Quaternary rare earth transition metal arsenide oxides RTAsO (T=Fe, Ru, Co) with ZrCuSiAs type structure

被引：238

作者：

Quebe, P ^{[1
]}

Terbüchte, LJ ^{[1
]}

Jeitschko, W ^{[1
]}

机构：

[1] Univ Munster, Inst Anorgan Chem, D-48149 Munster, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2000年 / 302卷 / 1-2期

关键词：

rare earth compounds; arsenide oxides; single crystal X-ray diffraction; structure determination;

D O I：

10.1016/S0925-8388(99)00802-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The equiatomic quaternary compounds RFeAsO (R = La-Nd, Sm, Gd), RRuAsO (R = La-Nd, Sm, Gd-Dy) and RCoAsO (R = La-Nd) crystallize with the tetragonal ZrCuSiAs type structure, which was refined from single-crystal X-ray diffractometer data of PrFeAsO: P4/nmm, Z = 2, a = 398.5(1) pm, c = 859.5(3) pm, R = 0.058 for 167 structure factors and 12 variable parameters. All atomic positions are fully occupied. Chemical bonding in PrFeAsO can be rationalized with oxidation numbers corresponding to the formula Pr+3Fe+2As-3O-2. An electron count of 18 for the iron atoms can only be achieved if Fe-Fe interactions of 281.8 pm are considered as bonding. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：70 / 74

页数：5

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