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A role of the semiconductor alloys in electronics and optoelectronics increases constantly. Since the electron-phonon interaction is main mechanism of the current carriers scattering in semiconductors it is important to recognize deeply the phonon spectra of the semiconductors solid solutions. The results on the semiconductor alloy FIR-spectra collected during 70, 80 and 90 decades have not been explained satisfactorily on base of simple “twomode behavior” for ternary and “three-mode behavior” for quaternary alloys. The previous reviews and books dedicated to the phonon spectra of semiconductor’s compounds (Barker & Sievers, 1975;Tylor,1988;Adachi,1999;Kosevich,1999) give not a reasonable answers on the questions concerning: whether the vibrations of different dipole pairs in the solid solution are connected in the alloy lattice and form a running wave (phonons) or on the contrary: they are disseminated on great number of local modes? Another one concerning of the solid solutions microstructure – geometry of chaos: whether this geometry factor is sufficient or thermodynamic one is necessary to add. The adequate describing of this geometry factor applying to the phonon spectra interpretation should be developed both for ternary alloys and quaternary also.

High Resolution Far Infrared Spectra of the Semiconductor Alloys Obtained Using the Synchrotron Radiation as Source