Probabilistic Analysis of Site-Occupation Preferences in Ga_{x}In_{1-x}As_{y}Sb_{1-y} and Cd_{1-x}Mn_{x}Se_{y}Te_{1-y} Quaternary Compounds

• Authors: B. Robouch , A. Kisiel
• Languages of publication: EN

Abstracts

EN

Site-occupation preferences in quaternary GaInAsSb and CdMnSeTe compounds in tetrahedrally coordinated zinc-blende structures are discussed. Probabilistic eigenfunctions are defined to determine individual component pair-populations from measured average-pair distributions. The methodology and possible traps in interpreting site-occupation preferences of published EXAFS experimental overall average-pair distributions are discussed. The approach allows a deeper understanding of individual pair selective preferences in semiconducting multinary compounds. EXAFS reported departures from Bernoulli random distributions point to changes within elemental tetrahedral average-populations. Resolution requires that for tetrahedral structures experimental data best-fit be a 4th degree polynomial, product of a parabola by the factor x(1-x). The analysis shows that both materials have a marked preference for elemental tetrahedra with odd numbers of competing species of ions around a central ion.

Keywords

EN

63.90.+t

Discipline

• 63.90.+t: Other topics in lattice dynamics (restricted to new topics in section 63)

• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 94
• Issue: 3
• Pages: 497-502

Dates

published

1998-09

Contributors

author

B. Robouch

• Guest, Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Frascati, CP.65, 00044 Frascati(RM), Italy

author

A. Kisiel

• Instytut Fizyki, Uniwersytet Jagielloński, Reymonta 4, 30-059 Kraków, Poland

Identifiers

DOI

10.12693/APhysPolA.94.497