Magnetic properties of Fe[S2CNC4H8O](2)X,X=Cl,Br,I

被引:2
作者
DeFotis, GC
Harlan, EW
Jarvis, WRA
Terranova, SA
Pugh, VJ
Marmorino, JL
Hogg, BD
Jensen, TR
机构
[1] Chemistry Department, College of William and Mary, Williamsburg
[2] Chemistry Department, Tufts University, Medford
关键词
D O I
10.1016/0304-8853(95)00546-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The title systems, including solvated and unsolvated forms, have been studied by dc susceptibility measurements. Curie-Weiss fits show that all materials except the unsolvated chloro system, which probably corresponds to an unusual ligand field case, are characterized by a (4)A(2) ground state. Average g values are in the range 2.05-2.10, while Weiss theta values are negative and increasingly so in the sequence chloro, bromo, iodo. Data are analyzed assuming axial and rhombic crystal field terms D[(S) over cap(z)(2)-S(S + 1)/3] and E[(S) over cap(x)(2)-(S) over cap(y)(2)], and incorporating exchange interactions in a mean-field approximation. All D values are positive and the zero-field splitting, delta = 2(D-2 + 3E(2))(1/2), increases in the order chloro, bromo, iodo, as does the size of the antiferromagnetic exchange. At low temperatures susceptibility maxima are observed, and antiferromagnetic transitions are inferred. The ratio T-c/T(chi(max)) suggests that some systems are of low magnetic dimensionality. Fits based on 2D-XY or 1D-Ising models are presented; in each case a strong interlayer or interchain interaction is also required. Ordering temperatures are compared with recent theory for T-c as a function of D and J for S = 3/2 antiferromagnets. Comparisons with previously studied Fe3+ systems of this general type are also made.
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页码:83 / 95
页数:13
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