Department of Electronics and Materials Science, Graduate School of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan.
J Phys Condens Matter. 2013 Oct 23;25(42):425901. doi: 10.1088/0953-8984/25/42/425901. Epub 2013 Oct 1.
We report the phase diagram of (Ba1-xCax)(Zr0.1Ti0.9)O3 solid solution. It is found that substitution of smaller Ca ions for Ba ions can slightly increase the cubic-tetragonal (T) para-ferroelectric phase transition temperature and strongly decrease the T-orthorhombic (O) and O-rhombohedral (R) transition. This unique ferroelectric phase evolution is attributed to Ca off-centering effects. More importantly, lowering of the T-O or O-R phase transitions allows us to prepare the piezoelectric ceramics with a strain response as high as S/E ≈ 800 pm V(-1) (E = 10 kV cm(-1)) over a wide range of compositions with x ≈ 0.1-0.18 at room temperature, which may be interesting for piezoelectric applications.
我们报告了（Ba1-xCax）（Zr0.1Ti0.9）O3 固溶体的相图。研究发现，用较小的 Ca 离子取代 Ba 离子可以略微提高四方-正交（T）铁电相转变温度，而强烈降低 T-正交（O）和 O-三方（R）转变温度。这种独特的铁电相演变归因于 Ca 的非中心对称效应。更重要的是，T-O 或 O-R 相转变的降低使我们能够在室温下通过大范围的 x ≈ 0.1-0.18 组成范围内制备具有高达 S/E ≈ 800 pm V(-1)（E = 10 kV cm(-1)）应变响应的压电陶瓷，这对于压电应用可能很有趣。
