Article ID Journal Published Year Pages File Type
1605468 Journal of Alloys and Compounds 2016 10 Pages PDF
Abstract

•We studied new ceramics compositions.•Dielectric measurements have been confirmed by DSC.•Raman Analysis confirms our dielectric results.

We have studied CaxSryBa1−(y+x)Nb2O6 (CSBN(x)) ceramics with tungsten-bronze structure. Ceramics were prepared with the conventional solid-state reaction for (x = 0.1, y = 0.1), (x = 0.1, y = 0.2) and (x = 0.2, y = 0.1). Phase purity, structure and crystallinity were investigated with X-ray diffraction showing pure phases with tetragonal symmetries. Microstructural analysis was performed using SEM. The microstructure of CSBN(x) ceramics showed a variation in grain shape and size. Dielectric measurements indicated the presence of ferroelectric-paraelectric phase transition at high temperatures which has been confirmed by DSC analyses. Polarizations versus electric field (P-E) loops were measured at different temperature. The Raman spectra of CSBN(x) as a function of temperature were also recorded in order to investigate the phase transformation. The vibrational spectra of CSBN(x) ceramics are dominated by broad and multi-component bands related to the internal vibrations of the NbO6 octahedral.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, , ,