I127 NQR spectra of Pb1–xCdxI2 and (BiI3)(1–x)(PbI2)x of mixed layered semiconductors

Abstract

The results of studying the concentration and temperature dependences of NQR spectrum parameters inherent to I127 in mixed layered semiconductors Pbx–1CdxI2 and (BiI3)(1–x)(PbI2)x are presented for x ≤ 0.30 and T = 77…150 K. It has been shown that, for the low content x ≤ 0.08 PbI2 for (BiI3)(1–x)(PbI2)x and x ≤ 0.02 CdI2 for Pb1–хCdxI2, the temperature coefficients of NQR frequency don’t undergo significant changes, which is indicative of conservation of the quasi-two-dimensional nature of the vibration states. The possibility to form nanoclusters of PbI2 and CdI2 as well as their influence on the parameters of the NQR spectra has been discussed.

Keywords

• layered semiconductors
• asymmetry para¬meter
• nuclear quadrupole resonance
• nanoclusters