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Synthesis and properties of some Nd-Sr manganites dopped with indium

M.-L. CRAUS1,2,* , N. CORNEI3

Affiliation

  1. FLNP- Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Russia
  2. bNational Institute of Research and Development for Technical Physics, D. Mangeron 47, Iassy, Romania
  3. ”Al.I.Cuza” University, Carol I 6, Iassy Romania

Abstract

We have synthesized magnetoresistive bulk manganites by sol-gel technology. The synthesis method started from a homogeneous aqueous solution consisting of the metal ions and chelating or bridging ligands. The proof of the chemical composition and the Mn3+Mn4+ concentrations ratio were obtained by means of EDX and, respectively, van Santen methods. The sintered samples were also investigated by means of electron microscopy and XRD; lattice constants, space group, position of cations/anions in the unit cell, average size of the crystalline blocks and microstrains were obtained with TREOR, CechCell and FullProf programs. The variation of the specific/molar magnetization with the temperature was determined by using Foner –type magnetometer, between 77 and 550 K. The electric measurements were made by using a four-probe device. We found that the unit cell type and lattice parameters strongly depend on the (Nd, In) /Sr concentration and the sintering conditions. The extrinsic effects caused by the distorted boundaries layers of the crystallites, on the hand, and the (Nd, In)/Sr concentrations ratio, on other hand, rule over the transport behavior. The substitution of Nd with In seems to move the ferromagnetic metallic region of the (Nd0.67In0.33)1-xSrxMnO3 at lower Sr concentrations as compared with Nd1-xSrxMnO3 system..

Keywords

Magnetoresistance, Crystalline and magnetic structure, Nd-Sr manganites.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

M.-L. CRAUS, N. CORNEI, Synthesis and properties of some Nd-Sr manganites dopped with indium, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1736-1741 (2007)