Perovskite nanoparticles: Preparation by reactive milling and magnetic characteristics

Magnetic properties of La0.7Ca0.3MnO3 nanoparticles prepared by reactive milling

“…The inset in Fig. 4b shows a monotonic decrease of blocking temperature in range of milling time from 8 h to 16 h. From TEM result and magnetization data reported previously [5] we noted a systematic decrease of particle size with increasing milling time. Therefore, it is clear that the T B increases with decreasing particle size.…”

“…In our previous papers [5,6], we presented experiment results and theoretical analysis on La 0.7 Sr 0.3 MnO 3 nanoparticles system fabricated in SPEX D8000 mill. Magnetic measurements showed the existence of strong magnetic interaction between nanoparti- * Corresponding author.…”

Size effects and interactions in La0.7Ca0.3MnO3 nanoparticles

“…The situation of interacting superparamagnetic (SPM) nanoparticles of La 0.7 Sr 0.3 MnO 3 could be well described by using the mean-field approximation with a field correction to the argument of noninteracting SPM Langevin function L[(H ext +˛M)/k B T] [9,10]. The energy barrier coming from the anisotropy contributions of each particle is also modified with interparticle interactions and, for the different interaction limits, the opposite dependence of T B with the strength of the interactions is predicted [11,12,25].…”

La0.7Ca0.3MnO3 perovskite synthesized by reactive milling method: The effect of particle size on the magnetic and electrical properties

“…Reactive milling (or mechanical alloying) allows preparing samples at rather low temperature of nanocrystalline oxide phases normally produced at very high temperature [7,8].…”

“…In our previous works [8,12,13], we have presented experiment results and theoretical analysis on magnetic properties of La 0.7 Sr 0.3 MnO 3 and La 0.7 Ca 0.3 MnO 3 nanoparticles synthesized by reactive milling with various milling time. In this paper, we report the effect of annealing temperature on microstructure, magnetic and electrical properties of La 0.7 Ca 0.3 MnO 3 nanoparticles synthesized by the same method.…”