Materials Design Division

Physics of Electronic Materials Research Laboratory



  • Asso. Prof. Yuui YOKOTA
  • Assist. Prof. Masao YOSHINO
  • Assist. Prof. Takashi HANADA

Novel Functional Crystals and Advanced Sensors for Future

We have developed novel functional crystals in joint effort between industry and academia covering the fields from upstream (designing materials) to downstream (developing devices). The material composition screening is immediately made by not only elaborating crystals but also evaluating responses of the crystals to energy delivered from outside such as light, radiation, pressure, and so on, and evaluating piezoelectric properties by accurate ultrasonic measurement technology, and then feeding it back to material design. When the crystals with high potential are found, we grow the crystals with high quality by Czochralski or Bridgeman methods which are suitable for mass production. So far, gamma-ray or neutron scintillators in practical use have been developed such as positron emission tomography (PET) for diagnosis of breast cancer, handy-type radiation dose monitor, gamma-ray camera, and so on. In addition, we are engaged in developing crystal growth technologies for such as langasite-type piezoelectric crystals for low-power consumption resonator and shape-control for difficultly deformable alloy for firing plug.

scintillator crystal, piezoelectric single crystal, micro-pulling-down method, czochralski method, bridgeman method
(a) Ce doped GAGG crystals. (b) gamma camera with Ce:GAGG.

(a) Ce doped GAGG crystals
(b) gamma camera with Ce:GAGG

(a) Alloys with poor workability (b)High-temperature-tolerantLa-GPS crystal and its light yield property

(a) Alloys with poor workability
(b) Quick screening for candidate crystals using Micro-Pulling Down method (unique and original technology)

(a) CTGAS crystal. (b) CTGAS equipped resonator. (c) Frequency response of resonator.

(a) CTGAS crystal (b) CTGAS equipped resonator (c) Frequency response of resonator

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