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Lan(n+1)+xNin(n+5)+ySi(n+1)(n+2)–z: A Symmetric Mirror Homologous Series in the La-Ni-Si System
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.;Univ Genoa, Dept Chem & Ind Chem, DCCI, I-16146 Genoa, Italy.;Inst SPIN CNR, I-16152 Genoa, Italy..
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.;Dept Biol & Chem Engn, DK-8000 Aarhus C, Denmark.;iNANO, DK-8000 Aarhus C, Denmark..ORCID-id: 0000-0003-0763-1457
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.;Dept Biol & Chem Engn, DK-8000 Aarhus C, Denmark.;iNANO, DK-8000 Aarhus C, Denmark..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.ORCID-id: 0000-0002-8690-9957
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2023 (engelsk)Inngår i: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 62, nr 27, s. 10736-10742Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A homologous series La n(n+1)+x Ni n(n+5)+y Si(n+1)(n+2)-z has beenobserved inthe La-Ni-Si representing a symmetric Ni-rich mirrorto the La(n+1)(n+2)Ni n(n-1)+2Si n(n+1). A series of fourhomologous silicides have been discovered duringsystematic explorations in the central part of the La-Ni-Sisystem at 1000 & DEG;C. All compounds La12.5Ni28.0Si18.3 (n = 3; a = 28.8686(8), c = 4.0737(2) & ANGS;, Z = 3), La22.1Ni39.0Si27.8 (n = 4; a = 20.9340(6), c = 4.1245(2) & ANGS;, Z = 1), La32.9Ni49.8Si39.3 (n = 5; a = 24.946(1), c = 4.1471(5) & ANGS;, Z = 1), and La44.8Ni66.1Si53.4 (n =6; a = 28.995(5), c = 4.158(1) & ANGS;, Z = 1) crystallize in the hexagonal space group P6(3)/m and can be generalizedaccording to La n(n+1)+x Ni n(n+5)+y Si(n+1)(n+2)-z with n = 3-6. Their crystalstructures are based on AlB2-type building blocks, fusedLa-centered Ni6Si6 hexagonal prisms, yieldinglarger oligomeric equilateral domains with the edge size equal to n. The domains extend along the c axisand show checkered ordering of the cationic and anionic parts, whileall their atoms are located on mirror planes. La n(n+1)+x Ni n(n+5)+y Si(n+1)(n+2)-z can beconsidered as a mirror series to the La-rich La(n+1)(n+2)Ni n(n-1)+2Si n(n+1), where an exchange of the formal cationic and anionic sites,i.e., La and Si, occurs. The La-Ni-Si system is thefirst system where two such analogous series have been observed.

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American Chemical Society (ACS), 2023. Vol. 62, nr 27, s. 10736-10742
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URN: urn:nbn:se:uu:diva-512489DOI: 10.1021/acs.inorgchem.3c01194ISI: 001018305200001PubMedID: 37364160OAI: oai:DiVA.org:uu-512489DiVA, id: diva2:1800976
Forskningsfinansiär
Swedish Energy Agency, 48699-1Tilgjengelig fra: 2023-09-28 Laget: 2023-09-28 Sist oppdatert: 2023-09-28bibliografisk kontrollert

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