Abstract
Investigation of the equation of state of molybdenum diboride (MoB2) has been performed to 24.1 GPa using synchrotron radiation angle-dispersive x-ray diffraction techniques (ADXRD) in a diamond anvil cell (DAC) at room temperature. Rietveld refinement of the X-ray powder diffraction data reveals that the rhombohedral structure MoB2 is stable up to 24.1 GPa. The ADXRD data yield a bulk modulus K0 = 314(11) GPa with a pressure derivative K0′ = 6.4(1.5). The experimental data are discussed and compared to the results of first-principles calculations. In addition, the compressibility of the unit cell axes (a and c axes) of MoB2 demonstrates an anisotropic property with pressure increasing.
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