Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Granados-Fitch, M.G.; Melgoza, Juan Manuel Quintana; Juarez‐Arellano, Erick A.; Ávalos-Borja, M.

doi:10.1111/jace.15461

Cited by 10 publications

(3 citation statements)

References 36 publications

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“…Over less than two weeks, the surface of Re 0.85 B 2 becomes covered by several nanometers of perrhenic acid, taking into account that XPS depth resolution is in the order of a few nanometers and the B 1 s signal is undetectable. Orlovskaya et al .’s 23 hypothesis about and Granados-Fitch et al .’s 24 observation of formation of perrhenic acid during atmosphere exposure mechanically milled powders are confirmed here for thin films. There is no evidence for the formation of boric acid or ReO 3 in this corrosion stage.…”

Section: Resultssupporting

confidence: 79%

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Self-passivating (Re,Al)B2 coatings synthesized by magnetron sputtering

Bliem

Mráz

Sen

et al. 2018

Sci Rep

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(Re0.67Al0.10)B2 and (Re0.74Al0.11)B2 solid solution as well as Re0.85B2 thin films were deposited by hybrid RF-DC magnetron sputtering. X-ray diffraction (XRD) showed that all films exhibit the ReB2 (P63/mmc) crystal structure. X-ray photoelectron spectroscopy (XPS) analyses performed on atmosphere exposed thin film surfaces suggest that ReB2 corrodes, consistent with literature, by forming perrhenic acid (HReO4) already after two days, while (Re0.74Al0.11)B2 forms a self-passivating Al-oxide layer preventing corrosion in a time period ≥ 60 days. Hence, it is evident that Al additions to ReB2 significantly increase the chemical stability during atmosphere exposure.

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Section: Resultssupporting

confidence: 79%

“…Very recently, Granados-Fitch et al . 24 extended Orlovskaya et al .’s work by experimentally studying the reaction of mechanically milled powders in humid air over duration of 26 months. Theses ReB 2 powders decomposed entirely into HReO 4 (liquid), H 3 BO 3 , HBO 2 , and ReO 3 .…”

Section: Introductionmentioning

confidence: 71%

Self-passivating (Re,Al)B2 coatings synthesized by magnetron sputtering

Bliem

Mráz

Sen

et al. 2018

Sci Rep

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“…Therefore, the search for new methodologies is of great importance. High-energy ball-milling has proven to be a powerful technique for obtaining materials such as nitrides, carbides, borides, intermetallic and metastable phases [37][38][39][40][41][42][43][44]. Ball-milling has advantages such as easy operation, easy to scale industrially, short processing times, and that it could produce nanostructured powders.…”

Section: Introductionmentioning

confidence: 99%

Mechanosynthesis of β-Cr2N using BN as the nitrogen source

et al. 2022

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The mechanosynthesis of hexagonal chromium nitride (?-Cr2N) is explored by the high-energy ball-milling of Cr and h-BN. The ?-Cr2N onset formation is observed after 20 min of milling, although the complete reaction is achieved at 100 min of milling. Two different 1Cr:1BN and 2Cr:1BN molar ratios were evaluated, observing that the molar ratio plays an essential role in the end products during mechanosynthesis. The products were characterized by XRD, FTIR and Raman spectroscopy, thermal analysis (TGA and DSC), SEM, and surface area (BET). A preliminary phase stability map vs. accumulative energy (?Evaccum) has been constructed. The accumulative energy needed for the complete ?-Cr2N formation is ?Evaccum > 720 kJ/g.

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High‐Entropy‐Stabilized Platinum Diborides for Poison‐Resistant Catalysis

Rosenberg,

Li,

Zhang

et al. 2024

ChemCatChem

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Alloying and solid‐solution formation is a powerful technique that enhances and adds properties through elemental mixing, but unfortunately, some elements simply cannot mix as their chemical nature prevents a thermodynamically stable structure. For example, the inherent nobility of platinum group metals does not favor bond formation and precludes their incorporation into higher (boron‐rich) metal borides. Here, we demonstrate that when using five or more constituents, the higher mixing entropy will overcome these chemical limitations and form a stable high entropy alloy, demonstrating the formation of new compounds with substituents that are seemingly impossible with a traditional metal alloying approach. The high entropy boride (HEB) Al0.2Nb0.2Pt0.2Ta0.2Ti0.2B2 was synthesized where platinum was forced to occupy a 12‐coordinate site, sandwiched between honeycomb borophene sheets. In addition to the unusual coordination, the boron serves as a poison panacea. Pure platinum is strongly susceptible to sulfur poisoning by adsorption, rendering a platinum catalyst ineffective. Boron is known to be resistant to sulfur poisoning, the boron sheets present in the HEB shield the platinum from sulfur while maintaining high catalytic activity. This is confirmed with the facile hydrogenation of thiol‐containing nitro compounds where the HEB resists sulfur poisoning while retaining its high catalytic activity.

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Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Cited by 10 publications

References 36 publications

Self-passivating (Re,Al)B2 coatings synthesized by magnetron sputtering

Self-passivating (Re,Al)B2 coatings synthesized by magnetron sputtering

Mechanosynthesis of β-Cr2N using BN as the nitrogen source

High‐Entropy‐Stabilized Platinum Diborides for Poison‐Resistant Catalysis

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