Structures and phase transitions of CePd 3+xGa 8-x

New variants of the BaHg 11 structure type

Melanie C. Francisco, Christos D. Malliakas, Robin T. MacAluso, Joseph Prestigiacomo, Neel Haldolaarachchige, Philip W. Adams, David P. Young, Ying Jia, Helmut Claus, K. E. Gray, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

New distorted variants of the cubic BaHg 11 structure type have been synthesized in Ga flux. Multiple phases of CePd 3+xGa 8-x, which include an orthorhombic Pmmn structure (x = 3.21(2)), a rhombohedral R3̄m structure (x = 3.13(4)), and a cubic Fm3̄m 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 11, 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 CePd 3+xGa 8-x, the rare earth analogues REPd 3+xGa 8-x, RE = La, Nd, Sm, Tm, and Yb, were successfully synthesized and also crystallize in one of the lower symmetry space groups.

Original languageEnglish
Pages (from-to)12998-13009
Number of pages12
JournalJournal of the American Chemical Society
Volume134
Issue number31
DOIs
Publication statusPublished - Aug 8 2012

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Phase Transition
Phase transitions
Temperature
X-Ray Diffraction
Differential Thermal Analysis
Frustration
Magnetic Fields
Magnetic susceptibility
Powders
Differential thermal analysis
Diffraction patterns
Rare earths
Specific heat
Hot Temperature
Electric fields
Single crystals
Fluxes
Cooling
X ray diffraction
X rays

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Francisco, M. C., Malliakas, C. D., MacAluso, R. T., Prestigiacomo, J., Haldolaarachchige, N., Adams, P. W., ... Kanatzidis, M. G. (2012). Structures and phase transitions of CePd 3+xGa 8-x: New variants of the BaHg 11 structure type. Journal of the American Chemical Society, 134(31), 12998-13009. https://doi.org/10.1021/ja302812s

Structures and phase transitions of CePd 3+xGa 8-x : New variants of the BaHg 11 structure type. / Francisco, Melanie C.; Malliakas, Christos D.; MacAluso, Robin T.; Prestigiacomo, Joseph; Haldolaarachchige, Neel; Adams, Philip W.; Young, David P.; Jia, Ying; Claus, Helmut; Gray, K. E.; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 134, No. 31, 08.08.2012, p. 12998-13009.

Research output: Contribution to journalArticle

Francisco, MC, Malliakas, CD, MacAluso, RT, Prestigiacomo, J, Haldolaarachchige, N, Adams, PW, Young, DP, Jia, Y, Claus, H, Gray, KE & Kanatzidis, MG 2012, 'Structures and phase transitions of CePd 3+xGa 8-x: New variants of the BaHg 11 structure type', Journal of the American Chemical Society, vol. 134, no. 31, pp. 12998-13009. https://doi.org/10.1021/ja302812s
Francisco MC, Malliakas CD, MacAluso RT, Prestigiacomo J, Haldolaarachchige N, Adams PW et al. Structures and phase transitions of CePd 3+xGa 8-x: New variants of the BaHg 11 structure type. Journal of the American Chemical Society. 2012 Aug 8;134(31):12998-13009. https://doi.org/10.1021/ja302812s
Francisco, Melanie C. ; Malliakas, Christos D. ; MacAluso, Robin T. ; Prestigiacomo, Joseph ; Haldolaarachchige, Neel ; Adams, Philip W. ; Young, David P. ; Jia, Ying ; Claus, Helmut ; Gray, K. E. ; Kanatzidis, Mercouri G. / Structures and phase transitions of CePd 3+xGa 8-x : New variants of the BaHg 11 structure type. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 31. pp. 12998-13009.
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