Experiment
Near-infrared reflectance spectra at low temperature (110-290K) of delta, gamma and beta Diammonium hydrogen phosphate [(NH4)2HPO4] powders with three grain size ranges (32-80, 80-125 and 125-150µm)
Sub-Experiment
32-80 µm grain sizes
Sub-Experiment
Phase delta: 110-160K
Spectrum
Near-infrared reflectance spectra at 110K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 120K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 130K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 140K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 150K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 160K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 32-80µm grain size
Sub-Experiment
Phase delta-gamma transition: 170-173K
Spectrum
Near-infrared reflectance spectra at 170K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 171K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 172K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 173K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
Sub-Experiment
Phase gamma: 174-245K
Spectrum
Near-infrared reflectance spectra at 174K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 175K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 176K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 177K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 180K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 190K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 200K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 210K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 220K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 230K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 243K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 244K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 245K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 32-80µm grain size
Sub-Experiment
Phase beta 246-290K
Spectrum
Near-infrared reflectance spectra at 246K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 247K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 248K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 249K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 270K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Spectrum
Near-infrared reflectance spectra at 290K of Diammonium hydrogen phosphate-delta [(NH4)2HPO4] powder with 32-80µm grain size
Sub-Experiment
80-125 µm grain sizes (300K)
Sub-Experiment
Phase delta: 110-160K
Spectrum
Near-infrared reflectance spectra at 110K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 120K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 130K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 140K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 150K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 160K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 80-125µm grain size
Sub-Experiment
Phase gamma: 180-220K
Spectrum
Near-infrared reflectance spectra at 180K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 190K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 200K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 210K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 80-125µm grain size
Spectrum
Near-infrared reflectance spectra at 220K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 80-125µm grain size
Sub-Experiment
125-150 µm grain sizes (300K)
Sub-Experiment
Phase delta: 110-160K
Spectrum
Near-infrared reflectance spectra at 110K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 120K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 130K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 140K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 150K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 160K of Diammonium hydrogen phosphate-beta [(NH4)2HPO4] powder with 125-150µm grain size
Sub-Experiment
Phase gamma: 180-220K
Spectrum
Near-infrared reflectance spectra at 180K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 190K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 200K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 210K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 125-150µm grain size
Spectrum
Near-infrared reflectance spectra at 220K of Diammonium hydrogen phosphate-gamma [(NH4)2HPO4] powder with 125-150µm grain size
- Database
- Experimentalists
- Date
- 2021-10-29
- Thickness
- 4.5 $\pm$ 0.1 $mm$
- Diameter
- 18.0 $mm$
- Volume
- 1145.0 $mm^3$
- Mass
- 0.614 $\pm$ 0.005 $g$
- Surface roughness
- smooth
- Sample changes
- partly transformed to phase gamma of Diammonium hydrogen phosphate during warming to 172K
- Substrate material
- Aluminium
- Substrate comments
- cylindrical hole, diameter: 18 mm, depth: 4.5 mm
- Comments
- formed from phase gamma below 174K
- Temperature
- 172.0 $\pm$ 0.5 $K$
- Comments
- recording of the spectrum takes 62 min
- Type
- molecular gas
- Fluids
-
- $N_2$ 100.0 %
- Fluid temperature
- 172.0 $K$
- Fluid pressure
- 10.0 $mbar$
- Comments
- high purity N2 gas
- Number
- 1
- Layers
-
- Layer #1 , 4.5 $mm$