Ternary nitride synthesis: Ammonolysis of ternary oxide precursors

被引：0

作者：

Bem, D.S. ^{[1
]}

Houmes, J.D. ^{[1
]}

zur Loye, H.-C. ^{[1
]}

机构：

[1] Massachusetts Inst of Technology, Cambridge, MA, United States

来源：

Materials Science Forum | 1994年 / 152-5卷

关键词：

Crystal structure - Decomposition - Iron compounds - Manganese compounds - Nitrides - Tungsten compounds;

D O I：

10.4028/www.scientific.net/msf.152-153.183

中图分类号：

学科分类号：

摘要：

The ternary nitrides FeWN2, α-MnWN2, and β-MnWN2, have been synthesized through the ammonolysis of transition metal tungstate precursors. FeWN2 is hexagonal with a unit cell of a = 2.8724(1) angstroms and c = 10.973(4) angstroms. Rietveld refinements were performed in the space group P3¯1C with Rwp = 9.91%, and Rp = 7.23%. Ammonolysis of MnWO4 yields two products: at 700 °C α-MnWN2 [a = 2.914(8), c = 16.562(6) space group R3] and at 800 °C β-MnWN2 [a = 2.922(3), c = 10.897(9) space group P63mmc]. Both MnWN2 compounds have similar a lattice parameters, however the c parameter of β-MnWN2 is shorter by 5.665 angstroms. This shortening of the c axis results from a change in the stacking sequence of the metal layers in the structure. This is the first example of a ternary nitride that can be synthesized in two structural modifications.

引用

页码：183 / 186