Fe-As-based high-temperature

SOME MOSSBAUER STUDIES OF Fe-As-BASED HIGH-TEMPERATURE SUPERCONDUCTORS... 

Badami AS, Roy A, Lee HS, Li Y, McGrath JE. Morphological investigations of disulfonated poly(arylene ether sulfone)-fe-naphthalene dianhydride-based polyimide multiblock copolymers as potential high temperature proton exchange membranes. J Membr Sci 2009 328 (l-2) 156-64. 

Prior to 1960, the same type of catalyst was used in both steps. This catalyst is mainly iron and chromium oxides, about 55% Fe, and 6% Cr. It is active only at relatively high temperatures (350 -430°C) and is known as a high-temperature shift (HTS) catalyst. About 1960 a new copper-based catalyst came into use, which is active at lower temperatures (200 -260 C) and is known as low-temperature shift (LTS) catalyst. Most LTS catalysts contain zinc and alumina in addition to copper and are poisoned by sulfur and chlorine compounds. 

None of the biaary compounds with this composition is well matched to the needs of MO recording. Gd—Fe has too high a Curie temperature and has an in-plane anisotropy. Tp is too low for binary alloys such as Tb—Fe and Dy—Fe. Co-based alloys which exhibit a close to room temperature have... 

Fusion Reactors. The development of fusion reactors requires a material exhibiting high temperature mechanical strength, resistance to radiation-induced swelling and embrittlement, and compatibUity with hydrogen, lithium and various coolants. One aUoy system that shows promise in this appHcation, as weU as for steam-turbine blades and other appHcations in nonoxidizing atmospheres, is based on the composition (Fe,Co,Ni)2V (30). 

Co-, Mn-, and Fe-based perovskites, NO peaks appearing at similar temperatures as those in NO-TPD experiments (apart from a minor desorption at medium temperature and an intense one at high temperature) were also found and aseribed to the desorptions of physically adsorbed NO, nitrosyl species and nitrate species in the order of their thermal stability. The NO peaks obtained at low (80-110 °C), medium (200-210 °C), and high (310-390 °C) temperatures in the present NO-TPD analyses were thus correlated to physically adsorbed NO, nitrosyl and nitrate species. 

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