Synthesis and Magnetic Properties of the La0.50Ba0.50MnO3 Nanomanganites

Aleksey Trukhanov 1Svyatoslav Stepin Sergei Trukhanov 2Cristian E. Botez 3Henryk Szymczak 4

1. Vitebsk State University (VSU), av. Moskovskaya 33, Vitebsk 210036, Belarus
2. The Institute of Solid State & Semiconductor Physics, National Academy of Science of Belarus, 17 P.Brovka, Minsk 220072, Belarus
3. University of Texas, El Paso, Texas 79968-0515, United States
4. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

La0.50Ba0.50MnO3 nanosample has been synthesised using modified sol-gel method. The C3H8O3 glycerin has been used as organic matrix. Parent nanosample has been annealed in air at Tsinth = 500 0C, 700 0C, 900 0C и 1500 0C. Average size of crystallite increases with annealed temperature from D ~ 30 nm to ~ 7 µm. The stoichiometry was correct. All the samples had cubic perovskite-like unit cell with increasing parameter from a ~ 3.787 Å to ~ 3.904 Å as average size of crystallite increases [1]. Pressure effect is maximum for the sample with D ~ 30 nm. Temperature Curie and spontaneous magnetic moment have non-monotone behavior and increases from TC ~ 264 K to ~ 331 K and from σS ~ 1.52 µB/f.u. to ~ 3.31 µB/f.u., respectively. Anomalous magnetic properties of the La0.50Ba0.50MnO3 is explained by frustration of Mn3+-O-Mn4+ exchange interactions [2] and compression of the crystal lattice as a result of nanograin formation [3]. This study has been partly supported by the BFBR (F06R-078).

References:

1.S.V. Trukhanov, L.S. Lobanovski et al., J. Phys.: Condens. Matter 15, 1783 (2003).

2.S.V. Trukhanov, J. Mater. Chem. 13, 347 (2003).

3.K.S. Shankar, S. Kar, G.N. Subbanna et al., Solid State Commun. 129, 479 (2004).

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Sergei Trukhanov
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-05 11:43
Revised:   2009-06-07 00:44