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Tsuda Lab
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The lab quantitatively reads nanoscale crystal structures using a finely focused electron beam.
AboutAbout the lab
Reading crystal structure from a single nanoscale spot.
The Tsuda Lab analyzes local structures in materials using transmission electron microscopy and nano-sized electron probes.
In functional materials, a growing number of cases show unusual properties arising from nanoscale local structures and from crystal or domain interfaces, which makes investigating local crystal structure increasingly important.
Using convergent-beam electron diffraction (CBED), in which an electron beam focused to nanometer size is directed at the specimen, the lab was the first in the world to achieve quantitative local crystal structure analysis based on theoretical calculations.
Currently, the lab is working on analyzing inhomogeneous structures such as crystal interfaces and nanodomains, using methods that combine CBED with scanning transmission electron microscopy.
Key terms
- Convergent-beam electron diffraction (CBED)
- A method that directs a finely focused electron beam at a specimen and examines its structure from the pattern formed by scattering
- Electrostatic potential
- The distribution of electrical potential energy created by the charges of atoms inside a crystal
- Domain
- A region inside a crystal where the orientation of a property is uniform. The boundary between domains is called a domain interface
ResearchResearch themes
Convergent-beam electron diffraction, which uses an electron probe focused to nanometer size, is highly advantageous for investigating properties that arise from nanoscale local structures and from crystal or domain interfaces. The lab develops methods to quantitatively analyze the distribution of local crystal structure and electrostatic potential, with the aim of contributing to the development of new functional materials.
*Illustrative imageMeasuring structure with convergent-beam electron diffraction
Using CBED, the lab was the first in the world to realize a method for quantitatively analyzing local crystal structure based on theoretical calculations of multiple scattering. It is applied to ferroelectric ceramics, solid-state fuel cell materials, strongly correlated electron materials, and others.
*Illustrative imageViewing interfaces and domains with 4D-STEM
Using 4D-STEM, which combines scanning transmission electron microscopy with convergent-beam electron diffraction, the lab is developing methods to quantitatively analyze spatial variation in local structure and electrostatic potential in inhomogeneous structures such as crystal interfaces and nanodomains.
MembersFaculty
The Tsuda Lab's members are faculty, project researchers, secretaries, master's students, and technical staff.As of 2026
- ProfessorKenji Tsuda
- Associate ProfessorDaisuke Morikawa
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: “Electron microscopes” ann gav / CC BY 2.0 (cropped)
- Measuring structure with convergent-beam electron diffraction: “Laue-Cubic-Disoriented” Tizeff / CC BY-SA 3.0 (cropped)
- Viewing interfaces and domains with 4D-STEM: “Elektronenmikroskop” Stahlkocher / CC BY-SA 3.0 (cropped)
- Related lab (Saito Lab): “Molybdenite-251617” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Related lab (Nogami Lab): “Iron runners - Trumbull-Cliffs Blast Furnace” "New Trumbull-Cliffs 600-Ton Blast Furance", The Iron Age, September 15, 1921, p. 676 / Public domain (cropped)
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