九州大学 · 医学
Kitamura教授の研究室では、酸化物半導体や ferroelectric結晶を対象に、スピンオーバーラップや欠陥工学に基づく電気的・構造的特性の制御を追求しています。特にLiTaO3系単結晶の化学 stoichiometry の制御が、スイッチング特性や内部電場に与える影響を精密に解明しており、次世代エレクトロニクス材料の開発に貢献しています。
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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