Piezo Crystals Group

Investigation of New Functional Materials using Bulk or Fiber Single Crystal
Developing of piezo-electric crystals for acoustic wave filter of mobile terminal. From the viewpoint of acoustic properties KNbO3 crystal was reported as good crystal, but it was difficult to grow high quality crystal. We can grow KNbO3 crystal by our original growth technique.


Principal Investigator: Hideo KIMURA

KNbO3 fiber crystal : smaller than 1 mm diameter


  

Study on the Anchor Effect on Adherance of Ultra Hard Coatings by a
Plasma Source Ion Implantation (PSII)
DLC (diamond like carbon) coating has fine tribological properties such as low friction coefficient, high hardness, and high erosion resistance. DLC can be coated by PSII on complex shape parts at room temperature but adherence is insufficient. This study aims to fabricate DLC coatings adhered with micro anchors by PSII and an etching method using aluminum oxide masks.
DLC coating method


Principal Investigator: Hitoshi SHINNO
Adhesion improvement of DLC coatings on metal substrates with surface micro holes by PSII.

Study on polarization property of elastic wave filter

The piezoelectricity of a chemical compound is caused by the displacement of ions in a crystal due to the distortion of the crystal structure. It is known that some additives in a crystal induce such an effect.. The detailed knowledge of electric properties and the feedback from them are necessary in the manufacturing processes of highly functional materials. In this study, we intend to establish the methods of analysis to the electrical properties of materials from the change in electric potential and current with time under a given electric field.


Principal Investigator: Hiroaki NAKAMURA


          

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