The local structure of ferroelectric Pb1-xGexTe

Citation
B. Ravel et al., The local structure of ferroelectric Pb1-xGexTe, J SYNCHROTR, 6, 1999, pp. 567-569
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SYNCHROTRON RADIATION
ISSN journal
09090495 → ACNP
Volume
6
Year of publication
1999
Part
3
Pages
567 - 569
Database
ISI
SICI code
0909-0495(19990501)6:<567:TLSOFP>2.0.ZU;2-5
Abstract
The narrow band-gap semiconductor Pb1-xGexTe has a low-temperature ferroele ctric rhombohedral phase whose average structure is a distorted rock salt s tructure. We have measured the Extended X-ray Absorption Fine-Structure spe ctra of Pb1-xGexTe with x approximate to 0.3 at the Ge and Te K edges and a t the Pb-III edge. Guided by first-principles calculations, we create a mod el for the the local structure as a distortion from the ideal rock salt str ucture. By co-refining the spectra from these three edges, we demonstrate t hat the data are consistent with our fitting model. Our results show the po wer of using first-principles calculations in conjunction with EXAFS measur ements to determine local structures in complex materials.