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Materials Development Division
Advanced Crystal Engineering

Novel functional crystals and advanced sensors for future

We are interested in the phenomena and response of crystals to energy delivered from outside. Our studies are carried out from three main aspects. 1) Materials design from both physical and chemical aspects. 2) Development of materials elaboration process. 3) Characterization and understanding the phenomena and their correlation with crystal composition and technology. When the crystalswith high potential for practical use are found, we start intense research of not only the material itself, but also related devices and equipment. For the development of novel functional crystals, we use two processes; One is material composition screening and the other is the high quality crystal growth. Concerning the composition screening we employ the micro-pulling down methoddeveloped in our laboratory that allows us to grow crystals from the melt severaltimes faster when compared to the conventional methods. For the high quality crystal growth, we use Czochralski process. Therefore, not only the lower-quality crystals grown in the screening process, but also high quality crystalsare characterized. So far, gamma-ray or neutron scintillators such as (Pr:LuAG; Fig. 1), Ce:GAGG (Fig. 2), SrI2 and Ce:La-GPS have been developed in this laboratory. In addition, piezoelectric crystal (e.g. CTGAS) for low-power consumption oscillator is also being developed (Fig. 3). We contribute to science and technology for energy, environment and security with our novel functional crystals. We are carrying out our research activity based on the above mentioned policy and strategy with great effort and will.

Prof.Akira YOSHIKAWA

Assist. Prof.
Yuji OHASHI

Assist. Prof.
Akihiro YAMAJI

(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.

Keywords
scintillator crystal, piezoelectric single crystal, micro-pulling-down method, czochralski method, bridgeman method