Microstructural characterization and dielectric properties of single crystalline BaTi2O5 nanowires prepared by molten-salt method

Autor: Zhipeng Pei, Xinhua Zhu, Weiren Xia, Yao Lu, Kai Leng, Xianzhuo Wang, Heng Wu
Rok vydání: 2019
Předmět:
Zdroj: SN Applied Sciences. 1
ISSN: 2523-3971
2523-3963
DOI: 10.1007/s42452-019-0553-x
Popis: BaTi2O5 (BT2) nanowires were successfully prepared via molten-salt method. The effects of synthesized temperature, dwell time, and molten salt concentration on the formation of BT2 nanowires were studied. X-ray diffraction patterns reveal that the BT2 nanowires crystallize in a monoclinic crystal structure. Neither the longer dwell time nor molten salt concentration has apparent influence on the formation of BT2 phase structure, whereas the synthesized temperature exerts great effect on the morphology of BT2 nanowires. One-dimensional morphology of the BT2 products was only obtained at a narrow temperature window (870–900 °C). At 970 °C, the morphology of BT2 nanowires was destroyed and they are broken into particles, growing as large flat crystals. The BT2 nanowires synthesized at 900 °C exhibit uniform morphology and grow in the [010] direction, which have an average diameter of 780 nm and length of 15 μm. The formation mechanism of BT2 nanowires in the MSS process is proposed. The BT2 nanowires exhibit the single-crystalline characteristics, as proven by high-resolution TEM images and electron diffraction patterns. Quantitative X-ray energy-dispersive spectroscopy analysis shows the BT2 nanowires having homogeneous chemical compositions, and their atomic cation ratio of Ba:Ti is 1:2.16. Dielectric properties of the BT2 nanowires synthesized at 900 °C are measured at room temperature with the frequency ranged from 102 to 106 Hz. The BT2 nanowires exhibit almost frequency independent dielectric behavior with dielectric constants of 28–31. The dielectric losses remain constant value of ~ 0.02 below 105 Hz, and increase up to 0.04 at 106 Hz.
Databáze: OpenAIRE
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