NDLI: Effect of low level substitution of Sr–Ba on transport and magnetic behaviour of La$_{0·67}$Ca$_{0·33}$MnO$

Content Provider	Springer Nature Link
Author	RAJA, M MANIVEL
Copyright Year	2011
Abstract	In this paper we report the investigation of transition metal oxide compound, La$_{0·67}$Ca$_{0·25}$Sr$_{0·04}$Ba$_{0·04}$MnO$_{3}$ (LCSBMO), along with La$_{0·67}$Ca$_{0·33}$MnO$_{3}$ (LCMO), synthesized by sol–gel route under identical conditions. The effect of simultaneous low level substitution of large size ions such as Sr$^{2+}$ and Ba$^{2 + }$ for Ca$^{2 + }$ 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, $\rho = \rho_{0} + \rho_{2} \;T^{2}$ for T < T $_{ MI }$, is observed to differ by more than 50% from the values of ρ $_{0}$ and ρ $_{2}$, 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 > T $_{ MI }$, 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).
Starting Page	121
Ending Page	124
Page Count	4
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	34
Issue Number	1
e-ISSN	09737669
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-10
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceramic; sol–gel processes; magnetic measurements; electronic transport; X-ray diffraction. Materials Science Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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