Mitsuru Ishii

Title: Mitsuru Ishii: Innovator in Piezoelectric Ceramics and Boron Nitride Synthesis

Introduction

Mitsuru Ishii is a notable inventor based in Higashiyamato, Japan. He has made significant contributions to the field of materials science, particularly in the development of piezoelectric ceramics and the synthesis of cubic boron nitride. With a total of 3 patents to his name, Ishii's work has implications for various technological applications.

Latest Patents

Ishii's latest patents include advancements in piezoelectric ceramics. His invention involves piezoelectric ceramics containing PbO and TiO.sub.2 as principal constituents, along with 0.5 to 3.7 mol-% of Nd.sub.2 O.sub.3 and 0.2 to 1.5 mol-% of MnO.sub.2. This composition results in ceramics that exhibit a low dielectric constant and a minimal temperature coefficient of the delay of surface acoustic waves, making them suitable for surface acoustic wave devices. Additionally, he has developed a process for producing cubic boron nitride from hexagonal boron nitride. By incorporating at least 3% by weight of water into the raw material, Ishii's method allows for the synthesis of cubic boron nitride with higher purity and smaller crystallites under lower temperature and pressure conditions than conventional methods.

Career Highlights

Mitsuru Ishii is associated with Hitachi, Ltd., where he has been able to apply his innovative ideas in a corporate setting. His work has not only advanced the understanding of piezoelectric materials but has also improved the production processes for boron nitride, which is crucial for various industrial applications.

Collaborations

Ishii has collaborated with notable colleagues such as Kenzo Susa and Toshio Kobayashi. Their combined expertise has contributed to the successful development of new materials and processes in their respective fields.

Conclusion

Mitsuru Ishii's contributions to the fields of piezoelectric ceramics and boron nitride synthesis highlight his role as an influential inventor. His innovative patents continue to impact technology and materials science, showcasing the importance of research and development in these areas.