Bell, Thomas, Smetana, Volodymyr ORCID: 0000-0003-0763-1457, Mudring, Anja-Verena and Meyer, Gerd H. (2020). Binary Intermetallics in the 70 atom % R Region of Two R-Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent? Inorg. Chem., 59 (15). S. 10802 - 10813. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-510X

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Abstract

Although rare-earth-metal-transition-metal (R/T) phase diagrams have been explored extensively, our recent studies have uncovered new previously nonexistent binary intermetallics. These compounds belong to a narrow region between 70 and 71.4 atom % of the rare-earth metal but represent four different structure types. The binaries Tb7Pd3 and Er17Pd7 are compositionally approaching (less than 1 atom % difference) the previously reported R2.16Pd0.89 (R = Tb and Er), and apparently form by peritectoid transformation, thus, being hard to detect by fast cooling. Tb7Pd3 (1) crystallizes in the Th7Fe3 structure type (hP20, P6(3)mc, a = 9.8846(4) angstrom, c = 6.2316(3) angstrom, Z = 2) while Er17Pd7 (2) belongs to the Pr17Co7 type being its second reported representative (cP96, P2(1)3, a = 13.365(2) degrees, Z = 4). Er17Pd7 (2) is overlapping with the cubic F-centered Er2.11Pd0.89 (3b, Fd (3) over barm, a = 13.361(1) angstrom, Z = 32) with practically identical unit cell parameters but a significantly different structure. Electronic structure calculations confirm that heteroatomic R-T bonding strongly dominates in all structures; T-T bonding interactions are individually strong but do not play a significant role in the total bonding.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Bell, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smetana, VolodymyrUNSPECIFIEDorcid.org/0000-0003-0763-1457UNSPECIFIED
Mudring, Anja-VerenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meyer, Gerd H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-324009
DOI: 10.1021/acs.inorgchem.0c01311
Journal or Publication Title: Inorg. Chem.
Volume: 59
Number: 15
Page Range: S. 10802 - 10813
Date: 2020
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1520-510X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EARTH-COBALT COMPOUNDS; RARE-EARTH; CRYSTAL-STRUCTURE; PHASE-DIAGRAM; INTERMEDIATE PHASES; PALLADIUM; GOLD; TM; LU; HOMultiple languages
Chemistry, Inorganic & NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/32400

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