X-ray diffraction study of the crystallization of amorphous FeBSiCuNb alloys

Mattern, N.; Danzig, A.; Müller, M.; Moldenhauer, S.; Blau, W.; Richter, K

doi:10.1002/pssa.2211380104

Cited by 2 publications

(1 citation statement)

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“…With larger local structural relaxations both in magnitude and spread, it may be anticipated that the RDF data are continuous, as observed. Furthermore, it is expected that diffraction based methods may be able to distinguish between these two RDF types since the experimental RDF analysis was shown to pinpoint stages of crystallization [46,47].…”

Section: Computational Detailsmentioning

confidence: 99%

Equilibrium structure of δ-Bi₂O₃from first principles

Mušić

Konstantinidis

Schneider

2009

J. Phys.: Condens. Matter

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Using ab initio calculations, we have systematically studied the structure of δ-Bi(2)O(3) (fluorite prototype, 25% oxygen vacancies) probing [Formula: see text] and combined [Formula: see text] and [Formula: see text] oxygen vacancy ordering, random distribution of oxygen vacancies with two different statistical descriptions as well as local relaxations. We observe that the combined [Formula: see text] and [Formula: see text] oxygen vacancy ordering is the most stable configuration. Radial distribution functions for these configurations can be classified as discrete (ordered configurations) and continuous (random configurations). This classification can be understood on the basis of local structural relaxations. Up to 28.6% local relaxation of the oxygen sublattice is present in the random configurations, giving rise to continuous distribution functions. The phase stability obtained may be explained with the bonding analysis. Electron lone-pair charges in the predominantly ionic Bi-O matrix may stabilize the combined [Formula: see text] and [Formula: see text] oxygen vacancy ordering.

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Section: Computational Detailsmentioning

confidence: 99%

Equilibrium structure of δ-Bi₂O₃from first principles

Mušić

Konstantinidis

Schneider

2009

J. Phys.: Condens. Matter

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Time-Resolved X-Ray Diffraction Studies on the Crystallization of Amorphous FeSiB-Based Alloys

Danzig¹,

Mattern²

1995

Phys. Stat. Sol. (a)

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The influence of separate and combined addition of Cu and Nb on the crystallization behaviour and the kinetics of Fe3Si formation in the system Fe77.5‐x‐ySi15.5B7CuxNby is investigated by means of X‐ray diffraction. Addition of Cu decreases the thermal stability of the amorphous matrix, the microstructure after crystallization is unchanged. Nb controls the microstructure. The onset of the two crystallization stages and the chemistry of the product of the second crystallization stage are dependent upon the concentration of Nb. Combined addition of Cu and Nb is responsible for coexistence of nanocrystalline Fe3Si precipitations and the amorphous matrix over a wide temperature range. The formation of Fe3Si is described in terms of Johnson‐Mehl‐Avrami kinetics (JMA). The Avrami exponent n is affected by addition of Cu, between 410 and 430 °C it is reduced from 1.4 to 0.7. On addition of Nb n is found to be ≈ 1. The combined addition of Cu and Nb results in an Avrami exponent n = 0.7 independent of annealing temperature (T = 475 to 600 °C).

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X-ray diffraction study of the crystallization of amorphous FeBSiCuNb alloys

Cited by 2 publications

References 13 publications

Equilibrium structure of δ-Bi₂O₃from first principles

Equilibrium structure of δ-Bi₂O₃from first principles

Time-Resolved X-Ray Diffraction Studies on the Crystallization of Amorphous FeSiB-Based Alloys

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X-ray diffraction study of the crystallization of amorphous FeBSiCuNb alloys

Cited by 2 publications

References 13 publications

Equilibrium structure of δ-Bi2O3from first principles

Equilibrium structure of δ-Bi2O3from first principles

Time-Resolved X-Ray Diffraction Studies on the Crystallization of Amorphous FeSiB-Based Alloys

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Equilibrium structure of δ-Bi₂O₃from first principles

Equilibrium structure of δ-Bi₂O₃from first principles