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Ternary metal borides [La,Ce,Pr,Nd,Sm] Os4B4 and [Y,La,Ce,Pr,Nd,Sm,Gd,Tb] Ir4B4 with NdCo4B4-type structure

Ternäre Metallboride. [La,Ce,Pr,Nd,Sm] Os4B4 und [Y,La,Ce,Pr,Nd,Sm,Gd,Tb] Ir4B4 mit NdCo4B4-Struktur

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Abstract

New ternary metal borides with compositionR. E. T 4B4 (R. E.=rare earth metal,T=transition metal) have been synthesized within the systems [La,Ce,Pr,Nd,Sm]−Os−B and [Y, La, Ce, Pr, Nd, Sm, Gd, Tb]−Ir−B. All compounds were found to be crystallizing with NdCo4B4-type structure. Magnetic measurements (80–300 K,Curie-Weiss behaviour, θ p ~ 16K and µeff=9.94µB for TbIr4B4) indicate Y andR. E. elements (except Ce) to be trivalent in these compounds. The crystal chemistry of the isotypic series [Y,R. E.] [Os,Ir]4B4 is discussed.

Zusammenfassung

Es wurden neue Metallboride der ZusammensetzungR. E. T 4B4 (R. E.=Seltenerdmetall,T=Übergangsmetall) innerhalb der Systeme [La,Ce, Pr,Nd,Sm]−Os−B und [Y,La,Ce,Pr,Nd,Sm,Gd,Tb]−Ir−B hergestellt. Alle Verbindungen kristallisieren entsprechend dem NdCo4B4-Typ. Magnetische Messungen (80–300K,Curie-Weiss-Verhalten, θ p ~ 16K und µeff=9.94µB für TbIr4B4) zeigen an daß Y und dieR. E.-Elemente (ausgenommen Ce) in diesen Verbindungen trivalent sind. Die Kristallchemie der isotypen [Y,R. E.][Os,Ir]4B4-Verbindungen wird diskutiert.

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Rogl, P. Ternary metal borides [La,Ce,Pr,Nd,Sm] Os4B4 and [Y,La,Ce,Pr,Nd,Sm,Gd,Tb] Ir4B4 with NdCo4B4-type structure. Monatshefte für Chemie 110, 235–243 (1979). https://doi.org/10.1007/BF00903766

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Keywords

  • Borides
  • Magnetic measurements
  • Rare earth systems
  • Structural chemistry
  • Ternary metal borides