Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8147613 | Current Applied Physics | 2018 | 17 Pages |
Abstract
Effects of annealing temperature (600-750â¯Â°C) on crystalline structure, the morphology and piezoresponse hysteresis loops of BaTiO3 nanofibers prepared by electrospinning are characterized by X-ray diffraction, scanning electronic microscopy, transmission electron microscope and piezoresponse force microscope. When the annealing temperature is 700â¯Â°C, the nanofibers become smoother and have a diameter of 100-300â¯nm. Meanwhile the typical butterfly-shaped amplitude loop and 180°phase change represents the best ferroelectric and piezoelectric properties at 700â¯Â°C. So the 700â¯Â°C was found to be optimum for good piezoelectric characteristics at annealing temperature of 600â¯Â°C-750â¯Â°C. In order to give more clear evolution of domain states at different external fields, the three dimensional topographic and phase images of the nanofiber at different temperatures are observed by piezoresponse force microscope. The 90° domain switching is observed during heating from room temperature to 125â¯Â°C and the domain switching tends to be stable when the temperature exceeds a critical value. The thermal stress due to the high temperatures is responsible for switching mechanism from the perspective of equilibrium state free energy. This work suggests that the temperature variation should be considered while designing the ferroelectric devices based on one dimensional material.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Zhe Zhu, Weiming Zhu,