EXAFS of Cd1−xZnxTe: A test of the random distribution in zincblende ternary alloys

Motta, Nunzio; Balzarotti, A.; Letardi, P.; Kisiel, A.; Czyżyk, M. T.; Zimnal-Starnawska, M.; Podgórny, M.

doi:10.1016/0038-1098(85)90180-2

Cited by 69 publications

(32 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microscopic, local structural information obtained by extended x-ray absorption fine-structure studies (EXAFS) of several alloys have indeed established beyond doubt that the first near-neighbor bond lengths [2][3][4], A-C and B-C, remain close to their values in the corresponding end-members instead of adopting a single average value. In a few reports, such analyses were extended up to the higher coordination shells [4,[43][44][45][46][47][48][49] to check if such discrepancies exist at longer interatomic distances. Distortions induced in a system due to doping not only affects the interatomic distances but also the angles contained by them, which tend to buckle accordingly [2,[50][51][52][53][54][55], deviating from their ideal bond angle values.…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of the evolution of the local structure and an evaluation of the chemical pressure concept in a solid solution

et al. 2014

View full text Add to dashboard Cite

Extended x-ray absorption fine-structure studies have been performed at the Zn K and Cd K edges for a series of solid solutions of wurtzite Zn 1−x Cd x S samples with x = 0.0, 0.1, 0.25, 0.5, 0.75, and 1.0, where the lattice parameter as a function of x evolves according to the well-known Vegard's law. In conjunction with extensive, large-scale first-principles electronic structure calculations with full geometry optimizations, these results establish that the percentage variation in the nearest-neighbor bond distances are lower by nearly an order of magnitude compared to what would be expected on the basis of lattice parameter variation, seriously undermining the chemical pressure concept. With experimental results that allow us to probe up to the third coordination shell distances, we provide a direct description of how the local structure, apparently inconsistent with the global structure, evolves very rapidly with interatomic distances to become consistent with it. We show that the basic features of this structural evolution with the composition can be visualized with nearly invariant Zn-S 4 and Cd-S 4 tetrahedral units retaining their structural integrity, while the tilts between these tetrahedral building blocks change with composition to conform to the changing lattice parameters according to the Vegard's law within a relatively short length scale. These results underline the limits of applicability of the chemical pressure concept that has been a favored tool of experimentalists to control physical properties of a large variety of condensed matter systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Microscopic description of the evolution of the local structure and an evaluation of the chemical pressure concept in a solid solution

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Theoretical predictions such as alloy structural disorder due to the bond relaxation [9], have been confirmed by extended X-ray-absorption fine structure (EXAFS) measurements of nearest-neighbour distances for Cd 1−x Zn x Te [10]. According to the work of Comedi and Kalish [11], the thermal vibrational amplitudes are expected to be determined mainly by the bonding properties of the crystal and not by dislocation kinetics.…”

Section: Introductionmentioning

confidence: 77%

Predictions of the bonding properties inCd1−xZnxTe

Merad

Aourag²,

Khelifa

et al. 2001

Superlattices and Microstructures

View full text Add to dashboard Cite

“…Evolution of the bond length with changing composition is more pronounced in the mixed crystals containing Zn. This effect was observed and discussed in several systems like Zn 1−x Hg x Te [48], Zn 1−x Mn x Se [49], Zn 1−x Mn x Te [50,51], and Cd 1−x Zn x Te mixed crystals [44,[52][53][54][55]. At least the recent experimental data for Cd 1−x Zn x Te clearly suggest also a non-linear variation of the bond lengths with the mixed crystal composition [55].…”

Section: The Effect Of the Mixed Crystal Compositionmentioning

confidence: 87%

Are values of parameters describing magnetic properties of crystal really fixed?

Szuszkiewicz

Dynowska

2005

Journal of Alloys and Compounds

View full text Add to dashboard Cite

EXAFS of Cd1−xZnxTe: A test of the random distribution in zincblende ternary alloys

Cited by 69 publications

References 5 publications

Microscopic description of the evolution of the local structure and an evaluation of the chemical pressure concept in a solid solution

Microscopic description of the evolution of the local structure and an evaluation of the chemical pressure concept in a solid solution

Predictions of the bonding properties inCd1−xZnxTe

Are values of parameters describing magnetic properties of crystal really fixed?

Contact Info

Product

Resources

About