| Subjects |
Giant Particle Size Effect on Phase Transitions in Dielectric Crystals |
| Representative researcher |
Tokyo Institute of Technology Hitoshi KAWAJI |
| Joint researcher |
Tokyo Institute of Technology Tooru ATAKE |
| Tokyo Institute of Technology Isao YAMASHITA |
| Tokyo Institute of Technology Yusuke KODERA |
| Giant particle size effect
was found in several dielectric crystals. In the case of
III-IV phase transition of CsZnPO4 (CZP), it was not observed
for single crystals smaller than 0.1 mm, while the larger
crystals than 0.25 mm showed the structural phase transition
at 220 K. The thermodynamic studies were made by high-percision
adiabatic calorimetry, by high-energy synchrotron-radiation
X-ray diffractometry at SPring-8, and by polarization microscope.
The anomaly due to the phase transition could be seen in
the the heat capacity curve, and the structural change was
detected in the diffracton data. The mechanism of the phase
transition was discussed. |
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