The STUDIA UNIVERSITATIS BABE┼×-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

 
       
         
    STUDIA PHYSICA - Issue no. 1 / 2013  
         
  Article:   PREPARATION BY HIGH ENERGY BALL MILLING AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE La1.4Ca1.6Mn2O7 PEROVSKITE.

Authors:  E. DOROLTI, R. TETEAN.
 
       
         
  Abstract:  

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

 
         
     
         
         
      Back to previous page