An EXAFS study of the structure of the Zn<sub>1-x</sub>Be<sub>x</sub>Se alloy system

Ganguli, Tapas; Mazher, Javed; Polian, A.; Deb, S. K.; Pagès, O.; Firszt, F.

doi:10.1088/1742-6596/190/1/012064

Cited by 5 publications

(4 citation statements)

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“…e second peak which is observable in Figure 4(c) at the R value of ∼3.4 Å is due to the contribution of the Be and Zn atoms of the second shell. We have observed a systematic displacement pattern among the second peak positions in the R-space that displaces in the range of 3.2 to 3.5 Å due to manifestations of Zn−(Be, Se) multibond-length behaviors [11,12].…”

Section: Resultsmentioning

confidence: 91%

“…From Ganguli et al 's previous studies [11,12] on the highpressure EXAFS, we lead to a verdict of pressure dependence of the nearest and the next nearest neighbor distances of Zn (or Be) and Se atoms and pseudo-Debye-Waller factor 2 on such binary and ternary systems. However, factors that determine the dependence of these parameters as a function of the alloy composition have not been yet explored fully.…”

Section: Introductionmentioning

confidence: 73%

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Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

2013

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Solid solution hardening can be introduced in the zinc selenide by cationic substitution alloying. We are presenting our studies on gradual development of the hardening and the bond-length variations among the heavily Be-doped ternary alloys of Zn 1 Be Se. ese compositionally vivid ternary systems are grown by the Bridgman technique, and a set of careful measurements of synchrotron-based Zn core X-ray absorption spectroscopy are performed on the mixed alloy, which is followed by extraction of useful oscillations of extended X-ray absorption �ne structures. A detailed ab initio analysis is also carried out for the mixed alloy's theoretical EXAFS simulations, and suitable data processing codes are used for the subsequent experimental spectra �ttings. Various X-ray scattering single and multiple paths around the core atomic environ are simulated and compared with the spectroscopic results. With the aid of as-found parametric values, the hardening and crystalline disorders are discussed and explained in the midst of the multimodal bond-length behaviors and changes induced by the increased alloying amid as-found pseudocrystalline stabilities.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 73%

Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

2013

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“…This can be ascribed to occurrence of a local disorder, originated due to the high bond length contrast amongst the Zn−Se and the Be−Se bonds. 9 Similarly, the compositional change in FWHM can only be attributed to the Be doping induced disorder in the alloy as we have kept constant temperature (room temperature, 300 K) throughout the X-ray absorption spectroscopy. In addition, the recent theoretical calculations also predict a novel bond contrast related percolation -leading to the formation of either Be atomic chains or Zn atomic chains -within the Zn 1−x Be x Se tetrahedral, which is also found to broadened the FT peak widths.…”

Section: Resultsmentioning

confidence: 99%

“…6,7 On the contrary, the substitutional addition of Be also promotes a high bond length contrast that consecutively induces some novel structural properties in the resulting Be x Zn 1−x Se solid solution. 8,9 It is important to note that the bond lengths of bulk zinc selenide (∼2.45Å) and bulk beryllium selenide (∼2.1Å) differ by ∼17%; the Be-Se bond is shorter and stiffer than the Zn-Se bond. Lots of present scientific endeavors are therefore dedicated towards the objective of studying the localized nature of the hardening and the bond character in this new class of mixed alloy mainly by using the local structural probes like extended X-ray absorption fine structures (EXAFS), however the research claims are often contradictory in nature due to the complicated procedure of the fine structure extraction.…”

Section: Introductionmentioning

confidence: 99%

EXAFS studies of novel impulsive hardening in the Be–Zn–Se semiconductor alloys

2014

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Beryllium doping has been used to harden the inherently soft zinc-selenides semiconductor mixed alloys. Stoichiometric semiconductor ternary alloys of BexZn 1−x Se have been synthesized by the Bridgeman technique. Extended X-ray absorption fine structure (EXAFS) spectroscopy -in a state-of-art synchrotron-based method -is performed by varying the dopant Be concentration of Be from 6% to 55% in the zinc-selenide host semiconductor. EXAFS analyses is carried out to study the next neighbor and next nearest neighbor atomic positions, nature of the substitutional doping, extent of bond length homogeneity, presence of involuntary contrast among the path distances, and the cross over from soft to hard character of the ternary on increasing Be concentration.Our results indicate the presence of an impulsive nature of hardening in the ternary with a disparity at the lower and the higher doping levels. The observation of impulsive hardening of the substitutional dopants in the semiconductor lattice is explained by the help of self-accommodative attributes of the host lattice.

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High pressure x-ray diffraction and extended x-ray absorption fine structure studies on ternary alloy Zn1−xBexSe

Bhalerao

Polian

Gauthier

et al. 2010

Journal of Applied Physics

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International audienceThe ternary semiconductor alloy Zn1−xBexSe has been studied under high pressure by x-ray diffraction and extended x-ray absorption fine structure EXAFS at the Zn and Se K-edge in order to determine the bulk and bond-specific elastic properties. Our measurements on samples with x =0.06–0.55 show pressure induced phase transformation from zinc blende to NaCl. The phase transformation pressure increases linearly with x. Murnaghan equation of state fitting to the data yields the unit cell volume at ambient pressure and bulk modulus, both of which follow the Vegard's law. Nearest neighbor bond distances derived from EXAFS do not show sharp phase transition except for x=0.06. Bond modulus derived for the Zn–Se bonds shows them to be apparently stiffer than the bulk alloy, which is nontrivial. This tendency increases with increasing x and a strong positive bowing from the Vegard's law is observed. We attribute the observed anomalies to the contrastingly different properties of the two components ZnSe and BeSe

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An EXAFS study of the structure of the Zn_1-xBe_xSe alloy system

Cited by 5 publications

References 10 publications

Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

EXAFS studies of novel impulsive hardening in the Be–Zn–Se semiconductor alloys

High pressure x-ray diffraction and extended x-ray absorption fine structure studies on ternary alloy Zn1−xBexSe

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An EXAFS study of the structure of the Zn1-xBexSe alloy system

Cited by 5 publications

References 10 publications

Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

EXAFS studies of novel impulsive hardening in the Be–Zn–Se semiconductor alloys

High pressure x-ray diffraction and extended x-ray absorption fine structure studies on ternary alloy Zn1−xBexSe

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An EXAFS study of the structure of the Zn_1-xBe_xSe alloy system