Laser-heated diamond anvil cell experiments at high pressure. melting curve of nickel up to 700 kbar

• Published in: Physics and chemistry of minerals Vol. 20; no. 2; pp. 86 - 90
• Main Authors: LAZOR, P, SHEN, G, SAXENA, S. K
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Berlin Springer 01.07.1993
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; Mineralogy; Mineralogy: general, methodology, regional studies; experimental studies; nickel; laser methods; melting; thermal effects; high pressure
• ISSN: 0342-1791; 1432-2021
• DOI: 10.1007/bf00207200

Laser-heated experiments in a diamond anvil cell have been performed on high pressure melting of Ni up to 700 kbar. The laser heating system consists of diamond anvil cell, Nd:YAG and argon lasers, spectrograph with diode array, computer with software, CCD camera with monitor and optics. Experiments on melting of tungsten, Ni and platinum at 1 bar outside the diamond anvil cell and melting of Ni < 80 kbar in the cell were carried out to check the system for pressure and temperature measurements. The results show that for solid pressure medium the uncertainties in measurements of pressure at the experimental spot vary between plus/minus 5 kbar at 100 kbar and plus/minus 25 kbar at 660 kbar. Spectroradiometrically determined temperature is reliable within plus/minus 70K. Melting was detected in situ by visual observation. The melting point of Ni at 660 kbar has been found to be 2557 plus/minus 66K.