کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1329641 | 1500095 | 2015 | 9 صفحه PDF | دانلود رایگان |
• Precursor polymerization level is lower in the presence of lighter lanthanides.
• Lighter lanthanide perovskite nanoparticles after calcination are lower-sized.
• Nanoparticles obtained by this method have lamellae microstructure.
• Jahn–Teller distortion declines for heavier lanthanide perovskites.
• Oxygen vacancy phase was observed in lighter lanthanide perovskites.
The synthesis of LnMn0.5Fe0.5O3 perovskite nanoparticles by the polymer precursor method showed a strong intrinsic dependence with different lanthanides (Ln=La, Pr, Nd, Sm and Gd). The polymerization level reached in the polymer precursor was proportional to the atomic number of lanthanide with exception of samarium, which showed the formation of a different precursor based in a citrate chelate with ethyleneglycol bonded as adduct. The increasing level of polymerization of the polymer precursors showed the formation of large-size perovskite nanoparticles after its calcination. SAXS and TEM analyses suggested that nanoparticles obtained, using this method, have a squared-like microstructure in connection with the polymer precursor microstructure. Structural analysis showed an orthorhombic structure with a slight decline in the Jahn–Teller distortion when the atomic number of lanthanide increases. Mössbauer spectroscopy showed the presence of a majority site in agreement with the Pbnm orthorhombic structure best fitted with Rietveld refinements and in some cases, a more distorted site attributed to local inhomogeneities and oxygen vacancies.
Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 221, January 2015, Pages 325–333