Formation and stability of amorphous molecular systems: As the prototype of functional amorphous organic materials |
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| Institution: | 1. Department of Physics, Indian Institute of Science, Bangalore, India;2. Department of Material Science and Engineering, Lehigh University, Bethlehem, PA, USA;3. Alfred University, New York State College of Ceramics, Alfred, NY, USA;4. Corning Incorporated, Corning, NY, USA;5. Department of Instrumentation, Indian Institute of Science, Bangalore, India;6. Materials Research Centre, Indian Institute of Science, Bangalore, India |
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| Abstract: | Structural changes in vapor-deposited amorphous states of simple organic compounds were studied by Raman scattering, X-ray diffraction, and light interference in the sample. Two types of processes, namely direct crystallization and structural relaxation leading to glass transition, were observed depending on the flexibility of the molecule. Gradual relaxations were also found to occur in amorphous states of butyronitrile and 1,2-dichloroethane at temperatures much lower than their Tg or crystallization temperature. The observed structural changes are discussed by referring to the high enthalpy of the vapor-deposited amorphous systems. |
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