A layered material with approximate composition PbNbS 3 was found to have a very similar X-ray-diffraction pattern
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A layered material with approximate composition PbNbS3 was found to have a very similar X-ray-diffraction pattern to that of Sn1.17NbS3.17. Single-crystal studies revealed that the PbS portion could be described with cell parameters of a = 5.834 Å, b = 5.801 Å, c = 11.90 Å and the NbS2 part with cell parameters of a = 3.313 Å, b = 5.801 Å, c = 2 × 11.90 Å.
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(a) Give a brief description of the likely structure of "PbNbS3". (b) State how large the a axis would need to be to describe this structure using a conventional crystallographic unit cell. (c) From the cell parameters given, calculate the true compos- ition of "PbNbS3". (d) Suggest why the caxi of the NbS part of the structure is double that of the PbS part. (e) Suggest a likely structure for a material of composition Pb1.14Nb2S5.14.
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a b c d Figure 129 e The structure is ...View the full answer
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Related Book For
Solid State Materials Chemistry
ISBN: 9780521873253
1st Edition
Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt
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