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

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• 作者：Sengodan Raja^a ; Chandar Shekar Bellan^b ; ^{chandar.bellan@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Senthilarasu Sundaram^c ; Gopal subramani^a ; Ranjithkumar Rajamani^d
• 关键词：Barium strontium titanate ; Thermal evaporation ; XRD ; SEM ; TEM
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：127
• 期：6
• 页码：3200-3205
• 全文大小：2387 K

文摘

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.