The amorphous structure of the Fe–Ge system

Uemura, Osamu; Suzuki, Yuya; Satov, T.

doi:10.1002/pssa.2210410209

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…Evidence from electron diffraction patterns clearly establishes the formation of amorphous film during condensation of laser-ablated plasma from Fe-18 at% Ge and Fe-25 at% Ge targets. This result is consistent with earlier work on sputter deposition [21,22] or vacuum evaporation [23] of Fe-Ge alloys containing Ge565 at%. Compositional analysis shows that the glass is not completely homogeneous and variations in composition exist from region 314 K. Biswas et al Figure 5.…”

Section: Microstructure Evolution In Vapour-deposited Filmssupporting

confidence: 93%

Microstructural evolution and metastable phase formation in laser ablation-deposited films of Fe-rich Fe–Ge intermetallic compounds

Biswas

Das

Chattopadhyay

2007

Philosophical Magazine

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Thin films of Fe-rich Fe-18 at% Ge and Fe-25 at% Ge were deposited by a pulsed laser ablation technique on single crystal NaCl substrates at room temperature to study phase evolution using transmission electron microscopy. As-deposited films contain nano-scale clusters embedded in a featureless matrix. Quadrupole mass spectrometric observations of the laser-ablated plume show the presence of charged clusters. During in situ heating of the films, the fine-scale clusters grow and profuse crystallization to a bcc FeGe solid solution occurs. For Fe-25 at% Ge thin film, crystallized bcc grains undergo two ordering transitions, viz. bcc ! B2 ! DO 3 , during subsequent cooling to room temperature. However, in the case of Fe-18 at% Ge thin film, crystallization leads to formation of the disordered bcc phase. Growth morphologies of the crystals formed during heat treatment indicate faceted growth form, which has been explained by using Jackson's interface model.

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Section: Microstructure Evolution In Vapour-deposited Filmssupporting

confidence: 93%

Microstructural evolution and metastable phase formation in laser ablation-deposited films of Fe-rich Fe–Ge intermetallic compounds

Biswas

Das

Chattopadhyay

2007

Philosophical Magazine

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“…This blurring is due to the smaller concentration of Ge--Ge pairs but also to maxima due to the Mo--Mo pairs (at k -= 9.5 and 16.2 nm -i) and Ge--Mo pairs at k = 15 nm-1). This cha~ge in the diffracted intensity distribution is similar to and of the .~ame order of magnitude as that noticed in the a-GeAu, Cu [5], a-Ge-l~e [10] and a-Si--Fe [8] systems suggesting the similarity of these st~uctures. Characteristic changes show up with increasing x also in the regions k = 66 and 82 nm -1 in agreement with the experimental F(k)'s.…”

Section: [4~t Acta Phys~a ~4cademiae Scientiarum Hungarir 49~ 1980supporting

confidence: 57%

Structure and electrical properties of amorphous Ge−Mo films

et al. 1980

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Coevaporated amorphous Ge t xMOx fihns (0.07 < x < 0.32) were investigated by means of electron microscopy, electron and X-ray diffraction and electrical measurements. Inhomogeneity in the Mo concentration has been found only in the samp]es of high metal content.Mo canses drastic changes in the ED and XRD patterns of a-Ge. The experimental interference functions for x < 0.22 are well matched by those calculated on the basis of a structural model fora relaxed a-Ge random network in which the M9 atoms fill part of the empty spaee.In the range 80 470 K both samples with x ~ 0.07 and 0.16 display activation energies zlE 6 times less than those of a-Ge and close to k B T, which is indicative of hopping on high density localized states. Below 80 K for the samples of high Mo content 3E becomes very small suggesting the presence of metallie regions, which dominate conduction at low T.

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“…His coordination numbers were similar to those of c-FeGe2. Uemura, Suzuki & Satow (1977) tried to fit a microcrystalline model to electron diffraction data from evaporated a-Fe_Gel00-_ without success. They obtained a reasonable fit to experimental " data by modeling a-Fe40Ge60 as a severely distorted c-FeGe2 structure.…”

Section: Dense Random Packing Of Hard Spheresmentioning

confidence: 99%

Anomalous small angle x-ray scattering studies of amorphous metal-germanium alloys

Rice¹

1993

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This dissertation addresses the issue of composition modulation in sputtered ,, amorpnous metal-germanium thin films with the aim of understanding the intermediate range structure of these films as a function of composition. The investigative tool used in this work is anomalous small-angle X-ray scattering (ASAXS).The primary focus of this investigation is the amorphous iron-germanium (a-FexGel00-x) system with particular emphasis on the semiconductor-rich regime. Brief excursions are made into the amorphous tungsten-germanium (a-WxGeloo.x) and the amorphous molybdenum-germanium (a-MoxGeloo. x) systems. All three systems exhibit an amorphous structure over a broad composition range extending from pure amorphous germanium to approximately 70 atomic percent metal when prepared as sputtered films. Across this composition range the structures change from the open, covalently bonded, IIi tetrahedral network of pure a-Ge to densely packed metals. The structural changes are accompanied by a semiconductor-metal transition in all three systems as well as a ferromagnetic transition in the a-FexGeloo,x system and a superconducting transition in the a-MoxGe 100-x_ystem.A long standing question, particularly in the a-FexGel00, x and the a-MoxGe_oo, x systems, has been whether the structural changes (and therefore the accompanying electrical and magnetic transitions) are accomplished by homogeneous alloy formation or phase separation. Several structural analysis tools have already been applied to this question with limited, and in some cases contradictory, results.

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The amorphous structure of the Fe–Ge system

Cited by 15 publications

References 9 publications

Microstructural evolution and metastable phase formation in laser ablation-deposited films of Fe-rich Fe–Ge intermetallic compounds

Microstructural evolution and metastable phase formation in laser ablation-deposited films of Fe-rich Fe–Ge intermetallic compounds

Structure and electrical properties of amorphous Ge−Mo films

Anomalous small angle x-ray scattering studies of amorphous metal-germanium alloys

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