钽酸锂
热电性
纳米复合材料
材料科学
极化(电化学)
钽酸盐
铁电性
氟化物
灵敏度(控制系统)
复合材料
光电子学
化学
铌酸锂
无机化学
电介质
物理化学
工程类
电子工程
作者
S. Satapathy,PK Gupta,K. B. R. Varma
标识
DOI:10.1088/0022-3727/42/5/055402
摘要
We report the ferroelectric and pyroelectric properties of the composite films of lithium tantalate (LT) nanoparticle in poly(vinylidene fluoride) PVDF matrix at different volume fractions of LT (f(LT) = 0.047, 0.09 and 0.17). For an applied electric field of 150 kV cm(-1) the nonvolatile polarization of the composite was observed to increase from 0.014 mu C cm(-2) at f(LT) = 0 to 2.06 mu C cm(-2) at f(LT) = 0.17. For f(LT) = 0.17, the composite films exhibit a saturated ferroelectric hysteresis loop with a remanent polarization (2P(r) = 4.13 mu C cm(-2)). Compared with pure poled PVDF the composite films also showed a factor of about five enhancement in the pyroelectric coefficient at f(LT) = 0.17. When used in energy detection mode the pyroelectric voltage sensitivity of the composite films was found to increase from 3.93 to 18.5 VJ(-1) with an increase in f(LT) from 0.0 to 0.17.
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