Mechano-Thermal Synthesis of Nanocrystalline RuSr_2Eu_(1.5)Ce_(0.5)Cu_2O_(10-δ) Materials: Micro-Structural, Optical and Magnetic Properties

摘要

The nanocrystalline RuSr_2Eu_(1.5)Ce_(0.5)Cu_2O_(10-δ) (referred to as Ru1222Eu) materials were successfully prepared by mechano-thermal route and studied the Ru1222Eu materials by powder XRD, FT-IR, SEM-EDX and ac-susceptibility measurements. The as-milled powder annealed at 950 - 1000°C is crystallized in nearly single tetragonal phase of Ru1222Eu materials with average crystalline size of ～40 nm. Agglomeration of fine particles is seen through SEM micro-images in the Ru1222Eu phase materials. Contrary to magneto-superconductivity, a magnetic ordering is seen at ～60 K for Ru1222Eu phase under low applied field of 0.5 Oe at 10 Hz.