Infrared Lattice Vibrations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Ga</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">As</mml:mi></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">P</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Alloys

Verleur, H. W.; Barker, A. S.

doi:10.1103/physrev.149.715

Cited by 270 publications

(105 citation statements)

References 13 publications

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“…As generally reported, ternary tetrahedron coordinated A 1-x B x Z and AY y Z 1-y systems ( [12][13][14][15] for FIR and [16][17][18][19][20][21][22][23][24][25][26][27][28] for EXAFS), as well as balanced quaternaries of type A 1-x B x Y y Z 1-y (such as GaInAsSb [29] for EXAFS, CdMnSeTe [30] for EXAFS and [6,31] for FIR, analyzed in [32], ZnCdSeTe [33] for FIR), and unbalanced quaternary A 1-x-x′ B x′ C x Z (such as MnCdHgTe [34], ZnCdHgTe [35,36]), or AX y Y y′ Z 1-y-y′ system FIR spectra all exhibit SOPs; such preferences are linked to the thermodynamic properties of each system.…”

Section: Introductionsupporting

confidence: 65%

Statistical model analysis of local structure of quaternary sphalerite crystals

Robouch

Marcelli

Guidi

et al. 2007

Low Temperature Physics

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At the 2004 Ural International Winter School, we introduced the statistical strained tetrahedron model and discussed ternary tetrahedron structured crystals. The model allows one to interpret x-ray absorption fine structure (EXAFS) data and extract quantitative information on ion site occupation preferences and on the size and shape of each elemental constituent of the configuration tetrahedra. Here we extend the model to cover quaternary sphalerite crystal structures. We discuss the two topologically different quaternary sphalerite systems: the pseudo balanced A 1-x B x Y y Z 1-y (2:2 cation:anion ratio), and the unbalanced A x B x′ C 1-x-x′ Z or AX y Y y′ Z 1-y-y′ (3:1 or 1:3 cation:anion ratios) truly quaternary alloy systems. These structural differences cause preference values in pseudo quaternaries to vary with the relative contents, but to remain constant in truly quaternary compounds. We give equations to determine preference coefficient values from EXAFS or phonon spectra and to extract nearest-neighbour inter-ion distances by EXAFS spectroscopy. The procedure is illustrated and tested on CdMnSeTe, GaInAsSb, and ZnCdHgTe quaternary alloys. PACS: 61.43. Dq Amorphous semiconductors; metals and alloys.

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Section: Introductionsupporting

confidence: 65%

Statistical model analysis of local structure of quaternary sphalerite crystals

Robouch

Marcelli

Guidi

et al. 2007

Low Temperature Physics

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“…In Α1-x B x C and ΑC1-yDy ternary or A1-xBxC1-yDy quaternary compounds a basic question concerns a random or non-random substitution of the Α by B and C by D ions in respective sublattices. The first answer to this question has been obtained from infrared phonon mode analysis for GaΡl-yΑsy [1], CdS1-ySey [2], Cd1-x HgxΤe [3] and CdTe1-y Sey [4] ternary alloys. In all these experiments an additional feature in the infrared reflectivity spectrum has been observed and interpreted as a result of next nearest neighbours clustering [1][2][3][4].…”

mentioning

confidence: 99%

“…The first answer to this question has been obtained from infrared phonon mode analysis for GaΡl-yΑsy [1], CdS1-ySey [2], Cd1-x HgxΤe [3] and CdTe1-y Sey [4] ternary alloys. In all these experiments an additional feature in the infrared reflectivity spectrum has been observed and interpreted as a result of next nearest neighbours clustering [1][2][3][4]. The information concerning the partial clustering of ternary compounds have been also obtained from nuclear magnetic resonance in CdHgTe [5] and recently, in extended X-ray absorption fine stucture (EXAFS) analysis for diluted magnetic semiconduction ZnMnSe [6], as well as for non-magnetic quaternary In1-x Gax Sb1-y Asy alloys [7].…”

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confidence: 99%

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

et al. 1996

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The extended X-ray absorption fine structure (EXAFS) technique has been used to investigate the first shell coordination in zinc-blende quaternary In tetrahedrally coordinated III-V and II-VI semiconducting compounds there exist two sublattices occupied respectively by anions and cations. In Α1-x B x C and ΑC1-yDy ternary or A1-xBxC1-yDy quaternary compounds a basic question concerns a random or non-random substitution of the Α by B and C by D ions in respective sublattices. The first answer to this question has been obtained from infrared phonon mode analysis for GaΡl-and CdTe1-y Sey [4] ternary alloys. In all these experiments an additional feature in the infrared reflectivity spectrum has been observed and interpreted as a result of next nearest neighbours clustering [1][2][3][4]. The information concerning the partial clustering of ternary compounds have been also obtained from nuclear magnetic resonance in CdHgTe [5] and recently, in extended X-ray absorption fine stucture (EXAFS) analysis for diluted magnetic semiconduction ZnMnSe [6], as well as for non-magnetic quaternary In1-x Gax Sb1-y Asy alloys [7]. EXAFS analysis for ZnMnSe [6] shows that Zn-Mn coordination number is

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“…The statistical model of the optical dielectric function is applied to five GaAs y P 1-y (of type AY x Z 1-x ) FIR spectra [14] (see Fig. 4).…”

Section: Discussionmentioning

confidence: 99%

Statistical strained-tetrahedron model of local ternary zinc blende crystal structures

Robouch

Sheregii

Kisiel

2004

Low Temperature Physics

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The statistical strained-tetrahedron model was developed to overcome two common assumptions of previous models: 1) rigid undistorted ion sublattice of regular tetrahedra throughout all five configurations and 2) random ion distribution. These simplifying assumptions restrict the range of applicability of the models to a narrow subset of ternary alloys for which the constituent binaries have their lattice constants and standard molar enthalpies of formation (D f H 0 ) equal or quasi-equal. Beyond these limits predictions of such models become unreliable, in particular, when the ternary exhibits site occupation preferences. The strained-tetrahedron model, free from rigidity and stochastic limitations, was developed to better describe and understand the local structure of ternary zinc blende crystals, and interpret experimental EXAFS and far-IR spectra. It considers five tetrahedron configurations with the shape and size distortions characteristic of ternary zinc blende alloys, allows nonrandom distributions and, hence, site occupation preferences, conserves coordination numbers, respects stoichiometry, and assumes that next-neighbor values determine preferences beyond next-neighbor. The configuration probabilities have three degrees of freedom. The nineteen inter-ion crystal distances are constrained by tetrahedron structures; to avoid destructive stresses, we assume that the average tetrahedron volumes of both sublattices relax to equal values. The number of distance free-parameters £ 7. Model estimates, compared to published EXAFS results, validate the model. Knowing the configuration probabilities, one writes the dielectric function for far-infrared absorption or reflection spectra. Constraining assumptions restrict the number of degrees of freedom. Deconvolution of the experimental spectra yields site-occupation-preference coefficient values and/or specific oscillator strengths. Validation again confirms the model.

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Infrared Lattice Vibrations inGaAsyP1−yAlloys

Cited by 270 publications

References 13 publications

Statistical model analysis of local structure of quaternary sphalerite crystals

Statistical model analysis of local structure of quaternary sphalerite crystals

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

Statistical strained-tetrahedron model of local ternary zinc blende crystal structures

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