Revisiting the problem of crystallisation and melting of selenium
| Autor: | Shankar Ghosh, Mahesh Gokhale, Bhagyashree A. Chalke, Smita Gohil, Dinesh Kumar |
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| Rok vydání: | 2021 |
| Předmět: |
Persistence length
chemistry.chemical_classification Phase transition Materials science Infrared 02 engineering and technology Polymer Quantum entanglement Chemical vapor deposition 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention chemistry Chemical physics law 0103 physical sciences Deposition (phase transition) General Materials Science Crystallization 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Physics: Condensed Matter. 33:295402 |
| ISSN: | 1361-648X 0953-8984 |
| Popis: | In this paper, we study the structure of the solid selenium (Se) formed by the vapor deposition method. We provide direct visual evidence that faceted crystal-like shapes obtained from vapor phase deposition are a self-assembly of linear strands that have a persistence length of 10μm. These strands are held together by weak forces and can easily be separated. These chains occasionally get entangled to form chiral structures and often meander about destroying long range orientation and translation order in a continuous manner. Moreover, it is easy for the long strands of linear chains to slide past the neighboring ones, and hence the system has a large concentration of disinclination like defects in addition to the defects caused by the entanglement of the chains. Like organic polymers, the obtained Se structures also exhibit a spread in the melting temperature. This spread is closely related to the density of the sub-structures present in the system. The infrared imaging shows that these structures heat up in an inhomogeneous manner and the cross polarized images show that the process of melting initiates in the bulk. |
| Databáze: | OpenAIRE |
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