Abstract:We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca 0.8 Fe 2 Se 2 prepared via solid state reaction. X-ray diffraction showed that the main phase became FeSe when the sintering temperature increased above 350 °C. The temperature dependence of magnetization (M-T curves) recorded in zero-field-cooled mode by SQUID magnetometer showed some bumps at around 120 K to 140 K. These bumps moved to lower temperatures when the processing temperature increased above 550 °C. On the other hand, pure FeSe materials produced at 900 °C for 24 h showed a sharp superconducting transition T c,onset = 8.16 K and the critical current density of 6,252 A/cm 2 at 5 K, self-field. SEM results indicated an enhanced grain connectivity.
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