HIGH-PRESSURE HIGH-TEMPERATURE DIFFRACTION STUDY OF MNTE USING SYNCHROTRON-RADIATION

High pressure high temperature experiments for MnTe of NiAs type were performed using a synchrotron radiation as X-ray source and a cubic an vil X-ray diffraction press to produce nonambient sample environment. In the investigated range of pressure (0-67.5 kbar) on uploading and w ith following temperature rise from 296 to 1273 K (at 67.5 kbar), the structure type of MnTe is conserved. An earlier reported nonlinear beh aviour of lattice-parameter c(0) is not found in the present study. Po ssible reasons of this discrepancy are discussed. The value of bulk mo dulus and its pressure derivative were calculated from the pressure-vo lume dependence by fitting the Birch-Murnaghan equation.