Ferroelectric phase transitions studies in 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 ceramics

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Silva, JPB (Author) Other; Queiros, EC (Author) Other; Tavares, PB (Author) Other; Sekhar, KC (Author) Other; Kamakshi, K (Author) Other; Agostinho Moreira, JA (Author) FCUP; Almeida, A (Author) FCUP; Pereira, M (Author) Other; Gomes, MJM (Author) Other

Journal

Title: Journal of Electroceramics

Vol. 35

Pages: 135-140

ISSN: 1385-3449

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 31 Citations

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-00G-W9F

DOI: 10.1007/s10832-015-0005-y

Abstract (EN): The ferroelectric phase transitions in 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 (BCZT 50/50) ceramics, fabricated by a solid state reaction, were studied by using X-Ray diffraction, Raman spectroscopy, and measuring electric polarization, dielectric permittivity and pyroelectric current. X-ray diffraction (XRD) confirms the coexistence of tetragonal (T) and rhombohedral (R) phases at room temperature. The temperature dependence of the Raman modes frequency reveals the existence of two phase transitions corresponding to the rhombohedral - tetragonal, and tetragonal - cubic close to 30 and 100 A degrees C, respectively. The temperature dependence of electric polarization, pyroelectric current, and dielectric permittivity further supports the ferroelectric (tetragonal) to paraelectric (cubic) phase transition. Moreover, the dielectric permittivity reveals the diffuseness of the phase transition and is attributed to the compositional fluctuations of different polar micro-regions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6