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Special Techniques Relevant to High-Pressure Studies

Interfacial tension measurement of Ni-S liquid using high-pressure X-ray micro-tomography

, , , , , , & show all
Pages 327-334 | Received 31 Jan 2008, Published online: 07 Oct 2008
 

Abstract

High-pressure, high-temperature X-ray tomography experiments have been carried out using a large volume toroidal cell, which is optimized for interfacial tension measurements. A wide anvil gap, which corresponds to a field of view in the radiography imaging, was successively maintained to high pressures and temperatures using a composite plastic gasket. Obtained interfacial tensions of Ni-S liquid against Na, K-disilicate melt, were 414 and 336 mN/m at 1253 and 1293 K, respectively. Three-dimensional tomo-graphy images revealed that the sample had an irregular shape at the early stage of melting, suggesting either non-equilibrium in sample texture and force balance or partial melting of surrounding silicate. This information cannot always be obtained from two-dimensional radiographic imaging techniques. Therefore, a three-dimensional tomography measurement is appropriate for the precise interfacial measurements.

Acknowledgements

The authors acknowledge M.L. Rivers for his technical assistance. This work was partly supported by the Bilateral Joint Projects/Seminars Program of the Ministry of Education, Culture, Science, Sport and Technology of the Japanese Government to S. Urakawa and by the 21st century Center-of-Excellence program ‘Advanced Science and Technology Center for the Dynamic Earth’ of Tohoku University. The experiments at APS have been performed under contract of the APS (Proposal number: GUP-7968).

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