About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
Presentation Title |
Features on the Structural Phase Transition in La-modified AgNbO3 Lead-free Ceramics |
Author(s) |
Karine Felix Santos de Jesús, Atair Carvalho da Silva, Yanela Mendez-González, Ruyan Guo, Amar S. Bhalla, Jose de los Santos Guerra |
On-Site Speaker (Planned) |
Jose de los Santos Guerra |
Abstract Scope |
Silver niobate (AgNbO3 – AN) based compounds have attracted special attention over the last decade due to their very interesting physical properties, which make them promising materials for practical applications due to the high recoverable energy density and exceptional electromechanical response. Therefore, they have been considered as excellent lead-free alternatives for energy storage and high piezoelectric performance devices. The aim of the present work is to investigate the structural phase transition characteristics of rare-earth modified AN electroceramics. In particular, the influence of the lanthanum content (Ag1–3xLaxNbO3) on the structural properties, investigated from Raman spectroscopy, and the dielectric response have been analyzed, both in a wide temperature range. The observed anomalous behaviors have been analyzed and discussed within the framework of the current phenomenological models found in the literature. The authors thank CNPq (303447/2019-2), FAPEMIG (PPM-00661-16 and APQ-02875-18) and CAPES (Finance Code 001) Brazilian agencies for the financial support. |