31. He claims that the ore he gave me is sperrylite ( platinum arsenide ). 32. He made electronic materials, such as gallium arsenide , that Nichia tried to sell. 33. Aluminium gallium arsenide ( AlGaAs ) is used in high-power infrared laser diodes. 34. The Mars Exploration Rovers and several satellites use triple junction gallium arsenide on germanium cells. 35. Indium gallium arsenide is a popular designation for gallium-indium arsenide ( GaInAs ). 36. Indium gallium arsenide is a popular designation for gallium-indium arsenide ( GaInAs ). 37. As the electrons hop between gallium arsenide quantum wells in the superlattice they emit phonons. 38. The normal pressure " sodium arsenide " phase is adopted by many alkali metal pnictides. 39. TriQuint makes radio frequency, analog and mixed signal gallium arsenide integrated circuits via proprietary technology. 40. Second to silicon, gallium arsenide ( GaAs ) is the second most popular semiconductor used.