Isothermal section at 800°C of the ternary system Tm-Fe-Si
Identifieur interne : 002D00 ( Main/Merge ); précédent : 002C99; suivant : 002D01Isothermal section at 800°C of the ternary system Tm-Fe-Si
Auteurs : M. Muller [Allemagne] ; H. Schmidt [Allemagne] ; H. F. Braun [Allemagne]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 1997.
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- Pascal (Inist)
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- topic : Fer.
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Abstract
Copyright (c) 1997 Elsevier Science S.A. All rights reserved. The isothermal section at 800°C of the Tm-Fe-Si ternary phase diagram was investigated using X-ray diffractometry, metallographic analysis and EDX-microanalysis. We found eleven binary and at least nine ternary phases. For two ternary phases reported as Tm2Fe4Si9 with Y2Fe4Si9-type structure [1] and Tm3Fe2Si7 with Ho3Co2Si7-type structure [1] the composition could not be confirmed, but was found as Tm9±1Fe26±1Si65±3 and Tm21±1Fe18.5±1Si60.5±1. New ternary phases were found at compositions Tm30±1Fe12.8±1Si57.2±1, which could be indexed orthorhombic, Tm30±2Fe5±1Si65±3, Tm37±1Fe25±1Si38±1 and Tm40±1Fe19±1Si41±1. Two binary and four ternary phases are in equilibrium with the re-entrant superconducting compound Tm2Fe3Si5, which are FeSi, TmSi, TmFe2Si2, Tm21±1Fe18.5±1Si60.5±1, Tm9±1Fe26±1Si65±1 and Tm30±1Fe12.8±1Si57.2±1. The width of the homogeneity range of the Tm2Fe3Si5 phase was determined to 1.6±0.4 at.% at constant Tm concentration and to 0.5±0.15 at.% at constant Fe/Si-ratio.
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<term>Experimental study</term>
<term>Intermetallic compounds</term>
<term>Iron</term>
<term>Isothermal section</term>
<term>Metallography</term>
<term>Phase diagrams</term>
<term>Phase equilibria</term>
<term>Silicon</term>
<term>Space groups</term>
<term>Ternary alloys</term>
<term>Thulium</term>
<term>XRD</term>
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<term>Diagramme phase</term>
<term>Section isotherme</term>
<term>Thulium</term>
<term>Fer</term>
<term>Silicium</term>
<term>XRD</term>
<term>Métallographie</term>
<term>Structure cristalline</term>
<term>Composé intermétallique</term>
<term>Etude expérimentale</term>
<term>Alliage ternaire</term>
<term>Groupe espace</term>
<term>Système Fe Si Tm</term>
<term>8130B</term>
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<front><div type="abstract" xml:lang="en">Copyright (c) 1997 Elsevier Science S.A. All rights reserved. The isothermal section at 800°C of the Tm-Fe-Si ternary phase diagram was investigated using X-ray diffractometry, metallographic analysis and EDX-microanalysis. We found eleven binary and at least nine ternary phases. For two ternary phases reported as Tm<sub>2</sub>
Fe<sub>4</sub>
Si<sub>9</sub>
with Y<sub>2</sub>
Fe<sub>4</sub>
Si<sub>9</sub>
-type structure [1] and Tm<sub>3</sub>
Fe<sub>2</sub>
Si<sub>7</sub>
with Ho<sub>3</sub>
Co<sub>2</sub>
Si<sub>7</sub>
-type structure [1] the composition could not be confirmed, but was found as Tm<sub>9±1</sub>
Fe<sub>26±1</sub>
Si<sub>65±3</sub>
and Tm<sub>21±1</sub>
Fe<sub>18.5±1</sub>
Si<sub>60.5±1</sub>
. New ternary phases were found at compositions Tm<sub>30±1</sub>
Fe<sub>12.8±1</sub>
Si<sub>57.2±1</sub>
, which could be indexed orthorhombic, Tm<sub>30±2</sub>
Fe<sub>5±1</sub>
Si<sub>65±3</sub>
, Tm<sub>37±1</sub>
Fe<sub>25±1</sub>
Si<sub>38±1</sub>
and Tm<sub>40±1</sub>
Fe<sub>19±1</sub>
Si<sub>41±1</sub>
. Two binary and four ternary phases are in equilibrium with the re-entrant superconducting compound Tm<sub>2</sub>
Fe<sub>3</sub>
Si<sub>5</sub>
, which are FeSi, TmSi, TmFe<sub>2</sub>
Si<sub>2</sub>
, Tm<sub>21±1</sub>
Fe<sub>18.5±1</sub>
Si<sub>60.5±1</sub>
, Tm<sub>9±1</sub>
Fe<sub>26±1</sub>
Si<sub>65±1</sub>
and Tm<sub>30±1</sub>
Fe<sub>12.8±1</sub>
Si<sub>57.2±1</sub>
. The width of the homogeneity range of the Tm<sub>2</sub>
Fe<sub>3</sub>
Si<sub>5</sub>
phase was determined to 1.6±0.4 at.% at constant Tm concentration and to 0.5±0.15 at.% at constant Fe/Si-ratio.</div>
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