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High-Pressure Materials Science Lab
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A lab that creates new inorganic materials in the world of ultrahigh pressure and ultrahigh temperature.
AboutAbout the lab
Creating new materials in the world of ultrahigh pressure
The Hasegawa Lab uses ultrahigh-pressure and ultrahigh-temperature environments to synthesize new materials that cannot be obtained at ordinary pressure.
A diamond anvil cell small enough to sit in the palm of a hand can generate pressures comparable to those at the center of the Earth.
Under ultrahigh pressure and temperature, a "supercritical fluid" appears that cannot be distinguished as either a gas or a liquid. Using it as the medium for reactions makes it possible to obtain highly crystalline materials in a short time.
The lab synthesizes inorganic compounds such as nitrides and oxides and clarifies their crystal structures and properties.
Key terms
- Diamond anvil cell
- A small device that generates ultrahigh pressure by squeezing a sample between the tips of two diamonds. The sample can also be heated with a laser.
- Supercritical fluid
- A state that appears at high temperature and pressure in which gas and liquid can no longer be distinguished. It dissolves substances well and reactions proceed quickly.
- Bulk modulus
- A measure of how hard a material is to compress when it is pressed from all sides. The larger it is, the harder the material is and the harder it is to crush.
- Phosphor
- A material that emits absorbed light as light of a different color. It is used in applications such as white LED lighting.
NewsLab news
A PhD student received the BCSJ Award at the 8th Solid State Chemistry Forum Workshop
A student received the Outstanding Presentation Award at the Department of Physical Science and Engineering undergraduate thesis defense
A master's student received the Excellence Award at the 35th Materials Forum TOKAI
Assistant Professor Takuya Sasaki received the Best Presentation Award at the 38th Fall Symposium of the Ceramic Society of Japan
Assistant Professor Takuya Sasaki received the Young Scientist Award at APAC-Silicide 2025
ResearchResearch themes
The lab develops its own techniques for synthesizing materials under ultrahigh pressure and creates new materials and crystals of a variety of inorganic compounds. It clarifies the stability, crystal structure, and properties of the materials it makes.
*Illustrative imageHard, Transparent Group 14 Nitrides
By reacting group 14 elements such as silicon, germanium, and tin directly with nitrogen under ultrahigh pressure, the lab synthesized pyrite-type nitrides, whose existence had been predicted by theory but which had not been synthesized before. They have a higher bulk modulus than the γ-type nitrides that have been made under high pressure, and are expected to lead to transparent, hard materials.
*Illustrative imagePolynitrides of Transition Metals
The lab synthesizes "polynitrides," which contain nitrogen atoms bonded to one another, under ultrahigh pressure. Following polynitrides of platinum-group elements, it has succeeded in synthesizing polynitrides of chromium, cobalt, and nickel, and through joint research it also examines their electronic states using synchrotron radiation.
*Illustrative imageNew Phosphors Made under High Pressure
The lab makes new phosphors that are difficult to synthesize at atmospheric pressure by using high pressure, and studies how to control the color of their emission. By examining crystal structures in detail, it clarifies how differences in structure relate to emission color.
*Illustrative imageNanocrystalline Ceramics
Ceramics made of nanosized grains show interesting properties, such as strength and optical transparency. By using high pressure to suppress grain growth, the lab has succeeded in synthesizing highly transparent nanoceramics.
MembersFaculty
The Hasegawa Lab consists of faculty members and doctoral, master's, and undergraduate students.As of 2026
- ProfessorMasashi Hasegawa
- Associate ProfessorKen Niwa
- Assistant ProfessorTakuya Sasaki
VoicesStudent voices
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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 002” National Institute of Standards and Technology / Public domain (cropped)
- Hard, Transparent Group 14 Nitrides: “Pyrite crystal structure (Bayliss 1977) along b axis” Ra'ike (Wikipedia) / CC0 (cropped)
- Polynitrides of Transition Metals: “Lithium-nitride-xtal-CM-3D-polyhedra” Ben Mills / Public domain (cropped)
- New Phosphors Made under High Pressure: “Light Emitting Diodes” Ingo Dierking / CC BY-SA 4.0 (cropped)
- Nanocrystalline Ceramics: “Yttralox transparent ceramic sample sitting on a wooden table” Richard C. Anderson / CC BY-SA 3.0 (cropped)
- Related lab (Rheology Physics and Engineering Lab): “Hand in a non-newtonian fluid 05” ElisaG87 / CC BY 4.0 (cropped)
- Related lab (Low-Temperature Physics and Engineering Lab): “Levitating HTS BSCCO piece (Meissner effect) - 2” Winiar / CC BY-SA 3.0 (cropped)
- Related lab (Electronic Functional Materials Lab): “Example of a Close Space Sublimation setup” Ash Pera / CC BY-SA 4.0 (cropped)
- Related lab (Strongly Correlated Materials Engineering Lab): “Vapor Crystal Growth System Furnace” NASA / Public domain (cropped)
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