NEUTRON-DIFFRACTION STUDY OF THE FERRIMAGNETIC SPINEL NICO2O4

被引：79

作者：

BATTLE, PD ^{[1
]}

CHEETHAM, AK ^{[1
]}

GOODENOUGH, JB ^{[1
]}

机构：

[1] INORGAN CHEM LAB,OXFORD OX1 3QR,ENGLAND

来源：

MATERIALS RESEARCH BULLETIN | 1979年 / 14卷 / 08期

关键词：

D O I：

10.1016/0025-5408(79)90066-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron-diffraction experiments at 4.2K on a polycrystalline sample of the spinel NiCo2O4 prepared at 320°C revealed 92% occupancy of the tetrahedral (A) sites by cobalt and Neel ferrimagnetism with mean A-site and B-site moments 〈μA〉 = 2.29(9)μB and 〈μB〉 = -0.97(13)μB. Diffuse scattering and electron microscopy demonstrated variations with position in the Ni/Co ratio. These and literature-magnetization data are interpreted with the assumption that the σ-bonding d orbitals form itinerant-electron states with overlapping energies for A-site Co2+ and B-site Ni2+ configurations. The formal valencies for these ions become low-spin CoA(3-δ)+ and NiB(2+δ)+, where δ increases with externally applied field H. © 1979.

引用

页码：1013 / 1024

页数：12

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