Abstract
Barium titanate (BaTiO3) nanoparticles were prepared by wet chemical method using commercially available materials barium chloride, titanium dioxide and oxalic acid. Nano scale thin films of different thickness were coated on pre - cleaned glass substrate by using vacuum evaporation technique under a vacuum of 2x10-5 Torr. The X - ray analysis showed that the particles have tetragonal structure. The deposited films of a lower thickness were found to be amorphous in nature, whereas the crystallinity increases with increase of thickness. The estimated value of grain size (D), strain and dislocation density (δ) were also reported in this paper.
Highlights
The discovery of ferroelectric barium titanate (BaTiO3) opens the present era of ceramic dielectric materials
Barium titanate (BaTiO3) nanoparticles were prepared by wet chemical method using commercially available materials barium chloride, titanium dioxide and oxalic acid
We have reported about the preparation of nanoscale BaTiO3 thin films by thermal evaporation technique from BaTiO3 nanoparticles synthesised by wet chemical method
Summary
The discovery of ferroelectric barium titanate (BaTiO3) opens the present era of ceramic dielectric materials. BaTiO3 ceramics have a strong piezoelectric effect. These ceramics find wide applications in devices such as microphones, ultrasonic and underwater transducers, sensors and actuators, electro – optic device, multilayer capacitors and spark generators. BaTiO3 is one of the ABO3 type (A = mono or divalent, B = tri-hexavalent ions) ceramic materials which have been examined in search of ferroelectric applications. In addition to that different techniques have been applied to prepare thin film of barium titanate such as r.f.- sputtering (Bhattacharya et al, 1993), pulsed laser ablation (Yoon et al, 1995) and metal-organic chemical vapour deposition (Tahan et al, 1996)
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