Charge transfer in GaP and InP

their measurements. After analysirig the various experimental techniques for the charge transfer in these crystals, Cochran [9] stated that only X-ray diffraction and piezoelectric studies could give the sign and the magnitude of charge transfer, while optical studies give orily the magnitude. Saravarian et al. [lo to 131 have conducted X-ray diffraction studies on 111-V com- pound semiconductors like GaAs