Materials Design Division

Advanced Crystal Engineering

Akira YOSHIKAWA

Prof.Akira YOSHIKAWA

  • Assist. Prof. Akihiro YAMAJI

Novel Functional Crystals and Advanced Sensors for Future

We have developed novel functional crystals in joint effort between industry and academia covering the fi elds 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 fi ring 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) SrI2spectrometer.  (b) High-temperature-tolerant La-GPS crystal and its light yield property.

(a) SrI2spectrometer. 
(b) High-temperature-tolerant La-GPS crystal and its light yield property.

(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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