TY - JOUR

T1 - Variations in lattice parameters with annealing temperature for L-Pd5Ce

AU - Kuwano, Noriyuki

AU - Umeo, Kazunori

AU - Yamamoto, Keisuke

AU - Itakura, Masaru

AU - Oki, Kensuke

N1 - Funding Information:
This work was supportedin part by Grants-in-Aidfo r ScientificR esearch (grant 01550511) and for Encouragemenot f Young Scientists(g rant 02750522)fr om the Ministry of Education,S cience andC ultureof Japan.

PY - 1992/4/9

Y1 - 1992/4/9

N2 - 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.

AB - 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.

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U2 - 10.1016/0925-8388(92)90574-S

DO - 10.1016/0925-8388(92)90574-S

M3 - Article

AN - SCOPUS:0027115764

VL - 182

SP - 61

EP - 68

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

IS - 1

ER -