Infrared spectra of ammonium nitrate at high pressures and low temperatures |
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| Affiliation: | 1. Advanced Engineering Materials and Composites Research Centre (AEMC), Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Putra Malaysia (UPM), Serdang, Selangor, Malaysia;2. Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia;3. Department of Technology Management and Business, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Johor, Malaysia;4. Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia Serdang, Selangor, Malaysia;1. Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, 500046, India;2. Department of Physics, Faculty of Education, Al-Baida University, Al-Baida 38018, Yemen |
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| Abstract: | ![]()
Infrared spectra showing the symmetric stretching vibration band, γ1, of the nitrate ion (rendered weakly infrared active by the crystal field) were recorded for sample pressures up to 6 k bar at temperatures ranging between room temperature and liquid nitrogen temperature. A pressure-temperature phase diagram for the λ-transition of ammonium nitrate has been obtained. The spectra at low temperatures and low pressures are shown to be due to mixtures of phase IV and phase VII and the importance of long-range as well as short-range order is considered. |
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