Kyushu University · Medicine
Professor Kenji Kitamura's research lab specializes in functional oxide materials, particularly ferroelectric and piezoelectric single crystals such as LiTaO3. The lab focuses on the growth of high-quality, stoichiometric single crystals using advanced crystal growth techniques like the double crucible Czochralski method, aiming to minimize defects and internal fields. Their work explores the fundamental relationships between crystal composition, defect structure, and macroscopic properties such as switching fields and electrical behavior. The lab also investigates the influence of point defects on ferroelectric performance, contributing to the development of more efficient and stable materials for advanced electronic and photonic applications.
Figures are computed from collected data and may differ slightly.
We grew LiTaO3 single crystals with a composition close to stoichiometry by using a double crucible Czochralski method. The switching field required for 180° ferroelectric domain reversal and the internal fields originating from nonstoichiometric point defects were compared for the stoichiometric and conventional commercially available crystals. The switching fields for the domain reversal in the stoichiometric crystal with a Curie temperature of 685 °C was 1.7 kV/mm. This is about one thirteent
The effects of ACh on the smooth muscle cell membrane and mechanical property of the guinea-pig main coronary artery were observed by micro-electrode and isometric tension recording methods. 1. The membrane potential was low (--44 mV) and the membrane was electrically quiescent. Application of outward current pulse generated only a small graded response. The current--voltage relationship was linear for application of inward current pulses. 2. In low external Na or Cl solution the membrane was hy
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