Phase relationships and crystallography in the pseudobinary system Gd5Si4---Gd5Ge4 |
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Authors: | V K Pecharsky and K A Gschneidner Jr |
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Affiliation: | Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-3620, USA |
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Abstract: | A study of phase relationships and crystallography in the pseudobinary system Gd5(SixGe1−x)4 revealed: (1) that both terminal binary compounds Gd5Si4 and Gd5Ge4 crystallize in the Sm5Ge4-type orthorhombic structure, and (2) the appearance of an intermediate (ternary) phase with a monoclinic crystal structure which is similar to both Gd5Si4 and Gd5Ge4. The formation of the monoclinic phase at 0.24≤x≤0.5 between Gd5(Si0.96Ge3.03)Gd5(Si1Ge3) and Gd5(Si2Ge2)] is probably due to the large difference in bonding characteristics of Si and Ge in the Gd5Si4-Gd5Ge4 pseudobinary system which limits the ability of the mutual substitution of Si for Ge and vice versa without a change of the crystal structure. For the composition Gd5(Si2Ge2) the lattice parameters of the monoclinic structure (space group P1121/a) are a=7.580865), b=14.802(1), c=7.7799(5)Å, γ=93.190(4)°. A distinct difference in the magnetic behaviors of the alloys from three different phase regions in this system follows the distinct difference in the crystal structures observed for the alloys from the three phase regions. |
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Keywords: | Crystallography Monoclinic crystal structure Gd5(SixGe1−x)4 Pseudobinary system Phase relationships |
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