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Structural transformation and high negative dielectric constant behavior in (1-x) (Al0·2La0·8TiO3) + (x) (BiFeO3) (x = 0.2–0.8) nanocomposites
Physica E: Low-dimensional Systems and Nanostructures ( IF 2.9 ) Pub Date : 2020-05-19 , DOI: 10.1016/j.physe.2020.114204
A. Mallikarjuna , S. Ramesh , N. Suresh Kumar , K. Chandra Babu Naidu , K. Venkata Ratnam , H. Manjunatha , B. Parvatheeswara Rao

The (1-x) (Al0·2La0·8TiO3) + (x) (BiFeO3) nanocomposites were synthesized via low temperature hydrothermal method. The X-ray diffraction (XRD) patterns established the tetragonal phases for x = 0.2 while the cubic phases were detected in case of x = 0.4, 0.6 & 0.8 composites. The surface morphology was analysed using field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The results indicated that there was a clear formation of well-defined spherical grains/particles for x = 0.4 composites. The UV–Visible spectral analysis showed the optical band-gap energy (Eg) increasing from 5.499 to 5.721 eV as a function of ‘x’. In addition, the dielectric properties revealed the negative dielectric constant (ε′) and dielectric loss (ε") parameters between the frequencies 2887 Hz–8 MHz. The data suggested that the ε′ and ε" values were noticed to be −1234 and −248.7, respectively, at 8 MHz. The magnetic hysteresis loop behavior exhibited the paramagnetic nature for x = 0.2–0.8. Moreover, the saturation magnetization (Ms) was determined using the law of approach saturation (LAS) plots. These plots ensured the variation of Ms from 0.0254 ± 0.00132 to 0.194 ± 0.00454 emu/g.



中文翻译:

(1-x)(Al 0·2 La 0·8 TiO 3)+(x)(BiFeO 3)(x = 0.2–0.8)纳米复合材料的结构转变和高负介电常数行为

通过低温水热法合成了(1-x)(Al 0·2 La 0·8 TiO 3)+(x)(BiFeO 3)纳米复合材料。X射线衍射(XRD)图建立了x = 0.2的四方相,而在x = 0.4、0.6和0.8的复合材料中检测到了立方相。使用场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)分析表面形态。结果表明,对于x = 0.4的复合材料,清晰地形成了明确定义的球形晶粒/颗粒。紫外可见光谱分析显示了光学带隙能量(E g)随'x'的变化而从5.499增加到5.721 eV。另外,介电特性显示出在2887 Hz–8 MHz频率之间的负介电常数(ε ')和介电损耗(ε “)参数。数据表明ε ′和ε ”值分别为-1234和在8 MHz时分别为−248.7。磁滞回线表现出x = 0.2–0.8的顺磁性。此外,饱和磁化强度(M s)是根据接近饱和度定律(LAS)曲线确定的。这些图确保了M s从0.0254±0.00132到0.194±0.00454 emu / g的变化。

更新日期:2020-05-19
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