Neutron diffraction studies of stoichiometric and oxygen intercalated La2NiO4 single crystals

被引：71

作者：

Paulus, W

Cousson, A

Dhalenne, G

Berthon, J

Revcolevschi, A

Hosoya, S

Treutmann, W

Heger, G

Le Toquin, R

机构：

[1] Univ Rennes 1, CNRS, LCSIM,UMR 6511, Inst Chim Rennes, F-35042 Rennes, France

[2] CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[3] Univ Paris 11, CNRS, Lab Phys Chim Etat Solide, UMR 8648, F-91405 Orsay, France

[4] Univ Yamanashi, Fac Engn, Inst Inorgan Synth, Kofu, Yamanashi 4008511, Japan

[5] Univ Marburg, Inst Mineral, D-35032 Marburg, Germany

[6] Rhein Westfal TH Aachen, Inst Kristallog, D-52056 Aachen, Germany

来源：

SOLID STATE SCIENCES | 2002年 / 4卷 / 05期

关键词：

lanthanum nickelates; neutron diffraction; oxygen intercalation; electrochemistry; maximum entropy method; crystal structure; phase transition; twinned crystals;

D O I：

10.1016/S1293-2558(02)01299-2

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Single crystal neutron diffraction was used to characterize the structural evolution of electrochemically oxidized La2NiO4+delta crystals as a function of temperature. In order to better describe the disorder of the apical and interstitial oxygen atoms we used the maximum entropy method. There is structural evidence not to attribute a peroxide character between the apical and interstitial oxygen atoms situated in exactly (1/4 1/4 1/4) of the F4/mmm unit cell. We have also reinvestigated the structural phase transition of stoichiometric La2NiO4 crystals at 74 K. The symmetry changes from Bmab to Pccn and remains orthorhombic down to 5 K. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

引用

页码：565 / 573

页数：9

共 39 条

[1] Crystal growth and characterization of the spin-ladder compound (Sr,Ca)14Cu24O41 [J].