Phase relationships and structural, magnetic, and thermodynamic properties of alloys in the pseudobinary Er5Si4-Er5Ge4 system Lograsso, Thomas Pecharsky, A. Gschneidner, Karl Schlagel, Deborah Pecharsky, Vitalij Schlagel, Deborah Lograsso, Thomas
dc.contributor.department Ames Laboratory 2018-02-13T14:34:55.000 2020-06-29T23:28:02Z 2020-06-29T23:28:02Z Thu Jan 01 00:00:00 UTC 2004 2013-09-23 2004-10-29
dc.description.abstract <p>The room temperature crystal structures of Er<sub>5</sub>Si<sub>x</sub>Ge<sub>4−x</sub> alloys change systematically with the concentration of Ge from the orthorhombic Gd<sub>5</sub>Si<sub>4</sub>-type when x=4, to the monoclinic Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>2</sub> type when 3.5⩽x⩽3.9 and to the orthorhombic Sm<sub>5</sub>Ge<sub>4</sub> type forx⩽3. The Curie-Weiss behavior of Er<sub>5</sub>Si<sub>x</sub>Ge<sub>4−x</sub> materials is consistent with the Er3+ state. The compounds order magnetically below 30 K, apparently adopting complex noncollinear magnetic structures with magnetization not reaching saturation in 50 kOe magnetic fields. In Er<sub>5</sub>Si<sub>4</sub>, the structural-only transformation from the monoclinic Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>2</sub>-type to the orthorhombic Gd<sub>5</sub>Si<sub>4</sub>-type phase occurs around 218 K on heating. Intriguingly, the temperature of this polymorphic transformation is weakly dependent on magnetic fields as low as 40 kOe (dT∕dH=−0.058 K∕kOe) when the material is in the paramagnetic state nearly 200 K above its spontaneous magnetic ordering temperature. It appears that a magnetostructural transition may be induced in the 5:4 erbium silicide at ∼18 K and above by 75 kOe and higher magnetic fields. Only Er<sub>5</sub>Si<sub>4</sub> but none of the other studied Er<sub>5</sub>Si<sub>x</sub>Ge<sub>4−x</sub> alloys exhibit magnetic field induced transformations, which are quite common in the closely related Gd<sub>5</sub>Si<sub>x</sub>Ge<sub>4−x</sub> system. The magnetocaloric effects of the Er<sub>5</sub>Si<sub>x</sub>Ge<sub>4−x</sub> alloys are moderate.</p>
dc.description.comments <p>This article is from <em>Physical Review B</em> 70 (2004): 144419, doi:<a href="" target="_blank">10.1103/PhysRevB.70.144419</a>.</p>
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dc.identifier archive/
dc.identifier.articleid 1098
dc.identifier.contextkey 4614659
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_pubs/91
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 02:28:01 UTC 2022
dc.source.uri 10.1103/PhysRevB.70.144419
dc.subject.disciplines Condensed Matter Physics
dc.subject.disciplines Metallurgy
dc.subject.keywords Materials Science and Engineering
dc.title Phase relationships and structural, magnetic, and thermodynamic properties of alloys in the pseudobinary Er5Si4-Er5Ge4 system
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isAuthorOfPublication 220ce8a4-546b-4118-8d44-911799a0ffa1
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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