The magnetocaloric effect in perovskite-type GdMnO 3 and Gd(Mn 0.25 Fe 0.25 Co 0.25 Ni 0.25 )O 3 prepared by sol-gel method Yun-Hyuk Choi School of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan, Gyeongbuk 38430, Republic of Korea (E-mail: yunhyukchoi@cu.ac.kr) A perovskite-type GdMnO 3 has been widely studied as a promising magnetocaloric material. The magnetocaloric effect (MCE) has been in the spotlight for its highly energy-efficient, non-refrigerant, and eco-friendly solid-state cooling mechanism. When a magnetic field is applied and removed to the magnetic material, it is heated and cooled, respectively, where this is called MCE. It isdrawing a lot of attention as a novel paradigm to replace a Freon gas in the fields such as air conditioners and refrigerators.However, although it has been about 100 years since the discovery of magnetic refrigeration materials, there are still many challenges to solve, including the development of materials for practical applications. Therefore, to realize the application of magnetic refrigeration materials in the future, it is of importance to develop high-efficient magnetocaloric materials that represent the maximum heat capacity at the low temperature of ~20 K. In this study, we have synthesized GdMnO 3 and B-site medium-entropy oxide Gd(Mn 0.25 Fe 0.25 Co 0.25 Ni 0.25 )O 3 through the sol-gel method.Their structure and composition have been characterizedusing the various methods such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) method. To evaluate the magnetocaloric properties for both samples, the temperature dependence of magnetic properties has been measured by means of vibrating sample magnetometer (VSM). The results will be discussed in terms of the structure-property relationship.
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