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Tokiwa Lab
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The lab creates and evaluates functional materials for superconductivity, batteries, and radiation detection.
AboutAbout the lab
Making materials that harness the functions of electrons and ions
The Tokiwa Lab researches the development and evaluation of functional materials that take advantage of the functions of electrons and ions in matter.
The work centers on three types of materials: superconducting materials, lithium secondary battery materials, and semiconductor materials for radiation measurement.
The lab synthesizes new materials using equipment such as high-temperature, high-pressure generators, and evaluates them with physical property measurement systems and X-ray diffractometers.
Key terms
- Superconductivity
- A phenomenon in which, below a certain temperature (the critical temperature), a material shows characteristics such as zero electrical resistance.
- Cuprate superconductor
- A family of materials that share CuO2 planes responsible for superconductivity. Also called HTCS, they attract attention for their high critical temperatures.
- Cathode material
- One component of a lithium secondary battery. It is considered one of the keys that determine battery performance.
ResearchResearch themes
The Tokiwa Lab develops and evaluates materials, focusing on functional materials that take advantage of the functions of electrons and ions in matter: superconducting materials, lithium secondary battery materials, and semiconductor materials for radiation measurement. Samples are prepared using high-temperature, high-pressure generators and thin-film fabrication equipment, and the resulting samples are examined with characterization instruments.
*Illustrative imageMultilayer cuprate superconductors
The lab focuses on multilayer cuprate superconductors, which have three or more CuO2 planes per unit cell. It has become clear that the inner CuO2 planes are in an ideally clean state and reveal the intrinsic nature of the electronic state.
Cathode materials for lithium-ion batteries
For cathode materials, which determine battery performance, the lab uses high-temperature, high-pressure techniques to search for new materials with high capacity, high energy density, and high safety. It succeeded in synthesizing CaFe2O4-type LiMn2O4, which was found to show relatively good electrochemical properties.
*Illustrative imageSemiconductor crystals for radiation detection
To measure gamma rays and X-rays accurately, the lab works on synthesizing single-crystal samples of TlBr. TlBr has a high ability to capture radiation and is expected to be a material that operates at room temperature. The lab aims to produce high-quality crystals.
MembersFaculty
The Tokiwa Lab consists of faculty members, assistant professors, and master's and undergraduate students.As of 2024
- Faculty memberKazuyasu Tokiwa
- Assistant ProfessorYasusuke Tanaka
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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: “Lithium ion battery” Walter Davison / CC BY-SA 4.0 (cropped)
- Multilayer cuprate superconductors: “Suspension of a superconductor by a magnet” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), Jeffrey Quilliam, LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Semiconductor crystals for radiation detection: “Radiation Assessment Detector for Curiosity Rover” NASA / Public domain (cropped)
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