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论文类型：期刊论文

发表时间：2009-08-23

发表刊物：FERROELECTRICS

收录刊物：SCIE、EI、Scopus

卷号：402

期号：1

页面范围：79-88

ISSN号：0015-0193

关键字：La1-xSrxFeO3; sol-gel method; dielectric properties; humidity

摘要：In this paper, single-phase nanocrystalline La1-xSrxFeO3 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) with perovskite structure were prepared by employing sol-gel method. XRD and TEM were used to characterize the materials. Dielectric properties of La1-xSrxFeO3 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) were investigated. The experiments were carried out as a function of Sr doping (0.1 x 0.5) and frequency (10-105 Hz) in different relative humidity (RH) at 25 degrees C. The results revealed that capacitance decreased as the frequency increased, and the peaks of dielectric loss appeared at high relative humidity range. Humidity sensing properties were also studied in this work. It was found that La0.7Sr0.3FeO3 exhibited high humidity sensitivity and small hysteresis from 33% RH to 98% RH.