Pressure-induced phase transitions in bulk Zn1-xMnxSe

Abstract

Energy-dispersive X-ray-diffraction (EDXD) is used to study the pressure-induced transitions of Zn1-xMnxSe bulk samples, x = 0.016, 0.026, 0.053, 0.07, and 0.24, below 30 GPa. The EDXD results show that possible structure transitions from the zinc blende (B3) to the sodium chloride phase (B1) for Zn0.984Mn0.016Se. Zn0.974Mn0.026Se, Zn-0.947 Mn0.053Se, Zn0.93Mn0.07Se, and Zn0.76Mn0.24Se occur at 13.1, 12.4, 12.0, 11.8, and 9.6 GPa, respectively, The unloading run (the measurement with decreasing pressure) reveals that a reversible phase transition exists in the bulk Zn1-xMnxSe. In this work, our EDXD data show that the larger the increase of the fractional volume change at the phase transition from the B3 to the B1 region, the larger is the decrease of the reduction of the semiconductor-metal phase transition pressure. (C) 2001 Elsevier Science B.V. All rights reserved.