Relationship between the synthesis parameters and the morphology of manganite nanoparticle-assembled nanostructures

✍ Scribed by A.G. Leyva; H.E. Troiani; C.J. Curiale; R.D. Sanchez; P. Levy

• Book ID: 104079918
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 449 KB
• Volume: 398
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.04.040

✦ Synopsis

Nanoparticles assembled into nanostructures (NAN) of manganese perovskite oxides for different compositions and diameters have been synthesized following a template-assisted method. We discuss the relationship among geometrical, structural and nanostructural parameters observed when synthesizing LaMnO 3 , La 0.66 Sr 0.33 MnO 3 , La 0.66 Ca 0.33 MnO 3 and La 0.325 Pr 0.300 Ca 0.375 MnO 3 manganite based complex oxides. For all the studied compounds, the structures are composed of an assembly of small (some few tens of nanometers) grains. They form nanotubes above some threshold diameter of the template, and nanowires below it. Here we focus on the correlation between grain size and the diameter at which the tube to wire crossover occurs. The threshold for this tube to wall crossover seems to depend on the specific compound. We present evidence from TEM observations that allow a rationalization of several phenomena in the synthesis process.