Nonstoichiometry and structure-disorder of pyrrhotite (Fe1-xS)

Origins of Nonstoichiometry and Vacancy Ordering in Sc12x xS

Whereas nearly all compounds AnBm obey Dalton’s rule of integer stoichiometry (n:m, both integer), there is a class of systems, exemplified by the rocksalt structure Sc12x xS, that exhibits large deviations from stoichiometry via vacancies, even at low temperatures. By combining first-principles total energy calculations with lattice statistical mechanics, we scan an astronomical number of poss...

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

Magnetic diffusion anomaly at the Néel temperature of pyrrhotite, Fe(1-x)S.

Cation diffusion is an important rate-limiting process in the growth of pyrrhotite (Fe1-xS) in passivating films on steels exposed to sulfidic environments, and for proposed synthetic applications of Fe1-xS, for example single-phase magnetic switching devices. Above the Néel temperature TN of 315 °C, where Fe1-xS is paramagnetic and structurally disordered, iron self-diffusivity *DFe predictabl...

MAGNETO-OPTIC KERR EFFECT AND ELECTRONIC STRUCTURE OF Fe1/3TaS2

Fel13TaS2 is a ferromagnetic intercalation compound. Band structure calculations show various deviations from the rigid band model. We suggest that the measured Kerr spectrum is due to four transitions with paramagnetic line shape from states situated near the Fermi level to higher lying Ta-states.

Magnetically induced crystal structure and phase stability in Fe1-cCoc.