Study of the ferrodistorsive orbital ordering in NaNiO2 by neutron diffraction and submillimeter wave ESR

被引：75

作者：

Chappel, E

Núñez-Regueiro, MD

Chouteau, G

Isnard, O

Darie, C

机构：

[1] CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble, France

[2] Max Planck Inst Festkorperforsch, F-38042 Grenoble, France

[3] CNRS, Lab Cristallog, F-38042 Grenoble, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 2000年 / 17卷 / 04期

关键词：

D O I：

10.1007/s100510070099

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

NaNiO2 has been studied by neutron-powder diffraction, magnetic susceptibility and submillimeter wave ESR. The monoclinic structure at room temperature is characterised by a ferrodistorsive orbital ordering due to the Jahn-Teller (JT) effect of the Ni3+ ions in title low spin state. NaNiO2 undergoes a structural transition at around 480 EC, above which the orbital ordering disappears. The high temperature phase is rhombohedral with the layered alpha -NaFeO2 structure (R (3) over barm space group). The magnetic susceptibility exhibits hysteresis and we observe a change of the Curie-Weiss law parameters above the JT transition. The anisotropy of the g-factor at 200 K can be attributed to the JT effect which favours the \3z(2) - r(2)> orbital occupation. Finally, the interplay between the magnetic and structural properties of NaNiO2 and Li1-xNi1+xO2 is discussed.

引用

页码：615 / 622

页数：8

共 22 条

[1] The layered intercalation compounds Li(Mn1-yCoy)O2:: Positive electrode materials for lithium-ion batteries [J].