- Database
- Experimentalists
- Date
- 1995-01-01
- Thickness
- 1.0 $mm$
- Diameter
- 12.7 $mm$
- Mass
- 0.2 $g$
- Temperature
- 300.0 $\pm$ 5.0 $K$
- Temperature max
- 873.0 $K$
- Type
- ambient air
- Fluid temperature
- 300.0 $K$
- Fluid pressure
- 1000.0 $mbar$
- Number
- 1
- Layers
- Title
- Preparation of a KBr pellet with amorphous aluminium oxide, KBr 1:500
- Sample
- Al$_{2}$O$_{3}$, amorphous, KBr pellet, 1:500 (this sample)
- Processing steps
-
Step Chronology Date Type Process Changes #1 before layer formation mixing Batch for the sol-gel technique: mixing of the compounds aluminium secondary butoxide [Al(OCHCH$_{3}$CH$_{2}$CH$_{3}$)$_{3}$], ethylacetoacetate [CH$_{3}$COCH$_{2}$COOC$_{2}$H$_{5}$], propan-2-ol [C$_{3}$H$_{7}$OH] and H$_{2}$O; stirring the mixture for six months #2 before layer formation thermal Triggering of the batch by heat for gelling and drying at 383 K homogeneous gel was produced and dried #3 before layer formation thermal Annealing of the sol-gel product at 873 K to remove organic groups and water from the structure pure amorphous Al$_{2}$O$_{3}$ was produced, the amorphous state was approved by XRD, DTA, TG and NMR measurements #4 before layer formation mechanical Grinding the amorphous Al$_{2}$O$_{3}$ and seperation of the grain size fraction <1 µm by sedimentation in acetone production of a powder, grain size < 1 µm #5 before layer formation mixing Mixing the Al$_{2}$O$_{3}$ powder and KBr in a mass ratio of 1:500 #5 during layer formation pressure Production of a 200 mg KBr pellet under vacuum with a pressure equivalent of 10 tons pellet with 1.27 cm diameter and 200 mg - Comments
- The steps 1-3 comprise the sol-gel technique and were applied in the laboratory of Rüdiger Nass at the Institute for New Minerals, Saarbrücken.