Dielectric characterization of microwave sintered lead zirconate titanate ceramics

Author(s)

Goncalves, Mayra D. ; Souza, Flavio L. ; Longo, Elson ; Leite, Edson R. ; Camargo, Emerson R.

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 42, n. 13, p. 14423-14430, OCT 2016.
• Web of Science Citations: 6

Abstract

Highly reactive lead zirconate titanate powders (PZT) with different compositions were successfully synthesized by the oxidant-peroxo method (OPM) and used to prepare dense ceramic samples with composition near to the morphotropic phase boundary (MPB) sintered at 1000 degrees C for 2 h using a tubular conventional oven and a commercial microwave system. Crystalline phases were identified in the powder and ceramic samples by X-ray powder diffraction and FT-Raman spectroscopy at room temperature. The fractured surface of the ceramic sample showed a high degree of densification with fairly uniform grain sizes. Dielectric constants measured in the range from 30 to 500 degrees C at different frequencies (1,10 and 100 kHz) indicated a normal ferroelectric behavior regardless of the sintering method. Samples sintered by a microwave radiation (MW) method and composition near to the MPB region showed a maximum dielectric constant of 17.911 and an anomalous high Curie temperature of 465 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• FAPESP's process: 09/01587-0 - Synthesis by means of the OPM route of PZT perovskites modified with rare-earth and their characterization using Raman, X ray diffraction and electronic microscopies.
• Grantee: Mayra Dancini Gonçalves
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC