Variations in lattice parameters with annealing temperature for L-Pd5Ce

Noriyuki Kuwano, Kazunori Umeo, Keisuke Yamamoto, Masaru Itakura, Kensuke Oki

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Abstract

The lattice parameters of L-Pd5Ce have been determined as a function of annealing temperature. L-Pd5Ce has a one-dimensional long-period superstructure derived from L12, and the long periodic direction is along [110] of the L12 lattice. At 873 K, the distance between adjacent anti-phase boundaries, or the domain size, is almost exactly M≡3 in units of the lattice spacing of (110) planes of L12 (≡=co), and the crystal structure is Pmma with the lattice parameters a=0.5700 mn, b=0.4062 nm and c=3co=0.8462 nm. The axes correspond to [110], [001] and [110] respectively of L12. When M is even, the space group of the structure is regarded as Bmmm for the above setting of the axes. As the annealing temperature is elevated to 973 K, the quantities a/21/2, b and 21/2co, which correspond to the lattice dimensions of the pseudocubic lattice of L12, then have an identical value to one another. The variation in lattice parameters is explained in terms of a rapid increase in M associated with atomic disordering. The observed lattice parameters indicate that the averaged atomic volume varies less than 0.2%. The small variation cannot be a cause of the distinct dependence of electrical resistivity upon the annealing temperature.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalJournal of Alloys and Compounds
Volume182
Issue number1
DOIs
Publication statusPublished - Apr 9 1992

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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