CAJ | 학술논문

用粉末冶金法(磁场压制烧结)制备(Mn_(1-x)Fe_x)_5Sn_3(x=0.1～0.5)合金,对其晶体结构、居里温度进行研究.室温XRD分析表明,该系列合金均保持Mn_5Sn_3的InNi_2型相结构,计算发现合金的晶格常数随着x量增大而减小.通过M-T曲线测量结果表明:居里温度T_C在室温附近244～391 K连续可调,且随着Fe含量的增加而提高,居里温度随成分近似呈线性变化:成分为(Mn_(0.70)Fe_(0.30))_5Sn_3合金的居里温度为295 K,在外加磁场为0～1.5 T下,最大磁熵变约为0.87 J·(kg·K)~(-1),是一种成本低廉的室温磁制冷候选材料.
용분말야금법(자장압제소결)제비(Mn_(1-x)Fe_x)_5Sn_3(x=0.1～0.5)합금,대기정체결구、거리온도진행연구.실온XRD분석표명,해계렬합금균보지Mn_5Sn_3적InNi_2형상결구,계산발현합금적정격상수수착x량증대이감소.통과M-T곡선측량결과표명:거리온도T_C재실온부근244～391 K련속가조,차수착Fe함량적증가이제고,거리온도수성분근사정선성변화:성분위(Mn_(0.70)Fe_(0.30))_5Sn_3합금적거리온도위295 K,재외가자장위0～1.5 T하,최대자적변약위0.87 J·(kg·K)~(-1),시일충성본저렴적실온자제랭후선재료.
(Mn_(1-x)Fe_x)_5Sn_3 (x=0.1-0.5) alloys were prepared by powder metallurgy method with magnetic field pressing and sintering. The crystal structure, Curie temperature and magnetic entropy change of the alloys were studied. XRD patterns reveal that all samples of this system maintain a hexagonal In Ni_2-type structure with space group P6_3/mmc. The lattice parameter and cell volumes of the (Mn_(1-x)Fe_x)_5Sn_3 alloys decrease with x increasing by calculation, while the Curie temperature of these alloys increases almost linearly and is tunable continually from 244 K to 391 K by M-T curves. The Curie temperature of (Mn_(0.70)Fe_(0.30))_5Sn_3 is about 295 K close to room temperature, and the maximum magnetic entropy change is 0.87(kg·K)~(-1) with a field change form 0 to 1.5 T. The curve of magnetic entropy change of (Mn_(0.70)Fe_(0.30))_5Su_3 is flat in a wide temperature range. It is indicated that the (Mn_(1-x)Fe_x)_5Sn_3 alloy is a suitable candidate with low cost for Ericsson cycle.