Nano Archive

Synthesis, characterization and dielectric properties of europium-doped barium titanate nanopowders

Rath, M. K. and Pradhan, G. K. and Pandey, B and Verma, H. C. and Roul, B. K. and Anand, S (2008) Synthesis, characterization and dielectric properties of europium-doped barium titanate nanopowders. Materials Letters, 62 (14). 2136 - 2139.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.sciencedirect.com/science/article/B6TX9...

Abstract

Europium-doped cubic barium titanate (BT) nanocrystals with % [Eu/Ti] mol ratio varying from 0.05 to 0.25 were prepared through hydrothermal route. The nano nature of these powders was confirmed by XRD and TEM studies. Pellets were prepared after calcining the powders at 1000 °C for 2 h. These pellets were annealed at 200, 500, 700 and 1000 °C for 2 h at each temperature and used for dielectric measurements. Raman spectra of two typical pellets with %[Eu/Ti] Eu/Ti mol ratios of 0.15 and 0.25 showed all the peaks characteristic of tetragonal BaTiO3. Pure BT showed a low dielectric constant (DC) with a value of 398. Doping with small amounts of Eu resulted in many fold increase of DC values. A maximum value of 10576 at 1 KHz frequency was observed for the sample with % [Eu/Ti] mol ratio of 0.15. Lowering of Curie temperature Tc (95 to 110 °C) was observed for pure as well as Eu-doped barium titanate.

Item Type:Article
Uncontrolled Keywords:Barium titanate; Dielectrics; Perovskite; Europium; Curie temperature
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:6655
Deposited By:SPI
Deposited On:10 Feb 2010 09:01
Last Modified:10 Feb 2010 09:01

Repository Staff Only: item control page