Hi Oz.

I´m far from a physicist or chemist and don´t wanna play teacher, but the combined materials are called III-V because of their placement at the periodic system of elements:

Ga = III, As = V

Anadigics mergerer is called II-VI: http://www.ii-vi.com

All the best to all of us for the months ahead (patience! months, not weeks!)

Holk