A detailed investigation of the synthesis of CrWN2 from a chemical precursor has revealed that it forms via an intermediate disordered nitride. The kinetics of this disordered to ordered phase transformation have been determined and suggest that the layered compound nucleates and grows epitaxially out of the disordered nitride via a two-dimensional transformation mechanism in which cation ordering takes place at the interfaces between the two structures. Results from high resolution transmission electron microscopy analysis were used to identify the interfacial relationship between the disordered and ordered phases. In combination with our kinetic data, this information implies that ordering occurs through a short-range, interfacially controlled diffusional process.
Revised: October 25, 2007 |
Published: June 1, 2004
Citation
Weil K.S. 2004.The Chromium Tungsten Nitride System: Evidence of a Disorder-Order Phase Transformation.Journal of Solid State Chemistry 177, no. 6:1976-1986.PNNL-SA-39896.