Abstract
The hydrous material Al(PO4)0.6O0.6·zH2O (AlPO) is studied in thin-film form to determine whether bulk diffusion or near-surface densification controls thermal dehydration. From X-ray reflectivity measurements, a dense surface crust is found to form on heating AlPO films. Capacitance-voltage measurements reveal the presence of mobile protons associated with trapped OH and H2O in the films. Deposition of a thin solution-processed HfO2 top coat on the AlPO film lowers the dehydration temperature by 250 °C. Characterization of the AlPO/HfO2 interface by medium energy ion scattering and transmission electron microscopy reveals little interdiffusion between the layers. The top coat affects densification of the near-surface region of the AlPO film, thereby amplifying water loss at low temperatures.
Original language | English |
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Pages (from-to) | 1081-1085 |
Number of pages | 5 |
Journal | ACS Sustainable Chemistry and Engineering |
Volume | 3 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 1 2015 |
Keywords
- Aqueous processing
- Electronic materials
- Oxide films
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment