| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
Electrical and Dielectric Behaviour of Li-substituted Potassium Sodium Niobate System |
| Author(s) |
Maryam Azadeh, Till Froemling, Ze Xu, Yixuan Liu, Ke Wang |
| On-Site Speaker (Planned) |
Maryam Azadeh |
| Abstract Scope |
Lead-free Potassium sodium niobate ceramics have been surveyed for the past 70 years because of their excellent ferroelectric properties. However, the defect chemistry of KNN has not been extensively discussed. In this study, for Li-substituted KNN, we have performed an investigation combining microstructural, electrical and electromechanical characterizations to correlate the structure-property. (Na0.52K0.48)NbO3-xLiNbO3 x=0 - 0.8 ceramic powders were obtained by solid-state synthesis route. It is observed that the primary phase is crystallized in the perovskite structure. Besides, to elucidate the electronic behaviour of ceramics, impedance and capacitance have been obtained using conventional impedance spectroscopy at a temperature range of 100-600 °C. The alteration of AC conductivity in response to frequency unveils an Arrhenius-type conductivity behaviour, resulting in activation energy of 0.4–1.6 eV, correlated with single-ionized and doubly-ionized oxygen vacancies. Impedance spectroscopy results in conjunction with ferroelectric properties measurements helped define the defect chemistry and Li role on KNN material systems. |