Azane fuel
The Azane fueled Jump Drive is a system attached to a normal jump drive to allow it to use Azane as a fuel source.
The Jump Drive normally uses Hydrogen in its operation of opening and sustaining the jump drive field during the duration. Normally the hydrogen is stored in it's liquid state (L-hyd) to obtain maximum fuel storage.
The idea behind using Azane (NH3) as a Jump Drive fuel was it would allow storing a much greater volume of hydrogen in a much smaller space. By volume liquid Azane holds about twice as much hydrogen as L-Hyd, though it weighs 100 times as much. In addition, it is much easier to handle becoming a liquid at 239.81°K rather than the 20.28°K required for hydrogen.
The difficulty in using Azane has always been the processing step. Decomposing Azane into its component parts isn't difficult, requiring the application of a modest amount of heat. But the Jump drive relies upon the Hydrogen being in its liquid state. There is not yet a method of cooling the hot byproducts of the Azane decomposition fast enough for use in the Jump Drive.
There have been several experimental starship designs which would use Azane as a fuel storage system, relying upon a several hour layover between jumps to process the fuel. Usually these designs were for rift crossing, or as spy ships which may not be able to rely upon traditional refueling methods.