Measurement of High Pressure at the Temperature of 600 to 760 ℃ by Melting Point of Plumbum

Melting points of Pb under high pressure were measured with the NiCr-NiSi thermocouple, using the cubic anvil type high pressure apparatus, so that the relation between pressure in cell and oil pressure was obtained according to the melting curve of Pb in the range from 600 to 760 ℃ for two assemblies of pressure mediums. The contrast result was clear, that the pressure in the cell was higher about 10%, when NaCl was used as the internal pressure medium than the pyrophylite was used under the same oil pressure.