%0 Journal Article
%T Magnetic Ordering and Exchange Interaction of Laves Compounds Sm0.9Pr0.1(Fe1-xCox)2<br>Magnetic Ordering and Exchange Interaction of Laves Compounds Sm0.9Pr0.1（Fe1—xCox）2
%A Zhijun GUO
%A Zhidong ZHANG
%A Xinguo ZHAO
%A Xiaoping SONG
%A Bowen WANG
%A Ximei JIN
%A Dianyu GENG
%A <br>ZhijunGUO
%A ZhidongZHANG
%J 材料科学技术学报
%D 2002
%I 
%X Structure, magnetic properties and magnetostriction of Sm0.9Pr0.1(Fe1-xCox)2 compounds have been investigated by means of X-ray diffraction, a.c. initial susceptibility, extracting sample magnetometer, MSssbauer spectroscopy and standard strain gauge techniques. The lattice parameter a of the MgCu2-type Laves compounds Sm0.9Pr0.1(Fe1-xCox)2 decreases nonlinearly with increasing Co concentration, deviating from the Vegard's law.Curie temperature Tc increases initially from 668 K for x=0 to 694 K for x=0.2 and then decreases to 200 K for x=1.0. The saturation magnetization Ms at temperatures 1.5 K, 77 K and 300 K have the same variation tendency as the composition dependence of Curie temperature, in consistence with rigid-band model. The easy magnetization direction (EMD) of Sm0.9Pr0.1(Fe1-xCox)2 lies along 111] direction in the range x≤0.6, and changes to 110] for x=0.8, while Sm0.9Pr0.1Co2 stays in the paramagnetic state at room temperature. The composition dependence of the average hyperfine field, Hhf, demonstrates a similar variation tendency as that of the saturation magnetization Ms and Curie temperature Tc. The spontaneous magnetostricton λ111 increases with increasing Co content.The saturation magnetostriction λs decreases monotonically with increasing x, which is caused by the increase of magnetostriction constant λ100 with opposite sign to that of λ111. A two-sublattice model has been proposed to understand the intermediate region between the 111] and 110] spin configurations, which can also be used to explain the temperature dependence of magnetization.
%K Sm0
%K 9Pr0
%K 1(Fe1-xCox)2
%K Magnetic ordering
%K Exchange interaction<br>顺磁性
%K 钐
%K 镨
%K 铁
%K 钴
%K X射线衍射
%K 复合物
%K 合金
%K Sm0.9Pr0.1（Fe1－xCox）2
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=93C9AC4B685326D2&yid=C3ACC247184A22C1&vid=13553B2D12F347E8&iid=38B194292C032A66&sid=D5C73DEF4CF8FAF3&eid=A1266CF37D675CF1&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=0