Silicon‐Tin‐Ordering in RE3Rh9Si2Sn3 (RE = Y, Sm, Gd – Lu)1. Issue 2 (17th November 2014)

• Record Type: Journal Article
• Authors: Voßwinkel, Daniel; Niehaus, Oliver; Gerke, Birgit; Benndorf, Christopher; Eckert, Hellmut; Pöttgen, Rainer
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 641:Issue 2(2015)
• Page Start: 238
• Page End: 246
• Publication Date: 2014-11-17
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201400458
• Languages: English
• ISSNs: 0044-2313

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The quaternary intermetallic compounds <italic>RE</italic><sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub> (<italic>RE</italic> = Y, Sm, Gd – Lu) were obtained from the elements by arc‐melting and investigated by powder X‐ray diffraction. Needle‐shaped single crystals of Ho<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub> and Lu<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub> were grown in bismuth fluxes and their structures were refined from single‐crystal X‐ray diffractometer data: <italic>P</italic><inline-formula><alternatives><tex-math notation="tex"><![CDATA[$\bar{6}$]]></tex-math><inline-graphic xlink:href="ark:/27927/pgh3xswf4gt" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></alternatives></inline-formula>2<italic>m</italic>, <italic>a</italic> = 968.3(2), <italic>c</italic> = 345.6(1) pm, <italic>wR</italic><sub>2</sub> = 0.0278, 426 <italic>F</italic><sup>2</sup> values, 22 variables for Ho<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>, and <italic>a</italic> = 962.4(2), <italic>c</italic> = 343.1(2) pm, <italic>wR</italic><sub>2</sub> = 0.0260, 501 <italic>F</italic><sup>2</sup> values, 23 variables for Lu<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>. The phases <italic>RE</italic><sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub> adopt a new simple structure type with complete silicon‐tin ordering. The silicon atoms have trigonal prismatic rhodium coordination (239 pm Si–Rh in Ho<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>) and the tin atoms are located in slightly distorted square prisms of rhodium (268–274 pm Sn–Rh in Ho<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>). Magnetic investigations were performed for <italic>RE</italic><sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub> (<italic>RE</italic> = Y, Gd – Yb). Except of Y<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>, all investigated compounds exhibit Curie‐Weiss paramagnetism, but ferromagnetic ordering could only be observed for samples containing Gd – Er as rare earth metal. <sup>119</sup>Sn Mössbauer spectroscopic measurements were carried out on Gd<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>. A single resonance at an isomer shift of 1.52(1) mm<bold>·</bold>s<sup>–1</sup> clearly underlines that tin is not part of the polyanionic network and therefore not of a stannide character. Representative <sup>29</sup>Si solid state NMR spectroscopy investigations were carried out on the diamagnetic yttrium compound Y<sub>3</sub>Rh<sub>9</sub>Si<sub>2</sub>Sn<sub>3</sub>. The spectrum indicates the existence of only one distinct Si site consistant with the refined single crystal data.</p> </abstract>