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摘要
The volumes of a disordered An(20) (Q(od) = 0.15), a disordered An(78) (Q(od) = 0.55) and an ordered An(78) (Q(od) = 0.81) were determined up to 9.569(10) GPa, 8.693(5) GPa and 9.765(10) GPa, respectively, using single-crystal X-ray diffraction. The volume variations with pressure for these samples are described with 4(th)-order Birch Murnaghan equations of state with V-0 = 669.88(7) angstrom(3), K-0 = 59.7(7) GPa, K' = 5.7(5), K '' = -0.8(2) GPa(-1) for disordered An(20), V-0 = 1340.48(10) angstrom(3), K-0 = 77.6(5) GPa, K-0' = 4.0(3), K '' = -0.59(9) GPa(-1) for disordered An(78) and V-0 = 1339.62(6) angstrom(3), K-0 = 77.4(6) GPa, K' = 4.2(4), and K '' = -0.7(1) GPa(-1) for ordered An(78). Along with data from previous studies (An(0) ordered, An(0) disordered and An(20) ordered), the volumes for the disordered samples were found to be up to similar to 0.3% larger than the ordered samples of the same composition. The disordered samples are softer than the ordered samples of the same composition by 4(1)% for An(0), 2.5(9)% for An(20) and essentially zero for An(78). The relationship between volume increase, density decrease, and decreasing bulk modulus with increasing disorder is in accordance with Birch's Law.
- 出版日期2010-12
- 单位Virginia Tech; 美国弗吉尼亚理工大学(Virginia Tech)
