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Quantum Functional Materials Design Lab
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The lab uses positrons and computation to investigate defects in materials at the atomic level.
AboutAbout the lab
Unraveling the mysteries of materials through the eyes of atoms
The Araki Lab (Quantum Functional Materials Design) uses positrons, the antimatter counterpart of electrons, to observe the internal structure of materials at the atomic scale.
The lab investigates how metallic materials such as aluminum alloys for automobiles and high-strength steels, high-entropy alloys, and alloys made with metal 3D printers come to show excellent properties.
By combining experiments using positrons with computer simulation based on first-principles calculations, the lab conducts research aimed at designing new materials.
Key terms
- Positron
- The antimatter counterpart of the electron. When it meets an electron, the two annihilate and emit two gamma rays traveling in opposite directions
- Lattice defect
- A disruption in the arrangement of atoms in a crystal, such as vacancies where atoms are missing, and dislocations
- First-principles calculations
- Calculations that predict the properties of materials from the level of atoms and electrons, based on quantum mechanics
- High-entropy alloy
- An alloy in which many types of elements are mixed uniformly
ResearchResearch themes
In this lab, positrons are injected into a material, and the gamma rays emitted when they annihilate with electrons are measured to investigate the fine structure of metals and semiconductor materials at the atomic level. Based on the knowledge gained from experiments and first-principles calculations, the lab works toward designing new materials with excellent properties.
Analysis of lattice defects using positrons
Using positron annihilation lifetime measurement and Doppler broadening measurement, the lab evaluates fine structures such as vacancy-type defects and dislocations with high sensitivity.
*Illustrative imageMaterials design using first-principles calculations
Using first-principles calculations, the lab predicts defect formation and material properties, and provides guidelines for designing materials.
*Illustrative imageMechanisms behind the properties of high-entropy alloys
For high-entropy alloys, the lab clarifies the relationship between local internal structure and properties, and applies this to materials development.
*Illustrative imageDefect evaluation in alloys made by metal 3D printing
The lab evaluates the defects and residual stress specific to materials made by metal 3D printing (additive manufacturing, AM), contributing to improved reliability.
MembersFaculty
The members of the Araki Lab consist of faculty members and master's and undergraduate students.As of 2026
- ProfessorHideki Araki
- Associate ProfessorMasataka Mizuno
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: “ORNL Electron Microscope ( )” ENERGY.GOV / Public domain (cropped)
- Materials design using first-principles calculations: “Pyrope crystal structure” Kent G. Budge / CC BY-SA 4.0 (cropped)
- Mechanisms behind the properties of high-entropy alloys: “Microstructure of High-Entropy Alloy AlCoCrFeNi₂.₁” OndrejAmbroz / CC BY 4.0 (cropped)
- Defect evaluation in alloys made by metal 3D printing: “SEM photo of 316L Stainless Steel metal powder atomized with ATO Lab Plus ultrasonic metal atomizer” Michaltoczko / CC BY 4.0 (cropped)
- Related lab (Nanostructure and Function Characterization Lab [Institute of Scientific and Industrial Research]): “Transmission Electron Microscope (NIH BioArt 514)” Courtesy of NIAID Ryan Kissinger / Public domain (cropped)
- Related lab (Materials Thermodynamics Lab): “Transferring molten metal from the furnace to the ladle” Goodwin Steel Casting / CC BY-SA 2.0 (cropped)
- Related lab (Computational Materials Design Lab): “Mcbirneyite crystal structure (Coing-Boyat 1982) polyhedra model free axis” Ra'ike (Wikipedia) / CC0 (cropped)
- Related lab (Materials Structural Integrity Evaluation Lab): “Steel Girder Bridge - geograph.org.uk - 6113684” David Robinson / CC BY-SA 2.0 (cropped)
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