor phases of BNT–BAN100$x$ was determined at approximately $x=0.055$. A maximum piezoelectric constant $d_{33}$ of 133 pC/N was obtained at $x=0.05$ and a normalized strain $d_{33}{}^{*}$ of 533 pm/V was obtained at $x=0.055$. This study revealed that the double-like hysteresis loops and large strain observed near the MPB composition are attributed to the 71 and 109° domain switchings and the switching back attributed to the pseudocubic $\leftrightarrow$ rhombohedral phase transition. This study also showed the relationship between MPB position and the tolerance factor of the end member ABO3 for ($1-x$)BNT–$x$ABO3 solid solution systems. This indicates that the approximate MPB composition of BNT-based solid solutions can be predicted from the tolerance factors of their end members.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-09-25