1,721,023 research outputs found
The Y-Cu-Mg system in the 0-66.7 at % Cu concentration range: the isothermal section at 400°C
No full textSynthesis and characterization of about fifty alloys were performed in order to construct the isothermal
section of the Y–Cu–Mg ternary system at 400 C in the 0–66.7 at.% Cu concentration range. Scanning
electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS) and X-ray powder diffraction
(XRPD) techniques were used to examine microstructures, identify phases and define their compositions
and crystal structures. Phase equilibria in the investigated compositional region are characterized by the
absence of extended ternary solid solutions and by the presence of at least ten ternary phases. Crystal
structures of the previously reported Y2Cu2Mg, Y5Cu5Mg8, Y5Cu5Mg13, Y5Cu5Mg16 and YCuMg4 phases
were confirmed. A ternary phase with homogeneity range around the YCu4Mg stoichiometry was found,
crystallizing in the cF24–MgCu4Sn structure type; at 400 C this phase coexists with a ternary solid
solution based on the binary Laves phase Cu2Mg, which dissolves about 5 at.% Y. The equiatomic YCuMg
phase was also found to exist: from the analysis of X-ray powder patterns it is suggested to crystallize in
the hP9–ZrNiAl structure type (a= 0.74449(4) nm, c= 0.39953(2) nm). Two other stoichiometric ternary
phases were detected, of approximate compositions Y25Cu18Mg57 and Y13Cu9Mg78, whose crystal
structures are still unknown. In the Mg-rich region, a ternary phase forms characterized by a large
homogeneity region
The novel intermetallic phases TbNiMg and Tb4+xNi2Mg3-x (x = 0.2): Synthesis, crystal structure and peculiarities
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Anti-Mackay polyicosahedral clusters in La-Ni-Mg ternary compounds: synthesis and crystal structure of the La43Ni17Mg5 new intermetallic phase
No full textInhomogeneous 2D linear intergrowth structures among novel Y-Cu-Mg ternary compounds with yttrium/copper equiatomic ratio
No full textThe isothermal section of the La-Ag-Mg phase diagram at 400°C
No full textThe whole isothermal section of the La-Ag-Mg phase diagram at 400 °C was constructed by means of phase identification and analysis on about eighty annealed ternary alloys. The tendency of Ag and Mg to reciprocally substitute in binary Ag-Mg phases reflects in the formation of several La-Ag-Mg ternary phases including solid solutions based on boundary binary phases, which show wide homogeneity regions extending at a constant La-content.
Among the solid solutions, La(AgxMg1-x) (0 <1, cP2-CsCl), La(AgxMg1-x)3 (0<0.67, cF16-BiF(3)) and La2(AgxMg1-x)17 (
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Interaction of the components in the Ce-Cu-Zn ternary system at 200 °c
No full textThe isothermal section of the Ce-Cu-Zn phase diagram was constructed at 200 °C over the whole concentration range as a result of X-ray powder diffraction, wavelength dispersive spectrometry and electron probe microanalysis. The existence of one new ternary compound Ce2Cu 5-5.7Zn2-1.3 was observed at this temperature and its crystal structure was refined from X-ray single crystal data (structure type Ce2Ni5Zn2, space group R3̄m, Pearson code hR18, a = 0.4998(1)-0.5078(1) nm, c = 3.6924(5)-3.6987(4) nm). The homogeneity regions were determined for a number of solid solutions on the basis of binary phases. © 2005 Elsevier B.V. All rights reserved
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