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Conversion electron mössbauer spectroscopy
About: Conversion electron mössbauer spectroscopy is a research topic. Over the lifetime, 941 publications have been published within this topic receiving 9833 citations.
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TL;DR: In this article, it was shown that fcc Fe(100) stabilized at a lattice constant close to that of Cu has an antiferromagnetic ground state, and showed that it is magnetically ordered and shows a small average hyperfine field, e.g., 1.1 T at 29 K for 10 monolayers.
Abstract: Ultrathin films (10 to 17 monolayers) of fcc Fe(100) grown epitaxially on Cu(100) are unambiguously found to be paramagnetic at 295 K by $^{57}\mathrm{Fe}$ conversion-electron M\"ossbauer spectroscopy in UHV. Below ${T}_{\mathrm{N}}=65\ifmmode\pm\else\textpm\fi{}5$ K, fcc-Fe films are magnetically ordered and show a small average hyperfine field, e.g., 1.1 T at 29 K for 10 monolayers, indicating a small atomic magnetic moment. This demonstrates that fcc Fe(100) stabilized at a lattice constant close to that of Cu has an antiferromagnetic ground state.
174 citations
TL;DR: In this paper, a collection of 16 metals with the face-centered-cubic (fcc) crystal structure, including stainless steels, Fe-Ni alloys and pure Ni, have been subjected to the same nitrogen ion beam processing conditions to examine the role of alloy composition in the surface modification behavior.
Abstract: A collection of 16 metals with the face-centered-cubic (fcc) crystal structure, including stainless steels, Fe–Ni alloys and pure Ni, have been subjected to the same nitrogen ion beam processing conditions to examine the role of alloy composition in the surface modification behavior. A low-energy (700 eV), high-flux (2 mA cm −2 ) beam of ions was used with each sample held at 400 °C during a 15 min treatment. The near surface regions have been characterized by conventional and grazing-incidence X-ray diffraction, Auger electron spectroscopy, conversion electron Mossbauer spectroscopy, and microhardness measurements. There is a clear distinction in the modifications depending on whether the alloys are Fe-rich or Ni-rich. Fe-rich samples all yield relatively thick (2.5–3.5 μm) layers with high N content in solid solution. The large lattice expansions lead to ferromagnetism in these surfaces. A novel double-layer structure has been induced in all the Fe-rich alloys, corresponding to two rather well-defined N contents: high (20–26 at%) in the surface layer, and medium (4–10 at%) in the subsurface layer. It is suggested that this substructure is caused by stress-assisted diffusion. The Ni-rich alloys have much thinner N-containing layers (≤1 μm) and a much lower amount of N retained in the (111) planes oriented parallel to the surface compared to those in the Fe-rich alloys.
153 citations
TL;DR: In this article, cubic cubic FeN phase has been produced via RF magnetron sputtering and their properties have been investigated as a function of the deposition parameters (substrate temperature, N 2 and Ar flows, bias voltage and RF power) to optimize their purity and structure.
116 citations
TL;DR: In this paper, a model is suggested to explain that the relatively low electron mobility of Zn2SnO4 may be associated with disorder on the cation octahedral sites, which may disrupt transport between edge sharing d10s0 electronically configured cations.
Abstract: Polycrystalline thin films of Zn2SnO4 were deposited by rf magnetron sputtering onto glass substrates. Films were characterized by θ–2θ x-ray diffraction and by 119Sn conversion electron Mossbauer spectroscopy. The films were randomly oriented in a cubic spinel structure. Comparison of x-ray diffraction peak intensities with structure-factor-calculated peak intensities confirmed that the films were in an inverse spinel configuration. Mossbauer studies detected two distinct Sn4+ octahedral sites. These distinct sites may be induced by distortions in the lattice associated with equally distinct Zn2+ octahedral sites. A model is suggested to explain that the relatively low electron mobility of Zn2SnO4 may be associated with disorder on the cation octahedral sites. This may disrupt transport between edge-sharing d10s0 electronically configured cations.
100 citations
TL;DR: In this article, it was shown that AISI 304 and 310 stainless steels have extremely strong and wear-resistant surfaces due to high-dose nitrogen ion implantation at elevated temperatures.
82 citations