Stability of α''-Fe16N2 in hydrogenous atmospheres.
نویسندگان
چکیده
We revealed the inherent instability of α''-Fe16N2 in hydrogenous atmospheres due to the denitrification toward α-Fe by forming NH3 at the particle surface. Coating the particle surface with SiO2 to suppress the formation of NH3 has proven to be a simple yet powerful method to enhance the stability of α''-Fe16N2 in hydrogenous atmospheres.
منابع مشابه
Quantitative understanding of thermal stability of α''-Fe16N2.
The thermal stability of α''-Fe16N2, which attracts much interest because of its superior magnetic properties featuring a large magnetocrystalline anisotropy (Ku ~ 1 × 10(7) erg cm(-3)) and a large saturation magnetization (Ms ~ 234 emu g(-1)), though unfortunately thermally unstable, has been quantitatively studied.
متن کاملMössbauer and Magnetic Investigation of Iron Nitride with Martensite Structure Synthesised from Oxy-hydroxide Type Precursor
Fe16N2 fine particles were prepared by reduction in 5% H2/Ar gas mixture flow, starting from goethite or hematite precursors, followed by nitridation in ammonia gas flow. Small amounts of metallic iron and iron oxide are present besides the main phase which is an ordered iron nitride having martensite structure (α ’’ -Fe16N2) as revealed by Mössbauer spectroscopy measurements. However, X-ray di...
متن کاملTheory of giant saturation magnetization in α''- Fe16N2: role of partial localization in ferromagnetism of 3d transition metals
A new model is proposed for the ferromagnetism associated with partially localized electron states in the Fe16N2 system that explains its giant saturation magnetization. It is demonstrated that an unusual correlation effect is introduced within the Fe–N octahedral cluster region and the effective onsite 3d–3d Coulomb interaction increases due to a substantial 3d electron charge density differen...
متن کاملPhotodecomposition of direct red 81 (5-solamin) by using nano sized zinc oxide deposited on glass beads in neutral and alkaline pH and various atmospheres
This research describes photo degradation of direct red 81(5-solamin) in the presence of zinc oxide nano-sized catalyst supported on granule glass under UV light irradiation. The effects of some parameters such as various pH and different atmosphere on photo degradation efficiency were studied. After various experiments it was revealed that among various atmospheres, at neutural medium, oxygen ...
متن کاملPreconditioning of the YSZ-NiO Fuel Cell Anode in Hydrogenous Atmospheres Containing Water Vapor
The YSZ-NiO ceramics for solid oxide fuel cells (SOFCs) anode have been investigated. A series of specimens were singly reduced in a hydrogenous atmosphere (Ar-5 vol% H2 mixture) at 600 °C under the pressure of 0.15 MPa or subjected to 'reduction in the mixture-oxidation in air' (redox) cycling at 600 °C. The YSZ-Ni cermets formed in both treatment conditions were then aged in 'water vapor in A...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Chemical communications
دوره 50 53 شماره
صفحات -
تاریخ انتشار 2014