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Nanostructure Control Lab
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The lab uses electron microscopy to clarify the nanostructures of materials.
AboutAbout the lab
Exploring materials science through electron microscopy.
The Yamamoto Lab uses transmission electron microscopy to analyze the structure of materials at the nanometer scale.
Under the theme of materials science through electron microscopy, the lab works on analyzing interfaces between solids, clarifying the mechanisms of flash sintering, and clarifying how materials fracture.
It uses methods for observing changes in materials in situ inside an electron microscope, as well as sample preparation techniques based on a focused ion beam.
Key terms
- Transmission electron microscope
- A microscope that passes an electron beam through a thinned sample and magnifies it enough to see the arrangement of atoms
- Flash sintering
- A method in which compacted powder is heated while a voltage is applied, and is sintered in a short time at the moment the current suddenly increases
- Pulsed laser deposition
- A method that fires short laser pulses at a material and deposits the ejected atoms onto a substrate to form a thin film
ResearchResearch themes
The lab analyzes nanostructures with transmission electron microscopy to investigate interfaces between solids, the mechanisms of flash sintering, and how materials fracture. It also works on the sintering of ceramics, control of the surface structure of oxide crystals, and structural analysis of thin films.
*Illustrative imageFlash Sintering with Controlled Shrinkage Rate
The lab produces zirconia sintered bodies by combining flash sintering with a sintering method that controls the shrinkage rate. It evaluates the hardness and resistance to cracking of the resulting sintered bodies.
*Illustrative imageEngineering Steps on Crystal Surfaces
The lab is developing techniques to precisely control the structure of steps (atomic-scale height differences) and terraces (flat surfaces) on the surface of complex oxide crystals, which are commonly used as substrates for growing thin films. By changing how readily cations are removed from within the crystal, it adjusts the surface structure.
*Illustrative imageStructure and Properties of Barium Titanate Thin Films
For barium titanate, which is used in dielectric materials such as capacitors, the lab fabricates thin films with different compositional ratios by pulsed laser deposition, observes their fine structure, and evaluates their properties.
*Illustrative imageFlash Sintering of Strontium Titanate
In strontium titanate, where even a slight difference in compositional ratio greatly changes crystal defects, the lab compares the behavior of flash sintering with that of conventional sintering. It found that in samples with slightly more titanium, the temperature at which flash occurs drops significantly.
MembersFaculty
The members of the Yamamoto Lab are faculty and graduate and undergraduate students.As of 2019
- ProfessorTakahisa Yamamoto
- Associate ProfessorTomoharu Tokunaga
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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: “Transmission electron microscope circa 1960” CDC/ Dr. Hogan / Public domain (cropped)
- Flash Sintering with Controlled Shrinkage Rate: “Dense pellet forming10” Dominik Bejma, Marta Kowalkińska / CC BY-SA 4.0 (cropped)
- Engineering Steps on Crystal Surfaces: “Atomic Force Microscope 01” Gannu03 / CC BY-SA 4.0 (cropped)
- Structure and Properties of Barium Titanate Thin Films: “Multicrystalline silicon wafer with thin film iridescence” Radiotrefoil / CC BY-SA 4.0 (cropped)
- Flash Sintering of Strontium Titanate: “CaTiO3 perovskite structure” Solid State / CC BY-SA 3.0 (cropped)
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