Crystal Structure and Electrical Properties of (1-x) (Ba0.85Sr0.15)TiO3 - x(K0.5Na0.5)NbO3 System
| Autor: | Yhuanita Nurul Kaukaba, Umi Nuraini, Suasmoro, Mashuri |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Crystallography Materials science Mechanics of Materials Mechanical Engineering 0103 physical sciences General Materials Science 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 0210 nano-technology Condensed Matter Physics 01 natural sciences |
| Zdroj: | Materials Science Forum. 966:8-13 |
| ISSN: | 1662-9752 |
| Popis: | The composition of (1-x) (Ba0.85Sr0.15)TiO3 – x (K0.5Na0.5)NbO3 (BST-KNN) for x=0.1 and x=0.2 were successfully prepared by two separate synthesis namely oxalate co-precipitation (for BST) and solid-state reaction (for KNN). Sintered pellet at 1200 °C for 2h exhibits a single phase except x= 0.2 showing a secondary phase and was identified as Ba2TiO4. KNN doped BST system show tetragonal symmetry in which higher dopant expand its tetragonality (c/a). The density of sintered samples deduced by Archimedes method are slightly higher than 90%. Permittivity measurements as function of temperature show almost similar Tc= 90 °C at frequency 1.273 kHz and shift to higher temperature as frequency increases indicating a typical relaxor characteristics. At room temperature the relative permittivity showing Debye relaxation characteristic with ωr=12560 (x=0.1) and ωr =20096 (x-0.2). Furthermore, as function of temperature the activation energy deduced from relaxation time was obtained Ea=0,564 eV for x=0.1 and 0,58 eV for x=0.2. |
| Databáze: | OpenAIRE |
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