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Issue Eur. Phys. J. Appl. Phys.
Volume 22, Number 2, May 2003
Page(s) 97 - 101
Section Plasmas, Discharges and Processes
DOI 10.1051/epjap:2003028
Published online 06 May 2003

Eur. Phys. J. AP 22, 97-101 (2003)
DOI: 10.1051/epjap:2003028

Non-contact measurement technique of the vapor pressure of liquid and high temperature solid materials

P.-F. Paradis, T. Ishikawa and S. Yoda

National Space Development Agency of Japan, Tsukuba Space Center, 2-1-1 Sengen, Tsukuba City, Ibaraki, 305-8505, Japan

paradis.paulfrancois@nasda.go.jp
ishikawa.takehiko@nasda.go.jp
yoda.shinichi@nasda.go.jp

(Received: 25 March 2002 / Received in final form: 5 November 2002 / Accepted: 12 February 2003 Published online: 6 May 2003 )

Abstract
Here is reported a new scheme to accurately determine the vapor pressure of undercooled, liquid, and high temperature solid materials. The method relies on an imaging technique that measures the time variation of the radius of an electrostatically levitated sample. This scheme, compared to other techniques, offers unique opportunity to explore not only the liquid above the melting point but also the undercooled states of highly reactive materials in a contamination free environment. This was exemplified in this paper with titanium. For the first time, we report the vapor pressure  $(V_{\rm p})$ of its liquid phase over a large temperature range, covering the undercooled region. Over the 1700 to 2050 K temperature range, it was measured as Log $V_{\rm p}(T) = 9.154 - 17978\ T^{-1}$ (3%). Similarly, for high temperature solid titanium, the vapor pressure could be expressed as Log $V_{\rm p}(T) = 16.634 - 32960\ T^{-1}$ (6%) over the 1770 to 1940 K temperature interval. From these data, the average latent heats of vaporization and sublimation were calculated respectively as 344.8 kJ/kg (8%) and 632.1 kJ/kg (6%) respectively.

PACS
81.70.Fy - Nondestructive testing: optical methods.
65.20.+w - Thermal properties of liquids: heat capacity, thermal expansion, etc..
65.40.-b - Thermal properties of crystalline solids.

© EDP Sciences 2003


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