Luxpop will be happy to display in this space free of charge public service messages helpful to our users: requests for help, advice, equipment, jobs, resumes... Contact Guillaume at the following:
boissetg (at) luxpop.com

Variable atomic content compound

Quaternary materials

For quaternary materials such as InGaAsP or AlGaInAs, Luxpop assumes there is a lattice match to InP (indium phosphide). As such, there is no need to specify a value for y since entering a value for x will force a value of y to match the indium phosphide.

Other points

For H2SO4 (sulfuric acid) and HNO3 (nitric acid), x relates to the wt % of these substances in water. For example, x=0.4 for H2SO4 means a 40% ratio of H2SO4 by weight in an aqueous solution.