-
- Home
- Journals
- Bulletin of Materials Science
-
K Porsezian
Articles written in Bulletin of Materials Science
-
-
Volume 34 Issue 1 February 2011 pp 121-124
Effect of low level substitution of Sr–Ba on transport and magnetic behaviour of La0.67Ca0.33MnO3
B Munirathinam M Krishnaiah M Manivel Raja S Arumugam K Porsezian
In this paper we report the investigation of transition metal oxide compound, La0.67Ca0.25Sr0.04Ba0.04MnO3 (LCSBMO), along with La0.67Ca0.33MnO3 (LCMO), synthesized by sol–gel route under identical conditions. The effect of simultaneous low level substitution of large size ions such as Sr2+ and Ba2+ for Ca2+ ions on the electronic transport and magnetic susceptibility properties are analysed and compared apart from microstructure and lattice parameters. The temperature dependent electrical transport of the polycrystalline pellets of LCSBMO and LCMO when obeying the well studied law, ρ = ρ0 + ρ2 𝑇2 for 𝑇 < 𝑇MI, is observed to differ by more than 50% from the values of ρ0 and ρ2, with the former compound showing enhanced electrical conductivity than the latter. Similarly in fitting the adiabatic small polaron model for resistivity data of both the samples for 𝑇 > 𝑇MI, the polaron activation energy is found to differ by about 11%. In addition, the temperature dependent a.c. magnetic susceptibility study of the compounds shows a shift of about 6% in the paramagnetic to ferromagnetic transition temperature (285 K for LCSBMO and 270 K for LCMO).
-
-
Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
-
Bulletin of Materials Science | News
-
Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
-