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    STUDIA PHYSICA - Ediţia nr.1 din 2013  
         
  Articol:   PREPARATION BY HIGH ENERGY BALL MILLING AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE La1.4Ca1.6Mn2O7 PEROVSKITE.

Autori:  E. DOROLTI, R. TETEAN.
 
       
         
  Rezumat:  

Nanocrystalline double layered La1.4Ca1.6Mn2O7 powders were synthesized by grinding the constituent oxides in air at room temperature, using a high-energy planetary mill. The reaction process, evaluated by analyzing the evolution of the crystalline structure in the XRD patterns, is completed after about 15 h. Energy dispersive x-ray microanalysis of the final sample revealed a good homogeneity of the powder with composition nearly identical to the nominal one. The grain morphology observed by Scanning Electron Microscopy shows the aggregation of the nanocrystals in fine particles. The magnetic measurements indicate that the perovskite nanoparticles with sizes smaller than 10 nm obtained by reacting milling have significant defects at the surface, leading to a serious decrease of the magnetic moments in comparison to the bulk material.

Keywords: nanoparticles; double layered perovskite; high energy ball milling

 
         
     
         
         
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