Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals
We present results for high-resolution small-angle single-crystal X-ray diffraction of hard-sphere silica colloidal crystals. Our results indicate that the stacking probability a of finding an fee stacking sequence in a strongly compressed sample can only have two discrete values of either 0.5 (for...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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2005
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| _version_ | 1797079454321737728 |
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| author | Dolbnya, I Petukhov, A Aarts, D Vroege, G Lekkerkerker, H |
| author_facet | Dolbnya, I Petukhov, A Aarts, D Vroege, G Lekkerkerker, H |
| author_sort | Dolbnya, I |
| collection | OXFORD |
| description | We present results for high-resolution small-angle single-crystal X-ray diffraction of hard-sphere silica colloidal crystals. Our results indicate that the stacking probability a of finding an fee stacking sequence in a strongly compressed sample can only have two discrete values of either 0.5 (for rhcp) or 1 (for fcc) in contrast to previous observations on more dilute systems that metastable hard-sphere rhcp crystals may have various values of α. This suggests that, in a concentrated sample, the transition from rhcp to fee does not go by a smooth variation of α, but through a rearrangement mechanism via melting, which leads to the formation of perfect fee crystallites. These crystallites do not possess a single stacking fault as evidenced by the absence of twin fcc reflections. © EDP Sciences. |
| first_indexed | 2024-03-07T00:46:05Z |
| format | Journal article |
| id | oxford-uuid:84b49f49-1b60-4aff-86ae-79650800f70d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:46:05Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:84b49f49-1b60-4aff-86ae-79650800f70d2022-03-26T21:52:49ZCoexistence of rhcp and fcc phases in hard-sphere colloidal crystalsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:84b49f49-1b60-4aff-86ae-79650800f70dEnglishSymplectic Elements at Oxford2005Dolbnya, IPetukhov, AAarts, DVroege, GLekkerkerker, HWe present results for high-resolution small-angle single-crystal X-ray diffraction of hard-sphere silica colloidal crystals. Our results indicate that the stacking probability a of finding an fee stacking sequence in a strongly compressed sample can only have two discrete values of either 0.5 (for rhcp) or 1 (for fcc) in contrast to previous observations on more dilute systems that metastable hard-sphere rhcp crystals may have various values of α. This suggests that, in a concentrated sample, the transition from rhcp to fee does not go by a smooth variation of α, but through a rearrangement mechanism via melting, which leads to the formation of perfect fee crystallites. These crystallites do not possess a single stacking fault as evidenced by the absence of twin fcc reflections. © EDP Sciences. |
| spellingShingle | Dolbnya, I Petukhov, A Aarts, D Vroege, G Lekkerkerker, H Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title | Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title_full | Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title_fullStr | Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title_full_unstemmed | Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title_short | Coexistence of rhcp and fcc phases in hard-sphere colloidal crystals |
| title_sort | coexistence of rhcp and fcc phases in hard sphere colloidal crystals |
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