Band gaps, Eg(eV)

Diamond	5.47
GaN	3.452
GaAs	1.423

gamma-Si3N4	5.05	(optical spectroscopy)
gamma-Ge3N4	3.65	(optical spectroscopy)

gamma-Si3N4	4.8	(SXS)
gamma-Ge3N4	3.5	(SXS)
gamma-Sn3N4	1.6	(SXS)


