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Structure and transport properties of the R2Co2Al compounds (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Y)

  • M. Pani , F. Merlo and M. L. Fornasini
Published/Copyright: September 25, 2009
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 217 Issue 7-8

Abstract

The new R2Co2Al compounds (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Y), studied by single crystal and powder X-ray diffraction, crystallize with the W2CoB2 structure type. Pr2Co2Al is dimorphic, showing also its own monoclinic structure (a=9.595 Å, b=5.602 Å, c=7.753 Å, β=103.89°), which is closely related to the W2CoB2 type. Both structures are based on different packing of chains of cobalt-centred double trigonal prisms formed by rare earth and aluminum atoms. The electrical resistivity, measured in the 13-300K temperature range for all phases (save Y2Co2Al), always shows a transition point at temperatures going from 14K for Tm2Co2Al to 94K for Tb2Co2Al. As already found for Gd2Co2Al, these points should correspond to an order-disorder magnetic transition, and the deviations from de Gennes scaling indicate the influence of both the crystalline electric field and the strong coupling between 4f and conduction electrons.

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Published Online: 2009-9-25
Published in Print: 2002-7-1

© 2002 Oldenbourg Wissenschaftsverlag GmbH

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https://doi.org/10.1524/zkri.217.7.415.23677

Articles in the same Issue

  1. Crystallography and crystallographers. Personal reflections on the past, the present and the future of crystallography on the occasion of the 125-year anniversary of Zeitschrift für Kristallographie
  2. Protein Crystallography is Dead: Long Live Protein Crystallography!
  3. Crystallography 1946–2002
  4. Dear Prof. Dr. Steurer,
  5. What is Crystallography? A personal opinion
  6. Statement
  7. Crystallography through the Eyes of a Small-Angle Scatterer
  8. Personal reflections. Part 07
  9. Personal reflections. Part 08
  10. Personal reflections. Part 09
  11. Complex materials: Beyond Crystallography
  12. Crystallography, the basic science, in Africa
  13. Personal reflections. Part 12
  14. Personal reflections. Part 13
  15. Crystallographic Computing from Beevers-Lipson Strips to Information Technology
  16. Recovering Transdisciplinarity
  17. Crystallography in a Crisis?
  18. Personal reflections. Part 17
  19. Personal reflections. Part 18
  20. Crystallization of Proteins
  21. A future for “Expert” Crystallography?
  22. A bright future for powder diffraction
  23. Personal Reflections on Crystallography
  24. Crystallography. Quo vadis?
  25. Congratulations on the 125th anniversary of Zeitschrift für Kristallographie
  26. Crystallography: A Great Past, An Uncertain Future
  27. My View Points on the Questionnaire on Crystallography
  28. Why crystallography?
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  46. Highs and Lows
  47. Antiquated Crystallography?
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  52. Whither Crystallography?
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  55. Personal reflections. Part 54
  56. Personal reflections. Part 55
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  58. Very short answers to the questions about problems and future of crystallography:
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  92. Personal reflections. Part 91
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  95. X-ray Crystal Structure Analysis in Manchester: from W L Bragg to the Present Day
  96. The role of powder diffraction in materials science
  97. Some question of crystallography I´d like to see answered
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  101. Form and folding of pentameric human serum Amyloid P component
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