Electrical and optical properties as well as the EPR of PbTe:Eu single crystals before and after an IR laser emission treatment in the matrix transparency region have been studied. Parameters of the spin Hamiltonian for Eu2+ ions in PbTe have been determined. It has been established that the IR laser treatment has a considerable effect on PbTe:Eu characteristics, allowing properties of the crystals to be changed over a wide range. Thus, a change over in the conductivity type of the crystals from the p type (P77K=4*1018 cm-3) to the n type (up to N77K=1*1019 cm-3) was attainable. The application of the IR laser emission made it possible to reveal a HFS in EPR spectra of Eu2+ ions and to separate the lines corresponding to Eu isotopes 151Eu and 153Eu. The changes in the electrical characteristics and EPR spectra of the crystals investigated are attributed to decomposition under the action of the IR radiation of Eu-enriched complexes.
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