Structural Chemistry and Magnetic Properties of RE
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Structural Chemistry and Magnetic Properties of RE 2 [Sn x Ge 1-x ] 5 (RE = Nd, Sm) and RE[Sn x Ge 1-x ] 2 (RE = Gd, Tb): Four New Rare-Earth Metal Intermetallic Compounds with Germanium Zig-Zag Chains and Tin Square-Nets Svilen Bobev, University of Delaware, DMR 0743916.

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Education and Mentoring Undergraduate Participation: -Matt Broda (Summer, 2008)

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Education and mentoring undergraduate participation matt broda summer 2008

Structural Chemistry and Magnetic Properties of RE2[SnxGe1-x]5 (RE = Nd, Sm) and RE[SnxGe1-x]2 (RE = Gd, Tb): Four New Rare-Earth Metal Intermetallic Compounds with Germanium Zig-Zag Chains and Tin Square-NetsSvilen Bobev, University of Delaware, DMR 0743916

The structures of I and II are closely “rooted” from one ubiquitous structure type, CrB, which exemplifies the [Ge2] zig-zag chains seen here and in other REGe monogermanides. As we schematically illustrate in the figure to the right, many more structures, including those of another common type, ZrSi2, can be “designed” by a simple “cut-and-paste” approach, where orthogonal chains or square sheets are inserted between the depicted zig-zag fragments. Starting with a CrB-like REGe monogermanide for example, and following this formalism, the simplest structure to build is that of REGe2, where every other [Ge2] chain is replaced by a square sheet, [Ge], leading to doubling of the stacking sequence and an arrangement of the ZrSi2-type. If every other [Ge2] chain is replaced by not one, but two square sheets that come in contact, i.e. double-square nets [Ge2], this will lead to an arrangement analogous to that in the DyGe3-type. Further “fine-tuning” of the latter structures by replacing every other [Ge]-single or [Ge2]-double square sheet with different [Ge2] chains, will lead again to doubling of the stacking sequence and structural arrangements analogous to those in I and II, respectively.

Tobash, P.H.; Bobev, S.; J. Alloys Compds.2008, submitted 05/16/08


Education and mentoring undergraduate participation matt broda summer 2008

Structural Chemistry and Magnetic Properties of RE2[SnxGe1-x]5 (RE = Nd, Sm) and RE[SnxGe1-x]2 (RE = Gd, Tb): Four New Rare-Earth Metal Intermetallic Compounds with Germanium Zig-Zag Chains and Tin Square-NetsSvilen Bobev, University of Delaware, DMR 0743916

HIGHLIGHTS from 15-Ferbruary-2008 – 1-August-2008

Dissemination of the results

A talk and a poster have been presented at the 25th Rare-earth research conference, held at the University of Alabama (June 22-26, 2008).

Two papers have been submitted for publication.

Undergraduate students will present their results at the upcoming campus-wide Undergraduate research symposium - August 13, 2008.

Education and Mentoring

Undergraduate Participation:

-Matt Broda (Summer, 2008)

-Benn Hmiel (Summer, 2008)

Graduate Participation:

Paul H. Tobash

Graduate Recruiting:

-William Green (Summer, 2008)

-AJ Anthonelli (Summer, 2008)


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