Phase transitions and H2O motions in [Ca(H2O)4](ClO4)2 studied by infrared spectroscopy, inelastic/quasielastic incoherent neutron scattering and proton magnetic resonance. Part II
✍ Scribed by Joanna Hetmańczyk; Anna Migdał-Mikuli; Edward Mikuli; Krystyna Hołderna-Natkaniec; Łukasz Hetmańczyk; Ireneusz Natkaniec
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 593 KB
- Volume
- 923
- Category
- Article
- ISSN
- 0022-2860
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We report the first quasi-elastic neutron scattering analysis of proton mobility in the solid electrolyte CaHPO 4 • 2H 2 O (brushite). We have studied this hydrated phosphate, in powder state, from 190 to 520 K, using an incident wavelength of 5.12 A s . The time of flight spectra are converted in S
Four phase transitions at: T h C1 ¼ 267:1 K, T h C2 ¼ 258:8 K, T h C3 ¼ 254:1 K and T h C4 ¼ 195:4 K (on heating) and at T c C1 ¼ 263:8 K, T c C2 ¼ 255:4 K, T c C3 ¼ 246:0 K (on cooling) were determined for [Ca(H 2 O) 4 ](ClO 4 ) 2 between 90 and 295 K by means of differential scanning calorimetry