摘要
系统地研究了新型稀土-半导体-磁性金属所组成的RSn3-xCox（R=Nd,Sm; x=0～0.3）系列的制备、晶体结构以及磁性.研究表明：RSn3-xCox具有AuCu3型立方结构,空间群Pm3m,稀土原子占据la晶位,Sn占据3c晶位,Co部分替代Sn占据3c晶位.点阵常数与晶胞体积常数随Co掺杂量的增加而减小.其磁性变化与Co含量密切相关,随着Co含量的增加,稀土半导体化合物中产生铁磁性相,在Sm-Sn-Co体系中SmSn2.8 Co0.2呈现混合磁性、SmSn2.7Co0.3呈现铁磁性,这有别于纯RSn3系列的磁性（低温反铁磁型和室温的顺磁性）,为这类稀土半导体化合物作为新型磁电子材料的潜在应用提供了可能性.
The synthesis and crystal structure ＆ magnetic 0.3） compounds in rare earth-semiconductor-3d transition metal properties of novel RSn3-x Cox （ R= Nd, Sm; x = O-- ternary system were systematically investigated. It reveals that RSn3-xCox crystallizes in cubic AuCua type structure with a space group of Pm^-3m. The 1a and 3c crystal positions are occupied by R and （Sn,Co） atoms respectively. Co substitution for Sn prefers to occupy the 3c site. The lattice parameters and unit cells volumes decrease with increasing Co contents in compounds. The magnetic properties of RSn3-x Cox （R= Nd, Sm） are sensitive to Co doping contents. The paramagnetic, mixture of ferromagnetic and para- magnetic, and ferromagnetic are observed in SmSn3-x Cox （x≤0. 1）, SmSn2.8 Co0.2 and SmSn2.7 Co0. 3, respectively. Co doping in RSna induces the presence of ferromagnetic phase in compounds, which is totally different from those of pure binary RSna （low temperature antiferromagnetic and paramagnetic at room temperature）. This study supplies the pos- sibility for their potential application as novel magneto-electronic material.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第14期72-76,共5页
Materials Reports
基金
国家自然科学基金(11274110)
