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Ohta Lab
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A lab that investigates materials in the deep Earth and planets through ultrahigh-pressure experiments.
AboutAbout the lab
Exploring the deep Earth and planets through ultrahigh-pressure experiments
The Ohta Lab studies how materials inside the Earth and planets behave under high pressure.
Using a device called a diamond anvil cell, the lab creates ultrahigh pressures like those in the deep Earth and conducts experiments.
It examines the crystal structure of minerals and how they conduct electricity and heat, using the results as clues to the behavior of the Earth and planets over long timescales.
The lab also works on developing new methods for measuring the properties of minerals under extreme conditions.
Key terms
- Diamond anvil cell
- An experimental device that squeezes a sample between the tips of two diamonds to create ultrahigh pressures like those in the deep Earth
- Lower mantle
- The deep part of the mantle, a layer extending just outside the Earth's central core
- Post-perovskite
- A different crystal form into which the main mantle mineral changes under the high pressure at depths close to the boundary with the core
NewsLab news
View More ↗ResearchResearch themes
The lab examines the crystal structure of minerals and how they conduct electricity and heat under high-temperature, high-pressure conditions, aiming to understand the behavior of the Earth and planets over long timescales. Its main tool is high-pressure experiments using diamond anvil cells, and it also works on developing new methods for measuring physical properties under extreme conditions.
*Illustrative imageElectrical Conductivity of Deep Earth Materials
The lab investigates how well lower-mantle minerals, post-perovskite, and rocks of the mantle and oceanic crust conduct electricity. It also studies the phenomenon in which iron oxide becomes metallic at high temperature and pressure.
*Illustrative imageThermal Conductivity of the Mantle and Core
The lab develops techniques to measure heat transport using light pulses inside a diamond anvil cell. It measures the thermal conductivity and thermal diffusivity of mantle minerals.
*Illustrative imagePhase Transitions of Minerals in the Deep Earth
Using synchrotron X-rays at SPring-8 for in situ observation at high temperature and pressure, the lab determines the conditions under which mantle material transforms into post-perovskite. It also investigates the stability of iron-rich minerals in the lower mantle.
*Illustrative imageProperties of Hot, Dense Hydrogen
This research determines the boundary at which dense hydrogen changes from one liquid state to another while remaining liquid. The lab also measures how well dense liquid hydrogen conducts electricity.
MembersFaculty
The members of the Ohta Lab consist of faculty members, postdoctoral researchers, and PhD, master's, and undergraduate students.
- ProfessorKenji OhtaPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “DiamondAnvilCell 003” National Institute of Standards and Technology / Public domain (cropped)
- Electrical Conductivity of Deep Earth Materials: “Wüstite-110970” Pavel M. Kartashov / CC BY-SA 3.0 (cropped)
- Thermal Conductivity of the Mantle and Core: “Periclase-701220” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Phase Transitions of Minerals in the Deep Earth: “SPring-8” Koji101 / CC BY 3.0 (cropped)
- Properties of Hot, Dense Hydrogen: “Jupiter and its shrunken Great Red Spot” NASA, ESA, and A. Simon (Goddard Space Flight Center) / Public domain (cropped)
- Related lab (横山研究室): “Asteroid Ryugu (ann19006a)” JAXA, University of Tokyo & collaborators / CC BY 4.0 (cropped)
- Related lab (玄田研究室): “The Earth seen from Apollo 17” NASA/Apollo 17 crew / Public domain (cropped)
- Related lab (尾﨑研究室): “Blue Marble Western Hemisphere” NASA / Reto Stöckli / Public domain (cropped)
- Related lab (神田研究室): “Kuchinoerabujima island from Mt.Nagatadake” As6022014 / CC BY-SA 3.0 (cropped)
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