Hexagonal phase into Au plate-like particles: A precession electron diffraction study
Crystalline defects can play a role in explaining speculative crystal growth mechanisms. Nevertheless, these structural features are commonly out of range for conventional diffraction characterizations. Particularly, defects in Au nanoplates (NPs) have attracted attention over the last 40 years due...
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Veröffentlicht in: | Materials characterization 2020-06, Vol.164, p.110313, Article 110313 |
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Sprache: | eng |
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Zusammenfassung: | Crystalline defects can play a role in explaining speculative crystal growth mechanisms. Nevertheless, these structural features are commonly out of range for conventional diffraction characterizations. Particularly, defects in Au nanoplates (NPs) have attracted attention over the last 40 years due to the so called 1/3{422} “Forbidden Reflections” (FR). This work ends with the discussion of nanoplate defects by performing large angle tilting experiments in Transmission Electron Microscope (TEM) using several imaging techniques such as: bright/dark field (BF/DF) and the advanced Precession Electron Diffraction (PED) technique. Obtained results can relate FR with a hexagonal Au phase, presenting for the first time two hexagonal diffraction patterns on 112¯3 and 51¯4¯3¯ zone axes. This hexagonal-fcc interface is located inside of plate particles and has a hexagonal phase with a = 0.2870 nm and c = 0.7351 nm lattice parameters.
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•The microstructure of triangular Au nanoplates was analyzed in fine detail by using precession electron diffraction (PED).•It was found that the nanoparticles are composed of a hexagonal phase in between two fcc phases.•The new discovered hexagonal phase have the following lattice parameters: a = 0.287 and c = 0.731 nm•The overlapping of hexagonal and fcc PED spots prevents the novel hexagonal Au phase atomic positions determination. |
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ISSN: | 1044-5803 1873-4189 |
DOI: | 10.1016/j.matchar.2020.110313 |