Sample
Name
Al$_{2}$O$_{3}$, amorphous, KBr pellet, 1:500
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 $mbar$
Title
Preparation of a KBr pellet with amorphous aluminium oxide, KBr 1:500

Produced sample

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.