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Single crystals of Tb<jats:sub>3<\/jats:sub>Pd<jats:sub>2<\/jats:sub> and Er<jats:sub>6<\/jats:sub>Co<jats:sub>5\u2013<jats:italic>x<\/jats:italic>\n                  <\/jats:sub> suitable for X-ray structure analysis were obtained using rare-earth halides as a flux. Tb<jats:sub>3<\/jats:sub>Pd<jats:sub>2<\/jats:sub> adopts its own structure type, which can be described as a superstructural derivative of the U<jats:sub>3<\/jats:sub>Si<jats:sub>2<\/jats:sub> type, which is the type adopted by Er<jats:sub>3<\/jats:sub>Pd<jats:sub>2<\/jats:sub>. Compound Er<jats:sub>6<\/jats:sub>Co<jats:sub>5\u2013<jats:italic>x<\/jats:italic>\n                  <\/jats:sub> belongs to the Ce<jats:sub>6<\/jats:sub>Co<jats:sub>2\u2013<jats:italic>x<\/jats:italic>\n                  <\/jats:sub>Si<jats:sub>3<\/jats:sub> family. All three compounds feature fused tricapped {<jats:italic>TR<\/jats:italic>\n                  <jats:sub>6<\/jats:sub>} (<jats:italic>R<\/jats:italic> = rare-earth metal and <jats:italic>T<\/jats:italic> = transition metal) trigonal prismatic heterometallic clusters. <jats:italic>R<\/jats:italic>\n                  <jats:sub>3<\/jats:sub>Pd<jats:sub>2<\/jats:sub> is reported to crystallize in the U<jats:sub>3<\/jats:sub>Si<jats:sub>2<\/jats:sub> type; however, our more detailed structure analysis reveals that deviations occur with heavier <jats:italic>R<\/jats:italic> elements. Similarly, Er<jats:sub>6<\/jats:sub>Co<jats:sub>5\u2013<jats:italic>x<\/jats:italic>\n                  <\/jats:sub> was assumed to be stoichiometric Er<jats:sub>4<\/jats:sub>Co<jats:sub>3<\/jats:sub> = Er<jats:sub>6<\/jats:sub>Co<jats:sub>4.5<\/jats:sub>. Our studies reveal that it has a single defective transition-metal site leading to the composition Er<jats:sub>6<\/jats:sub>Co<jats:sub>4.72(2)<\/jats:sub>. LMTO (linear muffin-tin orbital)-based electronic structure calculations suggest the strong domination of heteroatomic bonding in all three structures.<\/jats:p>","DOI":"10.1107\/s2053229618010549","type":"journal-article","created":{"date-parts":[[2018,8,6]],"date-time":"2018-08-06T14:55:54Z","timestamp":1533567354000},"page":"991-996","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":4,"title":["Tb<sub>3<\/sub>Pd<sub>2<\/sub>, Er<sub>3<\/sub>Pd<sub>2<\/sub> and Er<sub>6<\/sub>Co<sub>5\u2013<i>x<\/i>\n                  <\/sub>: structural variations and bonding in rare-earth-richer binary intermetallics"],"prefix":"10.1107","volume":"74","author":[{"given":"Thomas","family":"Bell","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7173-6299","authenticated-orcid":true,"given":"Chris R.","family":"Celania","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volodymyr","family":"Smetana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anja-Verena","family":"Mudring","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerd","family":"Meyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2018,8,6]]},"reference":[{"key":"jx3018_bb1","doi-asserted-by":"crossref","first-page":"2697","DOI":"10.1107\/S0567740876008595","volume":"32","author":"Adams","year":"1976","journal-title":"Acta Cryst. 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