Role of cadmium on the phase transitions and electrical properties of BaTiO3 ceramics
| Autor: | Ruihao Yuan, Xiangdong Ding, Dezhen Xue, Jun Sun, Deqing Xue, Turab Lookman, Yumei Zhou, Prasanna V. Balachandran |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Phase transition Materials science Process Chemistry and Technology Doping Analytical chemistry Nanotechnology 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Tetragonal crystal system Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Phase diagram |
| Zdroj: | Ceramics International. 43:1114-1120 |
| ISSN: | 0272-8842 |
| Popis: | The search for high piezoelectric and electromechanical properties near morphotropic phase boundaries (MPB) in lead-free ceramics has attracted considerable interest. The MPB can be obtained in the composition-temperature phase diagram by combining stabilized rhombohedral (R) and tetragonal (T) ends, which possess cubic (C) to R or C to T transitions, respectively. The R-end is usually realized by doping ions Zr 4 + , Hf 4 + or Sn 4 + at the Ti 4 + site, whereas the T-end can be generated by Ca 2 + doped at the Ba 2 + site of BaTiO 3 . Our recent computational work (Phys. Rev. B. 93, 144111, 2016) showed that Cd 2 + doped BaTiO 3 can be considered as a potential T-end. In the present study, we synthesized ( Ba 1 − x Cd x ) TiO 3 ceramics to investigate the effects of Cd 2 + on the phase transition, dielectric, ferroelectric and piezoelectric properties of the ceramics. Although our results show that Cd 2 + fails to stabilize the T phase, i.e., the transition temperatures vary little with Cd 2 + concentration, the electrical properties are found to be optimized for Cd 2 + % of 5%. The optimization of the properties is related to the microstructural features including grain size and sample density. |
| Databáze: | OpenAIRE |
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