Spectra of nuclear quadrupole resonance in vitreous semiconductors

The method of nuclear quadrupole resonance is used to study the chalcogenide semiconductors with compositions As2Se3 andAs(14)Sb(4)Se(27). It is shown that partial crystallization occurs in a sample of vitreous As2Se3 kept for a long time at room temperature; as a result, a change in the shape of the spectrum of the nuclear quadrupole resonance is observed. The As-75 spectrum in vitreous As14Sb4Se27 at a temperature of 77 K is measured for the first time. It is assumed that the Sb-121 or Sb-123 nuclei can contribute to the broad line of the quadrupole resonance. It is shown that the use of the nuclear spin-echo Fourier-transform mapping spectroscopy for reconstruction of very broad lines of the nuclear quadrupole resonance provides no advantages compared to the method of reconstruction based on the points in the integrated intensity of the echo signals.