Individual Fellowship project supported by Marie Skłodowska-Curie actions
Full project title: Development of the new internally-heated diamond-anvil cell for planetary mineral physics: Application to high-pressure melting of H2O ice
Starting date: 01/09/2017
Duration: 24 months
Project status: Closed
For the past few decades, diamond-anvil cell (DAC) has been commonly used to reproduce simultaneous high-pressure (P) and -temperature (T) conditions of deep planetary interiors. In particular, laser-heated DACs achieved ultrahigh P-T conditions corresponding to the centre of the Earth. However, laser fluctuation and a steep temperature gradient lead into large temperature uncertainty (ca.±10%), which is crucial when it comes to understanding detailed structures of deep planetary interiors. The major objective of this project is to develop a new heating system for the DAC that enables us to heat the sample stably and homogeneously. The basic design of the new heating system was adopted from a so-called internally-heated DAC (IHDAC). The IHDAC is the most advanced high P-T generating system, in which a metallic foil inside a sample chamber is heated through supplied electricity. The internal heating outperforms laser-heating in temperature uncertainty (ca.±5%), while producing equally high temperature. The Fellow plans to improve the conventional IHDAC by developing a micron-sized heater made of chemically inert metals that heat up an adjacent sample. This will be a significant improvement to make the new IHDAC highly versatile i.e. applicable to diverse samples, because the conventional IHDAC can heat only metals. This was due to the fact that the sample also served as a resistive-heater in the conventional system. The second objective of this project is to conduct high-pressure melting experiments on H2O ice using the new IHDAC system. H2O is a major constituent of planetary bodies in the outer solar system, such as Uranus and Neptune, also known as Ice Giants. The melting temperature of H2O under high-pressure conditions places important constraints on the internal structures of Ice Giants. However, previously reported melting curves of H2O show large discrepancies (±300 degC at P = 40 GPa), hence there is no clear-cut answer to a basic question whether H2O is in liquid or solid state in these planets. The new IHDAC possesses a great potential for solving the long-standing controversy of the H2O melting curve at high pressure and related planetary structures
- For more information on the diamond-anvil cell technique, please go to General Knowledge.
- For further details of the project please go to Research.
- If you have any queries or need further information regarding this project, please contact Emiko Sugimura-Komabayashi.
- [Public event] Doors Open Day 2019, Cockburn Museum, School of GeoSciences, University of Edinburgh (28th September, 2019)
– Link to Doors Open Day 2019
- 57th European High Pressure Research Group Meeting on High Pressure Science and Technology (EHPRG-2019), Prague, Czech Republic (1-6th September, 2019)
– Link to EHPRG-2019
- [Public event] Doors Open Day at King’s Buildings (29th September, 2018)
– Please refer to Doors Open Day 2019 for more details
- Earth & Planetary Science Seminar, School of GeoSciences, University of Edinburgh (29th November, 2018)
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 753858.
Copyright Emiko Sugimura-Komabayashi