Optical properties (at 684.5 nm) and radiance temperatures at the melting point of group Vlllb transition metals cobalt, nickel, palladium, and platinum

Claus Cagran, Boris Wilthan, Gernot Pottlacher

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Optical constants (index of refraction n and extinction coefficient k) and normal spectral emissivities of liquid cobalt, nickel, palladium, and platinum were measured with a division-of-amplitude photopolarimeter (DOAP) operating at 684.5 nm. The polarimeter is part of a pulse-heating apparatus using resistive self-heating of conducting specimens from room temperature to the upper limit of the liquid state in less than 50 μs. The temperature during the experiments (except for nickel) was simultaneously determined with a fast optical pyrometer operating at 650 nm. Additionally, radiance temperatures at melting at 684.5 nm calculated from emissivity and the melting temperature are presented for all four materials. The meltingpoint emissivities (normal spectral)/radiance temperatures at 684.5 nm, obtained by averaging several experimental results from each material, are: 0.346/1623.1 K for cobalt, 0.365/1595.8 K for nickel, 0.360/1678.8 K for palladium, and 0.364/1858.9 K for platinum. The results for all determined optical properties are given as melting-point values as well as linear least-squares fits to the liquid state. The uncertainty for emissivity and optical constants (with a coverage factor of k * = 2) is estimated and reported.

Original languageEnglish
Pages (from-to)667-675
Number of pages9
JournalHigh temperatures, high pressures
Volume35-36
Issue number6
Publication statusPublished - 2003

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Palladium
Cobalt
Platinum
Nickel
radiance
emissivity
melting points
Transition metals
Melting point
palladium
platinum
cobalt
Optical properties
transition metals
nickel
optical properties
Optical constants
Liquids
liquids
optical pyrometers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Mechanics of Materials

Fields of Expertise

  • Advanced Materials Science

Cite this

Optical properties (at 684.5 nm) and radiance temperatures at the melting point of group Vlllb transition metals cobalt, nickel, palladium, and platinum. / Cagran, Claus; Wilthan, Boris; Pottlacher, Gernot.

In: High temperatures, high pressures, Vol. 35-36, No. 6, 2003, p. 667-675.

Research output: Contribution to journalArticleResearchpeer-review

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abstract = "Optical constants (index of refraction n and extinction coefficient k) and normal spectral emissivities of liquid cobalt, nickel, palladium, and platinum were measured with a division-of-amplitude photopolarimeter (DOAP) operating at 684.5 nm. The polarimeter is part of a pulse-heating apparatus using resistive self-heating of conducting specimens from room temperature to the upper limit of the liquid state in less than 50 μs. The temperature during the experiments (except for nickel) was simultaneously determined with a fast optical pyrometer operating at 650 nm. Additionally, radiance temperatures at melting at 684.5 nm calculated from emissivity and the melting temperature are presented for all four materials. The meltingpoint emissivities (normal spectral)/radiance temperatures at 684.5 nm, obtained by averaging several experimental results from each material, are: 0.346/1623.1 K for cobalt, 0.365/1595.8 K for nickel, 0.360/1678.8 K for palladium, and 0.364/1858.9 K for platinum. The results for all determined optical properties are given as melting-point values as well as linear least-squares fits to the liquid state. The uncertainty for emissivity and optical constants (with a coverage factor of k * = 2) is estimated and reported.",
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AU - Cagran, Claus

AU - Wilthan, Boris

AU - Pottlacher, Gernot

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N2 - Optical constants (index of refraction n and extinction coefficient k) and normal spectral emissivities of liquid cobalt, nickel, palladium, and platinum were measured with a division-of-amplitude photopolarimeter (DOAP) operating at 684.5 nm. The polarimeter is part of a pulse-heating apparatus using resistive self-heating of conducting specimens from room temperature to the upper limit of the liquid state in less than 50 μs. The temperature during the experiments (except for nickel) was simultaneously determined with a fast optical pyrometer operating at 650 nm. Additionally, radiance temperatures at melting at 684.5 nm calculated from emissivity and the melting temperature are presented for all four materials. The meltingpoint emissivities (normal spectral)/radiance temperatures at 684.5 nm, obtained by averaging several experimental results from each material, are: 0.346/1623.1 K for cobalt, 0.365/1595.8 K for nickel, 0.360/1678.8 K for palladium, and 0.364/1858.9 K for platinum. The results for all determined optical properties are given as melting-point values as well as linear least-squares fits to the liquid state. The uncertainty for emissivity and optical constants (with a coverage factor of k * = 2) is estimated and reported.

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