A structural and magnetic study of the defect perovskite LaNiO2.5 from high-resolution neutron diffraction data

被引:49
作者
Alonso, JA
MartinezLope, MJ
GarciaMunoz, JL
FernandezDiaz, MT
机构
[1] CSIC,INST CIENCIA MAT,E-28193 BARCELONA,SPAIN
[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE 9,FRANCE
关键词
D O I
10.1088/0953-8984/9/30/010
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The fine details of the crystal structure of LaNiO2.5 have been determined from a high-resolution neutron diffraction study at room temperature. The powder sample, showing an excellent crystallinity, was prepared by topotactic reduction of LaNiO3 in the presence of Zr. The unit cell can be described as a monoclinic 2a(0) x 2a(0) x 2a(0) superstructure of perovskite (a(0) is the edge of the ideal perovskite), and contains one-dimensionally infinite chains of Battened NiO6 octahedra running parallel to the c axis, with NiO4 square planar units connecting the octahedra chains. Bond valence calculations are consistent with divalent Ni cations in both coordination polyhedra. Neutron diffraction experiments reveal 3D magnetic ordering below T-N approximate to 80 K. A magnetic structure with S = 1 moments antiferromagnetically coupled along the NiO6 chains parallel to the c axis is proposed, and the absence of magnetic moments at the NiO4 units is also discussed.
引用
收藏
页码:6417 / 6426
页数:10
相关论文
共 19 条
[1]   PREPARATION AND CRYSTAL-STRUCTURE OF THE DEFICIENT PEROVSKITE LANIO2.5, SOLVED FROM NEUTRON POWDER DIFFRACTION DATA [J].
ALONSO, JA ;
MARTINEZLOPE, MJ .
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1995, (17) :2819-2824
[2]   HOLE AND ELECTRON DOPING OF RNIO(3) (R=LA, ND) [J].
ALONSO, JA ;
MARTINEZLOPE, MJ ;
HIDALGO, MA .
JOURNAL OF SOLID STATE CHEMISTRY, 1995, 116 (01) :146-156
[3]  
BEGGREN J, 1971, ACTA CHEM SCAND, V25, P3616
[4]   BOND-VALENCE PARAMETERS FOR SOLIDS [J].
BRESE, NE ;
OKEEFFE, M .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1991, 47 :192-197
[5]  
Brown I.D., 1981, STRUCTURE BONDING CR, P1
[6]   REDUCED FORMS OF LANIO3 PEROVSKITE .1. EVIDENCE FOR NEW PHASES - LA2NI2O5 AND LANIO2 [J].
CRESPIN, M ;
LEVITZ, P ;
GATINEAU, L .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1983, 79 :1181-1194
[7]  
GAI PL, 1975, Z NATURFORSCH A, V30, P1092
[8]   INFLUENCE OF CARRIER INJECTION ON THE METAL-INSULATOR-TRANSITION IN ELECTRON-DOPED AND HOLE-DOPED R(1-X)A(X)NIO(3) PEROVSKITES [J].
GARCIAMUNOZ, JL ;
SUAAIDI, M ;
MARTINEZLOPE, MJ ;
ALONSO, JA .
PHYSICAL REVIEW B, 1995, 52 (18) :13563-13569
[9]   NEUTRON-DIFFRACTION STUDY OF RNIO3 (R = LA,PR,ND,SM) - ELECTRONICALLY INDUCED STRUCTURAL-CHANGES ACROSS THE METAL-INSULATOR-TRANSITION [J].
GARCIAMUNOZ, JL ;
RODRIGUEZCARVAJAL, J ;
LACORRE, P ;
TORRANCE, JB .
PHYSICAL REVIEW B, 1992, 46 (08) :4414-4425
[10]   CLASSIFICATION OF TILTED OCTAHEDRA IN PEROVSKITES [J].
GLAZER, AM .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1972, B 28 (NOV15) :3384-&