Crystal structure and magnetic properties of americium laves phases

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An investigation was made of a series of binary americium alloys with AB$sub 2$ stoichiometry (B = Al, Co, Fe, Rh and Ru) prepared from the $sup 243$Am isotope. The C-15 (MgCu$sub 2$-type) structure appears in AmAl$sub 2$, AmCo$sub 2$, AmFe$sub 2$, and AmRh$sub 2$, whereas AmRu$sub 2$ is isostructural with AmOs$sub 2$ which has the C-14 (MgZn$sub 2$-type) structure. The magnetic properties of the cubic americium laves phases were studied by means of magnetization and nuclear gamna-ray resonance (Moessbauer effect) measurements between 2.5 and 300$sup 0$K. All the cubic Laves phases studied, except AmFe$sub 2$, exhibit almost temperature-independent paramagnetism. ... continued below

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6 p.

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Aldred, A.T.; Dunlap, B.D.; Lam, D.J. & Shenoy, G.K. September 1, 1975.

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An investigation was made of a series of binary americium alloys with AB$sub 2$ stoichiometry (B = Al, Co, Fe, Rh and Ru) prepared from the $sup 243$Am isotope. The C-15 (MgCu$sub 2$-type) structure appears in AmAl$sub 2$, AmCo$sub 2$, AmFe$sub 2$, and AmRh$sub 2$, whereas AmRu$sub 2$ is isostructural with AmOs$sub 2$ which has the C-14 (MgZn$sub 2$-type) structure. The magnetic properties of the cubic americium laves phases were studied by means of magnetization and nuclear gamna-ray resonance (Moessbauer effect) measurements between 2.5 and 300$sup 0$K. All the cubic Laves phases studied, except AmFe$sub 2$, exhibit almost temperature-independent paramagnetism. The AmFe$sub 2$ sample is ferromagnetic with an estimated Curie temperature of approximately 400$sup 0$K. The hyperfine field at the Am site in all the compounds is small. The bulk magnetic moment of AmFe$sub 2$ (approximately 3 $mu$/sub B//F.U.) is thus associated only with the Fe atoms. The magnetic properties of the compounds are consistent with the assumption that the Am ion is in the +3 state (5f6). (auth)

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6 p.

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  • 4. international transplutonium elements symposium, Baden-Baden, F.R. Germany, 13 Sep 1975

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  • Report No.: CONF-750913--15
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 4179873
  • Archival Resource Key: ark:/67531/metadc865358

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  • September 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 1:43 p.m.

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Aldred, A.T.; Dunlap, B.D.; Lam, D.J. & Shenoy, G.K. Crystal structure and magnetic properties of americium laves phases, article, September 1, 1975; Illinois. (digital.library.unt.edu/ark:/67531/metadc865358/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.