Phase transition and dielectric study in Ba0·95Dy0·05TiO3 ceramic

Abstract

Temperature and frequency dependence dielectric permittivity of Ba 0⋅95 Dy 0⋅05 TiO 3 ceramic has been studied in the temperature range of 100-350 K at the frequencies, 1 kHz, 10 kHz, 100 kHz and 1 mHz. Diffuse phase transition and frequency dispersion is observed in the permittivity-vs-temperature plots. This has been attributed to the occurrence of relaxor ferroelectric behaviour. The observed relaxor behaviour has been quantitatively characterized based on phenomenological parameters. A comparison with the Zr doped BaTiO 3 has also been presented. The microstructure of as-sintered samples shows a dense and almost uniform micrograph without any impurity phases; the grains are almost spherical with random orientation.

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

“…This result suggests that Nd 2 NiMnO 6 is a relaxor ferroelectric and its diffuseness increases with increment of frequency. In relaxor materials, relaxation behaviour can also be studied by the experimental Vogel-Fulcher (VF) model [27]. Such type of behaviour occurs due to the thermally activated polarization between two identical variants.…”

Microstructural response of pure copper to cryogenic rolling

“…in the cryogenic range. This approach, known as "cryogenic deformation", has recently been proposed as a means of producing bulk NC materials [4][5][6][7][8][9][10].…”

Quantitative structural analysis, phase transition and relaxor nature of Bi0.5Li0.5TiO3 ceramic prepared by mechanical alloying

“…The diffuse characteristics of ferroelectric-paraelectric phase transition are known to deviate from the typical Curie-Weiss behavior and can be described by a modified Curie-Weiss relationship [33][34],…”