Dielectric and Magnetic Properties of Nano-structure BaTiO3 Loaded with Sr: Co: Fe Ions; for Different Applications | Chapter 12 | Current Perspective to Physical Science Research Vol. 9

The current work inspiration is to progress the dielectric properties of perovskite nano-structure powder BaTiO3 designated as (BT*) triply-dope by 3 different transition elements (TE) such as; Sr, Fe and Co designated as (TDBTTE*). The following chemical compositions; Ba_0.9Sr_0.1TiO₃, (Ba_(1-x)Sr_xTiO₃,) where (x=0.10) and (Ba _0.9Sr_0.1 Ti_(1-x-y)Fe_xCo_yO₃), where (x=0.1,y=0) and (x=0 and y=0.10 ) and (x=0.5,y=0.5) designated as, (BST*) and (BST10FO*), (BST10CO*) and (BST5F5CO*), respectively were used in the samples preparation, then, heated at constant calcination temperature (CT*) 850oC. For dielectric measurement, the temperature range between 25˚C and 250˚C, respectively, and the dielectric range frequency between 42 Hz and 1 MHz was achieved. There is a sudden decrease in the (ε′) value for (BST*) and a rise in its value for (BST10CO*) and (BST5F5CO*), respectively. However, the addition of Fe³+ and Co²+ ions resulted in an increase in (ε′) of the (BST10FO*), (BST10CO*), and (BST5F5CO*) compared to the (BST*) host material at the same (CT*). These advancements in microstructure and firing density are thought to be connected to these modifications in dielectric characteristics. The (B10ST10C) exhibits the highest relative permittivity (ε') value.

The cited (TDBTTE*), which made by means of the (BT*) and (BST*) candidates as host materials for high-frequency ultrasonic and energy storage applications. A sudden decrease in the dielectric permittivity (DP*) by increasing the frequency range obtained for (TDBTTE*). The adapted sol-gel process (ASGP*) was employed in the sample’s preparation. The transmission electron microscope (TEM*) approves the prepared samples' nano-crystalline phase presence. Moreover, enrichment in the magnetization properties appeared by drawing the magnetic hysteresis loop. An increase in the saturation of the magnetization at room temperature was detected by reducing the crystallite sizes (CS*) of (TDBTTE*) which, we can consider promising candidates for energy storage, electrocaloric and spintronic applications.

Author(s) Details:

I.K. Battisha,
Solid State Physics Department, Physics Research Institute, National Research Centre (NRC), 33 El Behooth St., Dokki, Giza, Egypt and Electric and Dielectric Materials Measurement Unit, National Research Centre (NRC), 33 El Behooth St., Dokki, Giza, Egypt.

 

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