Materials Development Division

Crystal Chemistry Research Laboratory

Satoshi UDA

Prof.Satoshi UDA

  • Assoc. Prof. Junpei OKADA
  • Assist. Prof. Jun NOZAWA
  • Assist. Prof. Hiromasa NIINOMI

Lead New Growth Methods with Optimizing Interfacial Energies by Applying External Fields

Our laboratory, founded in 2003 as the crystal chemistry research laboratory of IMR, was based on the recognition that the development of almost every functional material and device in the area of information technology has been aided by the improvement of the associated single crystals. Our lab has been concerned with novel growth methods, mainly from a melt or a solution, focusing on the role of the local equilibrium and growth dynamics at the interface. The principle underlying our research is the use of the ‘freedom’ present at the interface. An increase in freedom allows a more variable growth process, while a decrease in freedom confines the growth conditions necessary to obtain a homogeneous crystal. Research areas associated with this principle are: (1) Growth under an applied electric field, (2) Growth of a new ferroelectric crystal that is both stoichiometric and congruent, and (3) Phase transition studies at a microscopic scale via colloidal crystallization.

crystal growth, chemical potential, applying external fields, solute partitioning
Atomic-scale visualization of crystallization process by colloidal crystals

Fig.1 Atomic-scale visualization of crystallization process by colloidal crystals. (a) Impurity partitioning during melt growth (b) Grain boundary segregation during polycrystallization (c) Two-dimensional nucleation (d) Kink generation and growth kinetics of steps

The reversible condensation and crystallization induced with the aid of intense plasmonic near-field in the proximity of the metal nanostructure.

Fig.2 The reversible condensation and crystallization induced with the aid of intense plasmonic near-field in the proximity of the metal nanostructure. This crystallization method allows us not only to control crystallization precisely but also to observe unprecedented dissolution process which has never been observed in spontaneous crystallization.

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