论文部分内容阅读
We reported the magnetic properties and magnetocaloric effects(MCE) of(La0.8Ho0.2)2/3Ca1/3MnO3 and(La0.5Ho0.5)2/3Ca1/3MnO3 nanoparticles by sol-gel technique.With this method,we were able to obtain the samples with particle diameters ranging from 50 to 200 nm.In the(La1-xHox)2/3Ca1/3MnO3 compound,an external magnetic field induced a magnetic transition from an paramagnetic phase to a ferromagnetic phase above Ts=105-135 K,leading to magnetocaloric effects.The maximum value of ΔSM was 1.19 J/(kg·K) at 100 K and 2.03 J/(kg·K) at 152 K for a magnetic field change of 5 T.Because both samples had large relative cooling power(RCP) and wide δTFWHM,the study on systems with the(La1-xHox)2/3Ca1/3MnO3-related magnetic transitions may open an important field in searching good magnetic materials.
We reported the magnetic properties and magnetocaloric effects (MCE) of (La0.8Ho0.2) 2 / 3Ca1 / 3MnO3 and (La0.5Ho0.5) 2 / 3Ca1 / 3MnO3 nanoparticles by sol-gel technique. (La1-xHox) 2 / 3Ca1 / 3MnO3 compound, an external magnetic field induced a magnetic transition from an paramagnetic phase to a ferromagnetic phase above Ts = 105- 135 K, leading to magnetocaloric effects. The maximum value of ΔSM was 1.19 J / (kg · K) at 100 K and 2.03 J / (kg · K) at 152 K for a magnetic field change of 5 T. Beause both samples had large relative cooling power (RCP) and wide δTFWHM, the study on systems with the (La1-xHox) 2 / 3Ca1 / 3MnO3-related magnetic transitions may open an important field in searching good magnetic materials.