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The lattice compressibility and deformation in superhard tungsten tetraboride (WB4) solid solution with chromium (Cr) are investigated by high-pressure x-ray diffraction and x-ray absorption fine structure (XAFS) spectroscopy up to 54 GPa. In contrast to pure WB4, the c-axis softening is effectively suppressed in W0.9Cr0.1B4, and less compressibility is shown for the a- and c-axes in the entire pressure range. Meanwhile, the white-line peak of W L3-edge XAFS in W0.9Cr0.1B4shows an absence of the sudden intensity drop as previously observ
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