材料科学
热电性
铋
铁电性
陶瓷
热电晶体
图层(电子)
铁电陶瓷
光电子学
电介质
复合材料
冶金
作者
Tadashi Takenaka,Koichiro Sakata
出处
期刊:Ferroelectrics
[Informa]
日期:1991-06-01
卷期号:118 (1): 123-133
被引量:15
标识
DOI:10.1080/00150199108014753
摘要
Abstract Pyroelectric properties of a bismuth layer-structured ferroelectric (BLSF) family are studied on ordinarily fired (OF) (nonoriented) and grain-oriented ceramics for pyrosensor materials. The pyroelectric figure of merit, Fv and FD , are evaluated from the measured values of the pyroelectric coefficient, p, the dielectric constant, e = e33 T/e0, and the loss tangent, tan δ. Infrared frequency response measurements give the voltage responsivity, R v, and the detectivity, D* , for infrared sensing figure of merits, which are related with the Fv and FD , respectively. The grain orientation effects using the hot-forging (HF) method enhance the pyroelectric properties by two or more times those of nonoriented (OF) ones. The Mn-doped and grain-oriented (HF) (Na1/2 Bi1/2)1-xCaxBi4Ti4O15[NCBT] ceramics with a lower free permittivity, e33 T/e0(= ∼130), a higher electromechanical coupling factor, k 33(= 33 ∼ 40%) and a higher anisotropy, k 33/k 31(= 13 ∼ 17) have a comparable value of Fv and D* to that of P...
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