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EXAFS Study of the Local Order in Cu 2 ZnSn(S x Se 1– x ) 4 Alloys
Author(s) -
Pietnoczka Anna,
Bacewicz Rajmund,
Antonowicz Jerzy,
Schorr Susan,
Gurieva Galina
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900150
Subject(s) - extended x ray absorption fine structure , coordination number , crystallography , surface extended x ray absorption fine structure , absorption (acoustics) , debye–waller factor , short range order , diffraction , shell (structure) , chemistry , k edge , x ray crystallography , materials science , analytical chemistry (journal) , absorption spectroscopy , debye , ion , physics , optics , organic chemistry , chromatography , composite material
Local structure in Cu 2 ZnSn(S x Se 1– x ) 4 alloys is studied by the extended X‐ray absorption fine structure (EXAFS) method. K edge absorption spectra of four elements: Cu, Zn, Sn, and Se have been measured. The EXAFS analysis of the nearest neighbor shell is performed using simultaneous fitting of the data for all four K edges. This provides value of structural parameters in the most consistent way. The cation–anion interatomic distances exhibit the bimodal behavior, i.e., the Me–S and Me–Se distances (Me = Cu, Zn, and Sn) are practically constant over the whole composition range of Cu 2 ZnSn(S x Se 1– x ) 4 alloys. They are compared to the X‐ray diffraction (XRD) values for these alloys. The analysis of the EXAFS Debye‐Waller factors indicates differences in the static disorder around different cations with the lowest disorder observed in the first coordination shell of Sn atoms.