Ab initio Hartree-Fock investigation of the structural, electronic, and magnetic properties of Mn3O4

被引:122
作者
Chartier, A
D'Arco, P
Dovesi, R
Saunders, VR
机构
[1] Lab Petrol, F-75252 Paris 05, France
[2] Univ Turin, Dipartimento Chim Inorgan Chim Fis & Chim Mat, I-10125 Turin, Italy
[3] SERC, Daresbury Lab, CLRC, Warrington WA4 4AD, Cheshire, England
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 20期
关键词
D O I
10.1103/PhysRevB.60.14042
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Noncubic Mn3O4 spinel (Hausmannite) has been investigated by using the periodic Hartree-Fock CRYSTAL95 program. The structure has been fully optimized, and the computed geometry compares well with the experimental data. The analysis of the wave function in terms of Mulliken charges shows that the net charge of the tetrahedral cation (Mn-A) is very close to the formal one (+1.86 electrons to be compared to +2); for the octahedral site (Mn-B) the net charge is far from the ideal ionic model (+2.3 electrons instead of +3), and the Mn-B-O bonds show some covalent character. The same analysis performed on the spin density gives magnetic moments very close to the ones corresponding to the ideal d(4) and d(5) configurations (4.90 and 3.97 electrons for Mn-A and Mn-B, respectively). The total energy of seven different spin configurations has been evaluated and the corresponding wave function analyzed. Superexchange coupling constants are evaluated by mapping the ab initio energy data to the Ising hamiltonian. It turns out that the intertetrahedral and tetrahedral-octahedral magnetic interactions are small and antiferromagnetic, in agreement with experimental evidence. The Mn-B-Mn-B alone the octahedra chains is ten times larger, whereas the interchain interaction is small and ferromagnetic. [S0163-1829(99)03843-6].
引用
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页码:14042 / 14048
页数:7
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