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Functional Properties Evaluation Lab (Collaborative Chair, NIMS)
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The lab identifies defects and interfaces in inorganic materials to bring out their optical and electronic functions.
AboutAbout the lab
Designing material functions from composition and structure.
The Functional Properties Evaluation Lab is a collaborative chair with the National Institute for Materials Science (NIMS), and studies how to design and control the crystal structure, chemical composition, and resulting electronic states of inorganic materials.
By understanding the behavior of impurities and defects in ceramics and thin films, as well as the state of interfaces, the lab aims to realize materials for light-emitting materials, semiconductor devices, sensors, and secondary batteries.
Based on solid-state physics and solid-state chemistry, the lab synthesizes crystals, deposits thin films, and evaluates materials using high-resolution electron microscopy and other methods.
The research is conducted at NIMS (Tsukuba).
Key terms
- Lattice defect
- A place in a crystal where the arrangement of atoms is disordered. This includes vacancies, where an atom is missing.
- Stable isotope
- An isotope that does not emit radiation. For example, oxygen with mass number 18 can be used as a tracer.
- Focused ion beam
- A device that mills a sample with a finely focused beam of ions. Abbreviated as FIB.
ResearchResearch themes
Based on solid-state physics and solid-state chemistry, the lab carries out developmental research related to crystal growth and evaluates materials using electron microscopes and nanoscale chemical composition analysis equipment. Each faculty member works on clarifying the relationships among composition, structure, and properties, analyzing microstructures with electron microscopy, or studying lattice defects in oxides using stable isotopes.
Understanding the Relationships Among Composition, Structure, and Properties
The lab considers the electrical conductivity, light-emission properties, and surface and interface functions of crystals from the viewpoint of chemical composition, atomic arrangement, and chemical bonding, aiming to propose processes for creating new, low-environmental-impact substances and materials made of earth-abundant elements (Professor Naoki Ohashi).
Analyzing Microstructures with Electron Microscopy
The lab investigates the hierarchical and complex microstructures of structural materials using three-dimensional observation that combines a focused ion beam with a scanning electron microscope, along with X-ray spectroscopy, and advances microstructure analysis techniques themselves (Professor Toru Hara).
Probing Oxide Defects with Isotopes
The lab captures oxygen defects in oxides, which cannot be observed directly, as diffusion coefficients using stable isotopes such as oxygen with mass number 18, and applies this to evaluating the reliability of oxide devices (Associate Professor Isao Sakaguchi).
MembersFaculty
- ProfessorNaoki Ohashi
- ProfessorToru Hara
- Associate ProfessorIsao Sakaguchi
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