B-O (Boron-Oxygen)

Predel, B.

doi:10.1007/10040476_372

Cited by 9 publications

(13 citation statements)

References 13 publications

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“…There are essentially three parameters controlling the structure of the metal-rich phases: (a) the metal stoichiometry; (b) the wt% of nitrogen in the CN matrix; and (c) the temperature of the pyrolysis process T f . The PtRh electrocatalysts show negligible alloying as Pt and Rh are not completely miscible at T < 760 • C, as confirmed from the PtRh phase diagram [37]. In other systems consisting of metal combinations based on Pd and Pt with Fe, Co and Ni, alloys are formed owing to the miscibility of the starting metals [38].…”

Section: Vibrational Spectroscopymentioning

confidence: 87%

Development of nano-electrocatalysts based on carbon nitride supports for the ORR processes in PEM fuel cells

Noto

Negro

2010

Electrochimica Acta

106

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Section: Vibrational Spectroscopymentioning

confidence: 87%

Development of nano-electrocatalysts based on carbon nitride supports for the ORR processes in PEM fuel cells

Noto

Negro

2010

Electrochimica Acta

106

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“…TEM investigations were not performed. Higher order magnesium boride secondary phases, expected to form due to the evaporation of highly volatile Mg [7], were not detected in the above investigations [5,6,16]. However, considering that very few grains out of a large number of grains in the sample are analysed by TEM and low x-ray scattering for light elements, both TEM and XRD might not detect the presence of secondary phases of higher magnesium borides.…”

Section: Introductionmentioning

confidence: 76%

“…Hypothetical [7] and calculated [13] phase diagrams show that for Mg mole fraction > 33 at.% MgB 2 is stable for temperatures less than 1545 • C at atmospheric pressure. The formation of secondary phases is not predicted by the phase diagram.…”

Section: Microstructure Of Pure Mgbmentioning

confidence: 89%

The Dehydrofluorination of Complexes of Silicon Tetrafluoride with Nitrogen- and Oxygen-containing Donor Ligands

Еннан¹,

Gavrilova²,

Gelmboldt³

1986

Russ. Chem. Rev.

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Al-alloyed MgB 2 was prepared by solid state reaction of Mg 1−x Al x alloy and crystalline B powder particles. The nominal composition of the samples was Mg 1−x Al x B 2 , with x = 0, 0.1, 0.2, and 0.3. Microstructure and chemical composition have been investigated by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and preliminary transmission electron microscopy (TEM). The Al concentration of the matrix is close to, but less than, the nominal Al concentration and the difference increases with increasing nominal Al concentration. Al is incorporated into MgB 2 grains of ∼1 µm size by substitution of Mg lattice sites with Al. Al was found to be distributed inhomogeneously, which partially explains the broadening of the superconducting transition width ( T c ) with increasing Al mole fraction. Al-alloyed samples contain large (∼15 µm) and small (∼2 µm) secondary phases embedded in the (Mg, Al)B 2 matrix. The composition of large secondary phases is found to be (Mg, Al)B 7+δ , with the mole fraction of excess boron (δ) increasing from 0.99 at.% in the pure sample to 4.14 at.% in the highest alloyed sample. The Al to Mg mole fraction ratio in these large secondary phases is about half of that in the matrix. The size and density of the large secondary phases increased with increase in Al mole fraction. The secondary phases constitute less than 4% of the total sample volume and are thus not likely to affect the bulk superconductivity. Magnesium diffusion and evaporation governed the formation of secondary phases and can be explained by considering the effects of annealing temperature, annealing time, and boron powder particle size.The residual resistivity (ρ 0 ) of pure MgB 2 (x = 0) and Al-alloyed MgB 2 (x = 0.1, 0.2, 0.3), measured by the four-probe technique is comparable to the single crystals, indicating the excellent quality of these samples. The lattice parameters c and a decrease at a rate of 1.15 pm and 0.17 pm/at.% Al, respectively. The superconducting transition temperature (T c ) determined by measuring the resistive superconducting transition decreases with increasing Al alloying at a rate of 1.56 K/at.% Al.

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“…The Au signal is statistically distributed over the entire sample. According to the Fe-Au phase diagram, the solubility of Au in Fe at 800 °C is around 1 at % [25]. This suggests that due to the low Au content, the solubility during the annealing is high enough to dissolve the Au in the Fe matrix.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and In Vitro Degradation of Sputtered Biodegradable Fe-Au Foils

2016

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Iron-based materials proved being a viable candidate material for biodegradable implants. Magnetron sputtering combined with UV-lithography offers the possibility to fabricate structured, freestanding foils of iron-based alloys and even composites with non-solvable elements. In order to accelerate the degradation speed and enhance the mechanical properties, the technique was used to fabricate Fe-Au multilayer foils. The foils were annealed after the deposition to form a homogeneous microstructure with fine Au precipitates. The characterization of the mechanical properties was done by uniaxial tensile tests. The degradation behavior was analyzed by electrochemical tests and immersion tests under in vitro conditions. Due to the noble Au precipitates it was possible to achieve high tensile strengths between 550 and 800 MPa depending on the Au content and heat treatment. Furthermore, the Fe-Au foils showed a significantly accelerated corrosion compared to pure iron samples. The high mechanical strength is close to the properties of SS316L steel. In combination with the accelerated degradation rate, sputtered Fe-Au foils showed promising properties for use as iron-based, biodegradable implants.

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B-O (Boron-Oxygen)

Cited by 9 publications

References 13 publications

Development of nano-electrocatalysts based on carbon nitride supports for the ORR processes in PEM fuel cells

Development of nano-electrocatalysts based on carbon nitride supports for the ORR processes in PEM fuel cells

The Dehydrofluorination of Complexes of Silicon Tetrafluoride with Nitrogen- and Oxygen-containing Donor Ligands

Mechanical Properties and In Vitro Degradation of Sputtered Biodegradable Fe-Au Foils

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