Lattice Dynamics of IV-VI Ionic Semiconductors: An Application to Lead Chalcogenides

Autor:	K.S. Upadhyaya, Mahendra Yadav, G.K. Upadhyaya
Rok vydání:	2002
Předmět:	Condensed matter physics Phonon Chemistry Doping Ionic bonding Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake Polarizability Dispersion relation symbols van der Waals force Raman spectroscopy Debye model
Zdroj:	physica status solidi (b). 229:1129-1138
ISSN:	1521-3951 0370-1972
DOI:	10.1002/1521-3951(200202)229:3<1129::aid-pssb1129>3.0.co;2-6
Popis:	A new model for studying the lattice dynamics of ionic and semiconducting crystals has been developed by incorporating the effects of van der Waals interactions (VWI), free-carrier doping (FCD) and three-body interactions (TBI) in the framework of the both-ions polarizable rigid shell model (RSM). This model (VFTSM) has been applied to calculate the phonon dispersion relations, Debye temperature variations and two-phonon infrared and Raman spectra of IV-VI ionic semiconductors (PbS, PbSe and PbTe). The excellent agreement between theory and experiment clearly shows that our model is superior to earlier models in explaining the dynamical behaviour of these crystals.
Databáze:	OpenAIRE
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