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Structural relaxation between high-density and low-density amorphous ice: an X-ray and neutron diffraction study
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tulk, Christopher Alexander Benmore, Chris J. Klug, Dennis D. Uquirdi, J. Tomberli, Bruno Neuefeind, Joerg C. Egelstaff, P. A. |
| Copyright Year | 2002 |
| Abstract | High-density amorphous ice, prepared by compression of ice I, has been annealed isothermally for several hours at 95, 100, 105 and 115 k and structural changes have been continuously monitored using synchrotron x-ray and neutron diffraction techniques. During each anneal structural changes are indicated by changes in the first sharp diffraction peak position in the static structure factor. During each anneal the peak position is initially observed to rapidly change position toward the LDA phase, however, at each anneal temperature the transformation is observed to stop before completion of the HDA to LDA transition, resulting in several metastable intermediate phases. The structure of these intermediate phases were then temperature quenched by rapidly cooling the sample to 40 k, thus allowing detailed S(Q) and G(r) functions to be determined. It is shown that each intermediate phase is unique and the static structure factor functions cannot be reproduced by any linear combination of the measured s(Q) of HDA and LDA. These studies also represent the first comparison of data collected using synchrotron x-ray and neutron diffraction from subsections of the same sample. Using this technique we have quench recovered a total of three metastable intermediate phases, with the implication that there are and infinite number of possible states, thus indicating that the HDA to LDA transition at zero pressure is much more complicated than first thought. |
| Starting Page | 53 |
| Ending Page | 53 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1107/S0108767302087202 |
| Alternate Webpage(s) | http://journals.iucr.org/a/issues/2002/s1/00/a29895/a29895.pdf |
| Alternate Webpage(s) | https://doi.org/10.1107/S0108767302087202 |
| Volume Number | 58 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
