Revisiting the phase sequence and properties of K0.5Na0.5NbO3 ceramics sintered by different processes

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Gomes, MM (Author) Other; Vilarinho, R (Author) Other; Pinho, R (Author) Other; Almeida, A (Author) FCUP; Noudem, JG (Author) Other; Costa, MEV (Author) Other; Vilarinho, PM (Author) Other; Agostinho Moreira, JA (Author) FCUP

Journal

Title: Ceramics International

Vol. 47

Pages: 8308-8314

ISSN: 0272-8842

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 6 Citations

Scientific classification

CORDIS: Physical sciences

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-00T-60A

DOI: 10.1016/j.ceramint.2020.11.192

Abstract (EN): In this work, we revisit the phase transition sequence and the effect of the sintering process on the structural, dielectric and polar properties of K0.5Na0.5NbO3 ceramics prepared by conventional sintering, spark plasma sintering and spark plasma texturing. Herein, comparative experimental study of the lattice dynamics, polar and dielectric properties is presented. We observe that the phase transition sequence includes an unreported structural and polar phase at low temperatures, independently on the processing method. Contrarily, we observe apparent changes of the stability temperature interval of the different phases. The dielectric strength and the emergence of a dielectric relaxation phenomenon are also noticeably dependent on the processing method, which can be understood as an effect of the different grain size. The results here reported clearly show the possibility to change physical properties following different sintering routes in order to improve device performance.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7