Effect of strontium doping on structural and dielectric behaviour of barium titanate nanoceramics

ABSTRACT

Barium strontium titanate (Ba_(1−x)Sr_xTiO₃ where, x = 0.0, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been successfully synthesised by sol–gel method and characterised thoroughly. With the increase in Sr concentration (x > 0.3), the symmetry of the crystal structure changed from tetragonal to cubic phase. The dielectric behaviour of the ceramic nanoparticles was evaluated using impedance analyser with an operating frequency of 1 Hz to 1 MHz. A very high dielectric constant 4915 was obtained for Ba_0.7Sr_0.3TiO₃ at 1 Hz frequency with low dielectric loss of 1.91, which showed very good value than the one previously reported. The density of the material was found to be >98% of theoretical density. Dielectric constants were measured by varying the temperature from 35 to 150°C and the Curie temperatures were also evaluated. The small amount of Sr doping was beneficial for obtaining high dielectric constant material which can be used in various electronic applications.

KEYWORDS:

• Barium strontium titanate
• nanoparticle
• sol–gel method
• crystal structure
• dielectric constant
• Curie temperature

Acknowledgements

The authors greatly acknowledge the Central Research Facility (C.I.F), Birla Institute of Technology, Mesra, Ranchi, India, and UGC-DAE Consortium for Scientific Research, Indore, India for providing characterisation of the samples.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Barnali Dasgupta Ghosh http://orcid.org/0000-0002-4945-8763

Additional information

Funding

This work was supported by Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India for financial support under the project grant number (SB/FT/CS-194/2013).