Abstract
AbstractCu2Sb‐type (Strukturbericht designation: C38) intermetallic compound Mn2Sb was studied up to 25.7 GPa at room temperature using the in situ synchrotron powder X‐ray diffraction (XRD) technique. Our results from the XRD analysis showed that the (C38)‐type Mn2Sb undergoes a pressure‐induced structural phase transition near 22.4 GPa. In the low‐pressure (LP) phase of Mn2Sb, an anisotropic compressibility was observed with greater compressibility along the a‐axis than the c‐axis. And the mechanism for the anisotropy of compressibility was discussed in terms of the stacking of crystallography. Fitted to a third‐order Birch–Murnaghan equation of state (BM‐EOS), the pressure–volume data of Mn2Sb yielded the stable lattice volume V0 = 109.45(3) Å3, bulk modulus B0 = 50.1(5) GPa, and its derivative $B'_{{\rm 0}} $ = 7.0(2) for the LP phase. We propose that the distortion of Mn(I)Sb4 tetrahedra may give rise to the structural instability of Mn2Sb under high pressure (HP).
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