Phase equilibria in the Al–Mo–Si system

Ponweiser, Norbert; Paschinger, Werner; Ritscher, Anna; Schuster, Julius C.; Richter, Klaus W.

doi:10.1016/j.intermet.2010.11.010

Cited by 20 publications

(12 citation statements)

References 22 publications

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“…The notion about LaCuAl 3 being disordered can be further supported by 27 Al NMR spectra of both samples (see Fig. 5 and 6).…”

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 60%

“…Nuclear magnetic resonance spectra of 139 La, 27 Al, and 65 Cu nuclei were measured by Bruker Avance II spectrometer at room temperature in 9.4 T static magnetic field. The frequency-swept spectra were acquired by a modified Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence where all (up to 50) induced spin echoes were coherently summed and their sum Fourier transformed.…”

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 99%

“…Al enters at least two nonequivalent sites even in the "ordered" I4mm structure str01, and above that, the Al(4b) sites lack local axial symmetry, i.e., η can be non-zero and acts as another free parameter. Therefore, the approach of independently simulating the NMR spectra as applied for 139 La is more difficult to implement for 27 Al. For LaAuAl 3 the most of the spectral features can still be captured Natural question then arises why the behavior of LaCuAl 3 and LaAuAl 3 is so different, i.e., why LaCuAl 3 is more disordered than LaAuAl 3 .…”

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 99%

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Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Chlan

Doležal²,

Sgallová³

et al. 2019

J. Phys.: Condens. Matter

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CeCuAl 3 and CeAuAl 3 , crystallizing in the non-centrosymmetric BaNiSn 3 tetragonal structure, are known mainly for their unusual neutron scattering spectra involving additional excitations ascribed to vibron quasi-bound quantum state in CeCuAl 3 and anti-crossing of phonon and crystal field excitations in CeAuAl 3 . In this work, we present results of nuclear magnetic resonance experiments on their lanthanum analogues -LaCuAl 3 and LaAuAl 3 . The character of nuclear magnetic resonance spectra of 139 La, 27 Al, and 65 Cu measured in LaAuAl 3 and LaCuAl 3 is dominated by electric quadrupole interaction. The spectral parameters acquired from experimental data are confronted with values obtained from the electronic structure calculations. The results show remarkable differences for the two compounds. The 139 La spectrum in LaAuAl 3 can be interpreted by a single spectral component corresponding to uniform environment of La atoms in the crystal structure, whereas for LaCuAl 3 the spectrum decomposition yields a wide distribution of spectral parameters, which is not possible to explain by a single La environment, and multiple non-equivalent La positions in the crystal structure are required to interpret the spectrum.arXiv:1811.02871v1 [cond-mat.mtrl-sci]

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“…The notion about LaCuAl 3 being disordered can be further supported by 27 Al NMR spectra of both samples (see Fig. 5 and 6).…”

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 60%

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 99%

Section: Polycrystalline Samples Of Lacualmentioning

confidence: 99%

See 1 more Smart Citation

Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Chlan

Doležal²,

Sgallová³

et al. 2019

J. Phys.: Condens. Matter

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“…These values correspond to a 3/2 atomic ratio of ((9/13)Mo+ (4/13)Nb)/Si or ((9/13)Mo+(4/13)Nb) 3 Si 2 . Mo 3 Si 2 and Nb 3 Si 2 are metastable phase of MoSi and NbSi systems, respectively [25,26]. These regions remained scattered in the MoSi 2 matrix thus a Si-decient phase did not form in Nb-containing samples beneath the oxide layer as it did in pure MoSi 2 .…”

Section: Methodsmentioning

confidence: 99%

Effects of Nb-Alloying on High-Temperature Oxidation of MoSi₂

Sharif

2014

Acta Phys. Pol. A

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The eects of alloying with 0.5, 1.0, and 2.0 at.% Nb on oxidation resistance of MoSi2 are investigated at temperature range of 1400• C1700• C. Rapid formation of a stable protective layer of silica resulted in a parabolic oxidation rate. The oxide layer thickness and the sample weight increased with increasing oxidation time. Impurities accelerated oxidation rate of MoSi2 only slightly, however, did not aect the rate controlling mechanism for oxidation. There was no correlation between oxidation rate and the amount of impurity. The values of activation energies for oxidation of pure MoSi2 and Nb-alloyed samples were similar to activation energy for diusion of O2 through silica. Diusion of O2 through the oxide scale remained the rate controlling mechanism with or without Nb impurity.

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“…Also, MoSi 2 is a promising material against oxidation at temperatures beyond 1,473 K due to the formation of a protective, glassy silica (SiO 2 ) layer on the surface [8]. However, it suffers from pest disintegration at a lower temperature range between 773 and 973 K, where the material is disintegrated into powders due to the generation of internal stresses during differential expansion of oxides [9,10]. At present, the mechanical alloying technology is used to prepare the MoSi-B and the Mo-Si-Al alloys and studies show that B and Al can improve the mechanical properties of MoSi 2 to some extent [11], but cannot improve the low-temperature oxidation resistance of coating, and cannot fundamentally solve the thermal stress mismatch problem between matrix material and coating [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and phase transformation behavior of Mo–MoSi2 gradient material

Yonghong

Shi

2014

Rare Met.

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Mo-MoSi 2 gradient coating on Mo substrate was prepared by siliconizing process, using the polysilicon as silicon atoms. The gradient layer was analyzed by the experimental results, theoretical analysis, and thermodynamic calculation. The silicon, molybdenum content of gradient coating shows a gradual change regulation. The reaction between silicon and molybdenum is most likely to generate Mo 5 Si 3 , then MoSi 2 , finally Mo 3 Si, but when the silicon content is excessive, the Mo 5 Si 3 and Mo 3 Si will react with silicon and generate MoSi 2 . The gradient layer is mainly constituted by Si and MoSi 2 , only about 1/10 gradient layer is constituted by Mo 5 Si 3 and Mo 3 Si, and the stable existences of Mo 5 Si 3 and Mo 3 Si are mainly determined by the silicon content. Along the Mo substrate to the surface of the coating, the phase composition of gradient coating changes as follows: Mo ? transition layer, Mo (main phase) ? Mo 3 Si ? Mo 5 Si 3 ? intermediate layer, and MoSi 2 (main phase) ? Mo 5 Si 3 ? Si ? surface layer MoSi 2 (main phase) ? Si, and the experimental temperature has no effect on phase composition of gradient coating.

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Phase equilibria in the Al–Mo–Si system

Cited by 20 publications

References 22 publications

Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Effects of Nb-Alloying on High-Temperature Oxidation of MoSi₂

Microstructure and phase transformation behavior of Mo–MoSi2 gradient material

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Phase equilibria in the Al–Mo–Si system

Cited by 20 publications

References 22 publications

Local atomic arrangement in LaCuAl3 and LaAuAl3 by NMR and density functional theory

Local atomic arrangement in LaCuAl3 and LaAuAl3 by NMR and density functional theory

Effects of Nb-Alloying on High-Temperature Oxidation of MoSi2

Microstructure and phase transformation behavior of Mo–MoSi2 gradient material

Contact Info

Product

Resources

About

Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Local atomic arrangement in LaCuAl₃ and LaAuAl₃ by NMR and density functional theory

Effects of Nb-Alloying on High-Temperature Oxidation of MoSi₂