Determination of the crystal structure of δ-MoN by neutron diffraction

被引：91

作者：

Bull, CL

McMillan, PF

Soignard, E

Leinenweber, K

机构：

[1] Royal Inst Great Britain, Davy Faraday Res Lab, London W1X 4BS, England

[2] UCL, Christopher Ingold Labs, Dept Chem, London, England

[3] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 4-5期

关键词：

hardness; MoN; neutron diffraction; high pressure; structure determination;

D O I：

10.1016/j.jssc.2003.11.033

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We have determined the crystal structure of ordered hexagonal delta-MoN by use of powder X-ray diffraction and time-of-flight neutron diffraction. A disordered variety of the compound was first prepared by high-temperature ammonolysis Of MoCl5. This material has hexagonal symmetry with the space group P6(3)mc with a = 2.87(2) and c = 2.81 (1) Angstrom. Upon high pressure annealing, the N-atoms become ordered and the unit cell doubles in size: a = 5.73659(10) and c = 5.61884(17) Angstrom. The superconducting transition temperature increases from 4K in the disordered compound to 12.1 K in the ordered phase. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：1488 / 1492

页数：5

共 13 条

[1] HIGH-PRESSURE HIGH-TEMPERATURE EXPERIMENTS ON DELTA-MON [J].