Strength and structural phase transitions of gadolinium at high pressure from radial X-ray diffraction

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[1] Xiong, Lun
[2] Liu, Jing
[3] Bai, Ligang
[4] Li, Xiaodong
[5] Lin, Chuanlong
[6] Lin, Jung-Fu
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Xiong, Lun | 1600年 / American Institute of Physics Inc.卷 / 116期
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Lattice strength and structural phase transitions of gadolinium (Gd) were determined under nonhydrostatic compression up to 55GPa using an angle-dispersive radial x-ray diffraction technique in a diamond-anvil cell at room temperature. Three new phases of fcc structure; dfcc structure; and new monoclinic structure were observed at 25GPa; 34GPa; and; 53GPa; respectively. The radial x-ray diffraction data yield a bulk modulus K0=36(1) GPa with its pressure derivate K0′=3.8(1) at the azimuthal angle between the diamond cell loading axis and the diffraction plane normal and diffraction plane ψ=54.7°. With K0′ fixed at 4; the derived K0 is 34(1) GPa. In addition; analysis of diffraction data with lattice strain theory indicates that the ratio of differential stress to shear modulus (t/G) ranges from 0.011 to 0.014 at pressures of 12-55GPa. Together with estimated high-pressure shear moduli; our results show that Gd can support a maximum differential stress of 0.41GPa; while it starts to yield to plastic deformation at 16GPa under uniaxial compression. The yield strength of Gd remains approximately a constant with increasing pressure; and reaches 0.46GPa at 55GPa. © 2014 AIP Publishing LLC;
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