Combination of pulsed light heating thermoreflectance and laser-heated diamond anvil cell for in-situ high pressure-temperature thermal diffusivity measurements
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-07-01 |
| Journal | Review of Scientific Instruments |
| Authors | Akira Hasegawa, Takashi Yagi, Kenji Ohta |
| Institutions | Tokyo Institute of Technology, National Institute of Advanced Industrial Science and Technology |
| Citations | 30 |
Abstract
Section titled āAbstractāBy combining thermoreflectance measurements and laser heated diamond anvil cell (LHDAC) techniques, an instrument for the measurement of in situ high pressure-temperature thermal diffusivity of materials was developed. In an LHDAC system, high-power continuous-wave laser beams irradiate both faces of a disk-shaped metal sample loaded into diamond anvil cells (DACs), to maintain a stable high-temperature condition. During the operation of the LHDAC system, temperature of the sample is determined from the thermal radiation spectrum between 640 and 740 nm to fit Planckās law. Subsequently, a pulsed laser beam irradiates the metal disk to induce a temperature gradient inside the sample, and the transient temperature, caused by heat diffusion, is measured by a continuous wave probe laser based on the thermoreflectance phenomenon. We determined the thermal conductivities of Pt and Fe up to approximately 60 GPa and 2000 K using the measured thermal diffusivities and obtained values consistent with previous works. The uncertainties in the pressure and the temperature are estimated to be approximately 10%, and that in the thermal conductivity is estimated to approximately 15%. The system developed in this study enables us to determine thermal transport properties of materials under pressure-temperature conditions of the deep Earth.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2008 - Core-mantle boundary heat flow [Crossref]
- 1940 - The thermal conductivity of rocks and its dependence upon temperature and composition [Crossref]
- 1940 - The thermal conductivity of rocks and its dependence upon temperature and composition. Part II [Crossref]
- 1968 - Thermal diffusivity measurement of rock-forming minerals from 300Ā° to 1100Ā°K [Crossref]
- 1971 - Thermal conductivity of rock-forming minerals [Crossref]
- 1984 - Thermal conductivity of solids and liquids under pressure [Crossref]
- 1968 - Thermal diffusivity of Mg2SiO4, Fe2SiO4, and NaCl at high pressures and temperatures [Crossref]
- 1978 - Lattice conductivities of single-crystal and polycrystalline materials at mantle pressures and temperatures [Crossref]
- 1997 - Thermal diffusivity of periclase at high temperatures and high pressures [Crossref]
- 2004 - Thermal diffusivity and conductivity of olivine, wadsleyite and ringwoodite to 20 GPa and 1373 K [Crossref]