Piezoelectric and pyroelectric properties of calcium-modified and grain-oriented (NaBi)1/2Bi4Ti4O15 ceramics
Piezoelectric and pyroelectric properties of calcium-modified and grain-oriented (NaBi)1/2Bi4Ti4O15 ceramics
复制标题
钙改性晶粒取向(NaBi)1/2Bi4Ti4O15陶瓷的压电和热释电性能
DOI：
10.1080/00150198908014250
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发表时间：
1989
期刊：
影响因子：
0.8
通讯作者：
K. Sakata
中科院分区：
文献类型：
--
作者：
T. Takenaka;K. Sakata
摘要采用热锻（H. F.）方法研究了铋系层状铁电（BLSF）陶瓷（NaBi）（1-x）/2CaxBi 4 Ti4 O 15（NCBT-100 x）的晶粒取向效应。方法对压电和热释电性能的影响。介电常数ε s很小，在很宽的组成范围内（x = 0 tox = 1）几乎是恒定的。居里温度Tc随着Ca浓度的增加而增加。晶粒取向（H. F.）如果与非定向的相比，这些效应将压电和热电性能提高两倍或更多倍。高频Mn掺杂的NCBT-5陶瓷具有较低的自由介电常数e33 T/e0（= 130）和较高的机电耦合系数k33（= 33 <$40%），沿着较高的各向异性k33/k31（= 13 <$17），是非常有吸引力的高温水听器应用或高频超声换能器的候选材料。热释电特性对传感器材料也很有意义，并且热释电特性的数值与温度有关。
Abstract Grain orientation effects of (NaBi)(l-x)/2Ca x Bi4Ti4O15 (NCBT-100x) ceramics, which belong to a bismuth layer-structured ferroelectric (BLSF) family, are studied using the hot-forging (H.F.) method on the piezoelectric and pyroelectric properties. The dielectric constant e s is small and almost constant at the wide range of composition (x = 0tox = 1). The Curie temperature, Tc , increases as the Ca concentration increases. The grain orientation (H.F.) effects enhance the piezo- and pyroelectric properties by a factor of two or more if compared with non-oriented ones. The H.F. and Mn-doped NCBT-5 ceramics, with a lower free permittivity e33 T/e0 (= ∼ 130) and higher electromechanical coupling factor k 33 (= 33 ∼ 40%), along with a higher anisotropy k 33/k 31 (= 13 ∼ 17), are very attractive candidate materials for hydrophone applications at high temperatures or for high-frequency ultrasonic transducers. Pyroelectric properties are also very interesting for sensor materials, and the figure of meri...