Synthesis and structure of the ternary and quaternary strontium nitride halides, Sr{sub 2}N(X, X') (X, X'=Cl, Br, I)
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)
A number of new, layered nitride mixed halides have been synthesised in the quaternary phase systems Sr-N-Cl-Br and Sr-N-Br-I. The variation in structure with composition has been investigated by powder X-ray and powder neutron diffraction techniques and the structure of strontium nitride iodide, Sr{sub 2}NI, has been determined for the first time (rhombohedral space group R-3m, a=4.0103(1)A, c=23.1138(2)A, Z=3). A continuous solid solution exists between Sr{sub 2}NCl and Sr{sub 2}NBr with intermediate compounds adopting the same anti-{alpha}-NaFeO{sub 2} structure (rhombohedral space group R-3m) as the ternary end members. A similar smooth and linear relationship between structure and composition is seen from Sr{sub 2}NBr to Sr{sub 2}NI and hence cubic close packing of metal-nitrogen layers is adopted regardless of halide, X (X'). While nitride and halide anions occupy distinct crystallographic sites, there is no ordering of the halides in the quaternary materials irrespective of stoichiometry or temperature (between 3 and 673K)
- OSTI ID:
- 20784841
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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