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Thickness dependence on structural, dielectric and AC conduction studies of vacuum evaporated Sr doped BaTiO3 thin films

Raja, Sengodan; Bellan, Chandar Shekar; Sundaram, Senthilarasu; subramani, Gopal; Rajamani, Ranjithkumar

Authors

Sengodan Raja

Chandar Shekar Bellan

Gopal subramani

Ranjithkumar Rajamani



Abstract

Barium titanate (BaTiO3) doped with Strontium (BST) nanoparticles prepared by using wet chemical method were thermally evaporated on to well cleaned glass substrates under the vacuum of 2 × 10−5 Torr, using 12A4 Hind Hivac coating unit. The thickness of the film was measured by quartz crystal monitor. From X-ray analysis, it has been found that BaTiO3 nanoparticles possess tetragonal structure and deposited films has a polycrystalline in nature, whereas the crystallinity of film increases with increase of temperature. Surface morphology of the prepared thin film was found to be uniform. The transport mechanism in these films under a.c. fields was studied in the frequency range 12 Hz to 100 kHz, at different temperatures (303–483 K). The dependence of dielectric constant and loss factor for different thickness was investigated and results are discussed. The process of a.c. conduction has been explained on the basis of hopping conduction mechanism. The dielectric constant (ɛ′), temperature co-efficient of capacitance (TCC) and temperature co-efficient of permitivity (TCP) were estimated. The dependence of activation energy on thickness also studied and reported.

Journal Article Type Article
Acceptance Date Dec 11, 2015
Online Publication Date Dec 23, 2015
Publication Date 2016-03
Deposit Date Mar 14, 2023
Print ISSN 0030-4026
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 127
Issue 6
Pages 3200-3205
DOI https://doi.org/10.1016/j.ijleo.2015.12.072
Keywords Barium strontium titanate, Thermal evaporation, XRD, SEM, TEM