Any facile method that you can explain, or a place where we can buy it would be great. If you are making one in your lab I'd like to buy that sample to study it a little bit.
Thanks to Radhwan, you may also use fine polymer granules or another volatile materials as space holders in powder techniques, without any applied pressure.
As I remember, I saw some papers in this area. Let me search my documents! ;)
In the meantime, I highly recommend you contact Prof. Banhart (from HZB). I know he has several experiences in this area. undoubtedly he can help you find or even provide you the needed sample:
http://www.helmholtz-berlin.de/people/banhart/
I will upload the papers, if I find them on my heavily loaded pc!