Searching for pure iron in nature: the Chelyabinsk meteorite / Leedahl Brett,Korolev Aleksander V.,Zhidkov Ivan S.,Skornyakov Sergey L.,Anisimov Vladimir I.,Belozerov Alexander S.,Kukharenko Andrey I.,Kurmaev Ernst Z.,Grokhovskii Victor I.,Cholakh Seif O.,Moewes Alexander // RSC ADVANCES. - 2016. - V. 6, l. 89. - P. 85844-85851.

ISSN/EISSN:

2046-2069 / нет данных

Type:

Article

Abstract:

Herein we aimed to use thermomagnetic analysis (TMA) to determine the nature of iron and nickel in the Chelyabinsk meteorite, and their effect on the meteorite's magnetism. Our magnetic measurements show that 3\% of the meteorite is metallic and consists of two ferromagnetic phases with Curie temperatures of T-C1 = 1049 K and T-C2 = 800 K. Using an Fe-Ni phase diagram, we show that the lower of the two temperatures is due to an Fe-Ni alloy with 51\% Ni, while the higher Curie temperature phase is due to a pure or nearly pure (Ni-free) iron phase, for which we can be certain the Ni content is less than 1\%. X-ray absorption (XAS) measurements show there are two clearly distinct iron oxidation environments: metallic and 2+, with the 2+ regions differing significantly from the standard FeO phase. We also demonstrate that beneath the immediate surface, iron exists virtually entirely in a metallic state. We are then able to estimate the surface composition using XPS, for which we found that 10\% of iron on the surface is still surprisingly unoxidized. Finally, our theoretical calculations show how the density of states for both Fe and Ni atoms is affected for different nickel concentrations.

Author keywords:

NATIVE IRON; PHOTOELECTRON-SPECTROSCOPY; MOSSBAUER-SPECTROSCOPY; ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; FE; CHONDRITES; XPS; GPA

DOI:

10.1039/c6ra16598b

Web of Science ID:

ISI:000384322700021

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
Keywords-Plus	NATIVE IRON; PHOTOELECTRON-SPECTROSCOPY; MOSSBAUER-SPECTROSCOPY; ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; FE; CHONDRITES; XPS; GPA
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Author-Email	brett.leedahl@usask.ca
ResearcherID-Numbers	Belozerov, Alexander/J-8098-2013 Kurmaev, Ernst/J-4254-2013 Zhidkov, Ivan/L-3543-2013 Skornyakov, Sergey/K-8132-2013 Alexander, Korolev/K-3036-2013
ORCID-Numbers	Belozerov, Alexander/0000-0001-9506-8718 Kurmaev, Ernst/0000-0003-4625-4930 Zhidkov, Ivan/0000-0001-8727-4730 Skornyakov, Sergey/0000-0001-8024-0917 Alexander, Korolev/0000-0002-5104-3997 Cholakh, Seif/0000-0002-9313-6614
Funding-Acknowledgement	Russian Science Foundation {[}14-22-00004]; Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Research Chair program
Funding-Text	The CPA-DMFT calculations, XPS and magnetic measurements were supported by Russian Science Foundation (Project 14-22-00004). The XAS measurements were performed at the Canadian Light Source, and XES measurements were performed at the Advanced Light Source, both were supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canada Research Chair program.
Number-of-Cited-References	45
Usage-Count-Last-180-days	5
Usage-Count-Since-2013	9
Journal-ISO	RSC Adv.
Doc-Delivery-Number	DX4BG