High-pressure-high-temperature study of Hg1-xMnxS

Investigation of the sphalerite to cinnabar transition for Hg-1 xMnxS (x=0. 02 and 0.07) is presented. The in situ high-pressure-high-temperature X-ray energy-dispersive experiments were performed using a high-volume X-ray dif fraction Dress at HASYLAB in the p-T range 0-60 kbar and 17-600 degrees C. At a given temperature, the transition pressure increases with the manganes e content in the sample. For x=0.02, the phase transition on uploading occu rs at 12.5 kbar and for x=0.07 at 24.4 kbar. The present observations are c onsistent with the literature data obtained at ambient pressure for samples prepared under a pressure of 18 kbar and quenched to the ambient pressure. The value of the bulk modulus for Hg0.93Mn0.07S is calculated to be 387.9 kbar. (C) 1999 Elsevier Science S.A. All rights reserved.