Structures and Phase Transitions of CePdGa: New Variants of the BaHg Structure Type.
New distorted variants of the cubic BaHg structure type have been synthesized in Ga flux. Multiple phases of CePdGa, which include an orthorhombic Pmnin structure (x = 3.21(2)), a rhombohedral R3m structure (x = 3.13(4)), and a cubic Fm3m superstructure (x = 2.69(6)), form preferentially depending o...
| Publicado en: | Journal of the American Chemical Society Vol. 134; no. 31; pp. 12998 - 13010 |
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| Autores principales: | , , , , , , , , , , |
| Formato: | Artículo |
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American Chemical Society
8/8/2012
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=78570874&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 78570874 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 8/8/2012 vid: 134 iid: 31 pid: 997 pub: American Chemical Society artinfo: ui: 78570874 10.1021/ja302812s ppf: 12998 ppct: 12 formats: tig: atl: Structures and Phase Transitions of CePdGa: New Variants of the BaHg Structure Type. aug: au: Francisco, Melanie C. Malliakas, Christos D. Macaluso, Robin T. Prestigiacomo, Joseph Haldolaarachchige, Neel Adams, Philip W. Young, David P. Ying Jia Claus, Helmut Gray, K. E. Kanatzidis, Mercouri G. affil: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States Department of Chemistry and Biochemistry, University of Northern Colorado, Greeley, Colorado 80639, United States Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States su: Intermetallic compounds Phase transitions Molecular structure Gallium Cerium Palladium sug: subj: Intermetallic compounds Phase transitions Molecular structure Gallium Cerium Palladium ab: New distorted variants of the cubic BaHg structure type have been synthesized in Ga flux. Multiple phases of CePdGa, which include an orthorhombic Pmnin structure (x = 3.21(2)), a rhombohedral R3m structure (x = 3.13(4)), and a cubic Fm3m superstructure (x = 2.69(6)), form preferentially depending on reaction cooling rate and isolation temperature. Differential thermal analysis and in situ temperature-dependent powder X-ray diffraction patterns show a reversible phase transition at approximately 640 °C between the low temperature orthorhombic and rhombohedral structures and the high temperature cubic superstructure. Single crystal X-ray diffraction experiments indicate that the general structure of BaHg, including the intersecting planes of a kagomé-type arrangement of Ce atoms, is only slightly distorted in the low temperature phases. A combination of Kondo, crystal electric field, and magnetic frustration effects may be present, resulting in low temperature anomalies in magnetic susceptibility, electrical resistivity, and heat capacity measurements. In addition to CePdGa, the rare earth analogues REPdGa RE = La, Nd, Sm, Tm, and Yb, were successfully synthesized and also crystallize in one of the lower symmetry space groups. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2012 holdings: @attributes: islocal: N |
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