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Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al0.2La0.8TiO3) + 0.4 (BiFeO3) Nanocomposite
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2020-05-24 , DOI: 10.1002/crat.202000068
A. Mallikarjuna 1 , Singampalli Ramesh 1 , Nagasamudram Suresh Kumar 2 , Kadiyala Chandra Babu Naidu 1 , K. Venkata Ratnam 3 , H. Manjunatha 3
Affiliation  

A series of nanocomposites with a chemical formula of (1−x ) (Al0.2La0.8TiO3) + x (BiFeO3)/ALTBF is prepared through low temperature hydrothermal method. The tetragonal phases are detected at x = 0.2 and the x = 0.4–0.8 composites show the existence of cubic phases. The transmission electron microscope pictures show the presence of well‐defined spherical particles for all composites. Furthermore, photocatalytic activity is observed for x = 0.2–0.8 composites during time intervals ranging from 0 to 240 min. The x = 0.2, 0.6, and 0.8 nanocomposites reveal the usual behavior of ac‐electrical conductivity (σ ac), dielectric modulus parameters (M ′ and M ″), and impedance parameters (Z ′ and Z ″). However, interestingly, x = 0.4 composite performs the negative values of electrical parameters like σ ac, M ′, M ″, and Z ″. This implies that x = 0.4 composite behaves like a metamaterial possessing negative indexed electrical parameters. Therefore, x = 0.4 composite can be well suited for microwave device applications at high frequency.

中文翻译:

0.6(Al0.2La0.8TiO3)+ 0.4(BiFeO3)纳米复合材料的光催化活性,负交流电导率,介电模量和阻抗特性

通过低温水热法制备了一系列化学式为(1- x)(Al 0.2 La 0.8 TiO 3)+ x(BiFeO 3)/ ALTBF的纳米复合材料。在x = 0.2处检测到四方相,x = 0.4-0.8的复合材料表明存在立方相。透射电子显微镜图片显示所有复合材料均存在定义明确的球形颗粒。此外,在0到240分钟的时间间隔内,x = 0.2-0.8的复合材料具有光催化活性。该X= 0.2,0.6和0.8纳米复合材料揭示交流电导率(通常的行为σ AC),介电模量的参数(中号'和中号“),和阻抗参数(Ž '和Ž ”)。然而,有趣的是,X = 0.4的复合进行电参数等的负值σ交流中号',中号“,和ž ”。这意味着x = 0.4复合材料的行为就像具有负索引电参数的超材料。因此,x = 0.4复合材料非常适合高频下的微波设备应用。
更新日期:2020-07-09
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