Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 Lead-Free Incipient Piezoceramic

被引：150

作者：

Acosta, Matias ^{[1
]}

Jo, Wook ^{[1
]}

Roedel, Juergen ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2014年 / 97卷 / 06期

关键词：

DIELECTRIC-PROPERTIES; STRAIN; CERAMICS; TRANSITION;

D O I：

10.1111/jace.12884

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

081705 [工业催化]; 082905 [生物质能源与材料];

摘要：

The dielectric and electromechanical properties of 0.75Bi1/2Na1/2TiO3-0.25 SrTiO3 (25ST) as a function of temperature and frequency were studied. It is shown that the 25ST is a relaxor ferroelectric as evidenced by the temperature-dependent dielectric relaxations with an incipient piezoelectricity featured by the presence of a reversible electric-field-induced phase transformation at room temperature. The transition occurs on a broad electric field strength range depending on field amplitude and frequency. It is also accompanied by a huge strain that is attributed to repetitive poling and depoling originating due to the reversibility of the phase transition. The 25ST makes an attractive lead-free candidate for stack actuators as it presents a high normalized d33* of similar to 600pm/V at a low electric field of 4kV/mm for frequencies ranging from 0.1 up to 100Hz.

引用

页码：1937 / 1943

页数：7

共 59 条

[1]

High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics [J].