Geoscience Reference
In-Depth Information
the schematic diagram of the autoclave designed by Jacobs and Schmidt
[99]
to work
in the region of supercritical ammonia. The autoclave is made up of a special alloy
vacumelt ATS 340. Above 527
C, this alloy begins to flow. On the other hand, the
workability of this alloy is quite difficult. The closing mechanism is a Bridgman-type
closing, and the sealing rings are usually made up of copper or brass. Chalcogenides
and polychalcogenides can also be synthesized by the reaction of the alkali metals with
sulfur, selenium, or tellurium in ammonia under high pressure. Similarly, some hydro-
xides and hydrosulfides can be synthesized. Besides the synthesis, the ammonothermal
technique has potential in the treatment or disintegration of organic compounds.
Microautoclave
Yamasaki and coworkers
[100]
have developed a microautoclave lined with
Inconel-600 with a reaction chamber volume of 18 ml for hydrothermal oxidation
studies. The oxygen gas can be charged into the reaction chamber through the
Figure 3.34 Schematic diagram of the
microautoclave
[100]
.
1
1. High-pressure valve
2. Well for thermocouple
3. Liner
4. Chamber
5. Stirring ball
6. Cone
7. Binding nut
2
3
4
5
6
7
