An experimental study of the Fe–Sn–Zr ternary system at 900 °C

Savidan, J.-C.; Joubert, Jean-Marc; Toffolon-Masclet, Caroline

doi:10.1016/j.intermet.2010.07.007

Cited by 14 publications

(27 citation statements)

References 9 publications

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“…[24][25][26] Hf and Zr have nearly identical chemistry in most situations, and as expected Hf 3 Fe 4 Sn 4 adopts the same orthorhombic structure as the Zr 3 Fe 4 Sn 4 analogue, which has been explicitly identified by metallography and powder X-ray diffraction. 24,26 The structure is an ordered variant of the Hf 3 Cu 8 structure type 27 in which the Fe and Sn adopt the Cu sites in a perfectly ordered fashion. This structure type can also accommodate other ordered ternary compositions with transition metals and main group elements occupying the Cu sites, the best example of which is Sc 3 Mn 2 Ga 6 .…”

Section: Introductionmentioning

confidence: 72%

“…9,23 While little is known about the Hf -Fe -Sn phase diagram, the Zr -Fe -Sn phase diagram has been more extensively explored because it is relevant to the design of nuclear reactor shielding and engineering controls. [24][25][26] Hf and Zr have nearly identical chemistry in most situations, and as expected Hf 3 Fe 4 Sn 4 adopts the same orthorhombic structure as the Zr 3 Fe 4 Sn 4 analogue, which has been explicitly identified by metallography and powder X-ray diffraction. 24,26 The structure is an ordered variant of the Hf 3 Cu 8 structure type 27 in which the Fe and Sn adopt the Cu sites in a perfectly ordered fashion.…”

Section: Introductionmentioning

confidence: 73%

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Hf3Fe4Sn4 and Hf9Fe4−Sn10+: Two stannide intermetallics with low-dimensional iron sublattices

Calta

Kanatzidis

2016

Journal of Solid State Chemistry

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This Article reports two new Hf-rich intermetallics synthesized using Sn flux: Hf 3 Fe 4 Sn 4 and Hf 9 Fe 4-x Sn 10+x. Hf 3 Fe 4 Sn 4 adopts an ordered variant the Hf 3 Cu 8 structure type in orthorhombic space group Pnma with unit cell edges of a = 8.1143(5) Å, b = 8.8466(5) Å, and c = 10.6069(6) Å. Hf 9 Fe 4x Sn 10+x , on the other hand, adopts a new structure type in Cmc2 1 with unit cell edges of a = 5.6458(3) Å, b = 35.796(2) Å, and c = 8.88725(9) Å for x = 0. It exhibits a small amount of phase width in which Sn substitutes on one of the Fe sites. Both structures are fully three-dimensional and are characterized by pseudo one-and two-dimensional networks of Fe-Fe homoatomic bonding. Hf 9 Fe 4-x Sn 10+x exhibits antiferromagnetic order at T N = 46(2) K and its electrical transport behavior indicates that it is a normal metal with phonon-dictated resistivity. Hf 3 Fe 4 Sn 4 is also an antiferromagnet with a rather high ordering temperature of T N = 373(5) K. Single crystal resistivity measurements indicate that Hf 3 Fe 4 Sn 4 behaves as a Fermi liquid at low temperatures, indicating strong electron correlation.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 73%

Hf3Fe4Sn4 and Hf9Fe4−Sn10+: Two stannide intermetallics with low-dimensional iron sublattices

Calta

Kanatzidis

2016

Journal of Solid State Chemistry

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“…25 solid solution with a cell edge of 2.98 Å found previously in a rapidly quenched sample. 31 The new tetragonal unit cell is also significantly larger than the cubic body centered cell of a Fe .75 Sn . 25 solid solution with a cell edge of 2.98 Å found previously in a rapidly quenched sample.…”

Section: Resultsmentioning

confidence: 94%

Stannate Increases Hydrogen Evolution Overpotential on Rechargeable Alkaline Iron Electrodes

Chamoun

Skårman

Vidarsson

et al. 2017

J. Electrochem. Soc.

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Alkaline iron electrodes present some challenges for use in secondary batteries that are associated with low coulombic efficiency and discharge utilization. Low coulombic efficiency is correlated to the hydrogen evolution reaction that takes place during charge. In this work, we demonstrate rechargeable alkaline iron electrodes with significant capacity retention over 150 cycles with high efficiency by suppressing the hydrogen evolution with stannate. Adding stannate to the alkaline electrolyte when cycling the iron electrode drastically changes the electrochemistry. The additive brings on two advantageous attributes for the iron electrode: increased hydrogen evolution overpotential, and a flat and prolonged discharge curve at typical battery operation. These attributes were provided by a novel intermediate phase that was detected from in situ neutron diffraction measurements. This phase was only detected in situ while it decomposed ex situ, and indicated a solid solution constituted by some of the elements present in the electrode.

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“…En este diagrama se incluyen los compuestos encontrados a esta temperatura en este trabajo: Fe 5 Sn 3 / Fe 6 Sn 6 Zr / Y / ZrFe 2 (C15) / (C36) / N. Se verificó e incluyó además la presencia de la fase X" [4]. Se determinaron campos de existencia de 1, 2 y 3 fases.…”

Section: Conclusionesunclassified

“…Entre los últimos trabajos publicados al respecto pueden mencionarse: una revisión del año 2009 realizada por Liu y col. [1], basada entre otros en los trabajos de Nieva y Arias [2,3]; el trabajo de Savidan y col. [4] que estudiaron una gran extensión del diagrama de fases de este sistema a la temperatura de 900°C (basados esencialmente en el trabajo de Nieva y Arias [3]). Otra recopilación realizada por Raghavan en 2011 [5] está basada entre otros en los trabajos de Nieva y Arias [2,3,6] y de Savidan y col. [4]. En 2012 Nieva y col. presentaron una nueva propuesta para el corte isotérmico a 800°C del sistema ternario [7].…”

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Diagrama de fases experimental Fe-Sn-Zr. Nuevos resultados del corte isotérmico de 800 °C

et al. 2018

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RESUMENLas aleaciones de base Zr son de extendida aplicación en el campo de la tecnología nuclear. El Zr aleado con Sn y Fe es la base principal de las aleaciones tipo Zircaloy, aún hoy muy utilizadas como elementos estructurales y como contenedores de los elementos combustibles en reactores nucleares de potencia. Este sistema metalúrgico ternario también forma parte de aleaciones de más reciente desarrollo como las Zirlo (EEUU). Si bien en todas ellas el Zr es el aleante mayoritario es útil e importante conocer los diagramas de fases de sus componentes en la forma más completa posible.El diagrama de fases Fe-Sn-Zr viene siendo estudiado en forma sistemática por el grupo de trabajo desde hace años. Se ha avanzado mucho en el trazado del diagrama de fases a 800ºC, pero han quedado regiones del triángulo de Gibbs sin resolver. Con el objeto de evaluar experimentalmente estas zonas se procedió al diseño y fabricación de un conjunto de aleaciones ternarias. Las mismas fueron tratadas térmicamente a la temperatura de interés por 2928 horas y caracterizadas aplicando técnicas de metalografía, difracción de rayos X y de microanálisis. En este trabajo se confirmó la existencia de los compuestos ternarios Y y Fe 6 Sn 6 Zr, así como la presencia de la fase X" y se determinaron campos de existencia de 2 y 3 fases, todo a 800°C. Finalmente se trazaron los límites de equilibrio de fases en las regiones bajo estudio, completando en gran proporción el diagrama de fases para el corte isotérmico analizado. Palabras clave: Materiales nucleares, Diagramas de Fases, Circonio. ABSTRACTThe Zr-based alloys are extensively applied in the field of nuclear technology. Alloyed with Sn and Fe, Zr is the main element in the zircaloy-type alloys, currently vastly used as structural elements and as containers of burnable elements in nuclear reactors. This ternary metallurgical system is also a component of more recently developed alloys such as Zirlo (USA). Although Zr is a major component in all of them, it is most important to know the phase diagrams of their components as best as possible. The Fe-Sn-Zr phase diagram has been systematically studied by our research team for many years. Considerable advancement has been made in the design of the phase diagram at 800°C, however, some regions in the Gibbs triangle are still unsolved. In order to evaluate these regions experimentally, a ternary alloy set was designed and prepared. These alloys were thermally treated at the chosen temperature for 2928 hours, and characterized by applying metallography techniques, X-ray diffraction and microanalysis. The presence of Y and Fe 6 Sn 6 Zr was confirmed, the presence of phase X" was verified, and 2-and 3-phase existence fields were determined. Finally, phase balance boundaries in the regions under study were traced, completing, to a great extent, the phase diagram for the isothermal cut analysed.

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An experimental study of the Fe–Sn–Zr ternary system at 900 °C

Cited by 14 publications

References 9 publications

Hf3Fe4Sn4 and Hf9Fe4−Sn10+: Two stannide intermetallics with low-dimensional iron sublattices

Hf3Fe4Sn4 and Hf9Fe4−Sn10+: Two stannide intermetallics with low-dimensional iron sublattices

Stannate Increases Hydrogen Evolution Overpotential on Rechargeable Alkaline Iron Electrodes

Diagrama de fases experimental Fe-Sn-Zr. Nuevos resultados del corte isotérmico de 800 °C

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