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- W2072982450 abstract "Pressure-volume relationships for the bcc transition metals in the groups VB (V, Nb, and Ta) and VIB (Cr, Mo, and W) were determined under hydrostatic pressure to 100 kbar at room temperature by means of x-ray diffraction, employing diamond-anvil pressure cell and the ruby (R1 line) fluorescence calibration technique. Using the measured ultrasonic K′0 values, where K0 is the bulk modulus at ambient pressure, for five metals and the deduced shock-wave K′0 value for Cr, the values of K0 for V, Nb, Ta, Mo, W, and Cr are calculated to be 1.54, 1.71, 1.94, 2.67, 3.07, and 1.93 Mbar, respectively, by least-squares fit of the experimental P-V data to the Birch-Murnaghan equation. The K0 values thus determined are in good agreement with the ultrasonic and shock-wave values for V, Nb, Ta, Mo, and W. For Cr, the K0 value (1.93 Mbar) is in agreement with the shock-wave value (1.92 Mbar) but not with the ultrasonic value (1.65 Mbar). This discrepancy can be explained in view of the paramagnetic→antiferromagnetic transition in Cr in the temperature proximity of the ultrasonic measurements (Neel temperature TN∼311 °K at 1 bar) and by the negative pressure dependence of TN." @default.
- W2072982450 created "2016-06-24" @default.
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- W2072982450 date "1978-01-01" @default.
- W2072982450 modified "2023-10-17" @default.
- W2072982450 title "Isothermal compression of bcc transition metals to 100 kbar" @default.
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- W2072982450 doi "https://doi.org/10.1063/1.324325" @default.
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