인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
In this study, we examine the magnetocaloric behavior of the newly discovered perovskite oxide La 0.7 Ba 0.25 Nd 0.05 Mn 1- x Zn x O 3 ( x = 0.03 and 0.05). We focus on key magnetocaloric parameters, such as magnetic entropy change, heat capacity change, full-width at half-maximum (FWHM), and relative cooling power (RCP) by analysing the temperature-dependent magnetization using a phenomenological model. The impact of Zn doping on both the magnetic properties and the magnetocaloric effect (MCE) is also investigated. As Zn concentration increases, the ferromagnetic to paramagnetic (FM-PM) transition temperature (TC) decreases, indicating a suppression of the magnetic behaviour. Notable changes in entropy and specific heat are observed around TC. We predict the MCE parameters by calculating the temperature-dependent magnetization data with varying external magnetic fields (H) using the model. The RCP values are 338.80 J / kg for x = 0.03 and 335.44 J / kg for x = 0.05 at a magnetic field of 50 kOe. All the results suggest that the material holds significant potential for magnetic refrigeration (MR) applications over a broad temperature range near room temperature. The Arrott plots confirm the second-order phase transition (SOPT) between the ferromagnetic and paramagnetic phases. Furthermore, the accuracy of the results and the reliable predictions of the MCE parameters validate the effectiveness of the phenomenological model.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.