Isothermal compression of bcc transition metals to 100 kbar

Journal Article · Sun Jan 01 00:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324325· OSTI ID:5188257

Ming, L; Manghnani, M H

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 (R/sub 1/ line) fluorescence calibration technique. Using the measured ultrasonic K'/sub 0/ values, where K/sub 0/ is the bulk modulus at ambient pressure, for five metals and the deduced shock-wave K'/sub 0/ value for Cr, the values of K/sub 0/ 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 K/sub 0/ values thus determined are in good agreement with the ultrasonic and shock-wave values for V, Nb, Ta, Mo, and W. For Cr, the K/sub 0/ 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 T/sub N/approx.311 /sup 0/K at 1 bar) and by the negative pressure dependence of T/sub N/.

• Research Organization: Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822
• OSTI ID: 5188257
• Journal Information: J. Appl. Phys.; (United States), Vol. 49:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM
COMPRESSIBILITY
MOLYBDENUM
NIOBIUM
TANTALUM
TUNGSTEN
VANADIUM
BCC LATTICES
COMPRESSION
DENSITY
EQUATIONS OF STATE
LATTICE PARAMETERS
PRESSURE DEPENDENCE
SHOCK WAVES
VERY HIGH PRESSURE
X-RAY DIFFRACTION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIFFRACTION
ELEMENTS
EQUATIONS
MECHANICAL PROPERTIES
METALS
PHYSICAL PROPERTIES
REFRACTORY METALS
SCATTERING
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties