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  • 1 Institute of Physical Chemistry 202 Spl. Independentei 77208 Bucharest Romania 202 Spl. Independentei 77208 Bucharest Romania
  • 2 SC ICPE SA. 313 Spl. Unirii 74204 Bucharest Romania 313 Spl. Unirii 74204 Bucharest Romania
  • 3 SC MATPUR SA. 41-45 Drumul intre tarlale 73611 Bucharest Romania 41-45 Drumul intre tarlale 73611 Bucharest Romania
  • 4 LACECA Research Centre 95 Siret 78308 Bucharest Romania 95 Siret 78308 Bucharest Romania
  • 5 University of Bucharest Faculty of Chemistry, Department of Physical Chemistry 13 Blv. Republicii Bucharest Romania 13 Blv. Republicii Bucharest Romania
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Abstract  

It is well known that the manganites-based solid solutions are interesting for their electric and magnetic properties. LaMnO3 exhibits a distorted perovskite structure due to Mn3+ ion, which determines the presence of the Jahn–Teller effect. Replacing La3+ host ions by cations of lower valence leads to the disappearance of this effect and changes the characteristics of these materials. Although the formation of manganites-based solid solutions has been intensively studied, there are some unelucidated aspects concerning their formation mechanism, depending both on the precursors used and on the thermal treatment applied in order to obtain suitable properties. In this work the formation mechanism of La0.7M0.3MnO3 (M=Ca, Sr, Ca+Sr in equimolecular mixture) solid solutions, in isothermal and non-isothermal conditions, was studied. For this purpose XRD, DTA/TG and spectral techniques were used. The solid solutions formation was found to be more dependent on the Mn-precursors type than the thermal treatment conditions.

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