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Synthesis and Magnetic Properties of the La_0.50Ba_0.50MnO₃ Nanomanganites

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

La_0.50Ba_0.50MnO₃ 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 T_sinth = 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 T_C ~ 264 K to ~ 331 K and from σ_S ~ 1.52 µ_B/f.u. to ~ 3.31 µ_B/f.u., respectively. Anomalous magnetic properties of the La_0.50Ba_0.50MnO₃ 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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Synthesis and Magnetic Properties of the La0.50Ba0.50MnO3 Nanomanganites

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

Synthesis and Magnetic Properties of the La_0.50Ba_0.50MnO₃ Nanomanganites

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