Creating working jewels!
Monozukuri (Saitama University Research Seed Collection 2025-27 p.43)
Keywords: single crystal, ceramics, piezoelectric materials, lithium-ion batteries, thermistors
Diamonds, emeralds, rubies, sapphires... beautiful gemstones have captivated people since ancient times. These are not only used for jewelry; diamonds are utilized in polishing and cutting, rubies in lasers, and sapphires in blue LED substrates, demonstrating their industrial applications as well. We are conducting daily research with the aim of creating crystals that are useful to people (working gemstones). One example is high-temperature piezoelectric crystals, which can be used for safety management through non-destructive testing in geothermal and thermal power plants, environmental considerations via dust monitoring in chemical plants, and improving combustion efficiency through monitoring combustion pressure in automotive and marine engines. Currently, we have discovered melilite-type crystals as new materials and are working on scaling them up while evaluating their properties at high temperatures and designing and prototyping sensor structures. In addition to this theme, we are also engaged in the synthesis of solid electrolyte crystals that enable the all-solid-state lithium-ion batteries and the creation of microwave dielectrics for 6G communication.
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Hiroaki Takeda, Professor Graduate School of Science and Technology, Department of Materials Science, Fundamental Materials Area 【Recent Research Themes】 ● Development of single crystal materials for high-temperature piezoelectric sensors ● Development of microwave dielectric materials for 6G communication ● Single crystallization and property evaluation of lithium-ion battery-related materials ● Synthesis of lithium-ion conductor-insulator composites ● Development of ultra-low resistance PTC thermistors
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【Appeal Points to the Industry】 ● Ownership of various crystal growth equipment such as the Czochralski method, Bridgman method, hydrothermal synthesis method, and floating zone method. ● Advice on single crystallization of desired compounds through the accumulation of know-how in the above crystal growth methods. ● Generation of ideas for the creation of new functional ceramic materials. 【Examples of Practical Use, Applications, and Utilization】 ● Synthesis of langasite-type piezoelectric crystals for combustion pressure sensors (Appl. Phys. Lett. 79, 4201‒4203, 2001, Cryst. Res. Tech. 50, 944‒949, 2015). ● Synthesis of merlinoite-type piezoelectric crystals for high-temperature sensors (Patent 7518827, JP 2014-011327, Appl. Phys. Lett. 102, 242907, 2013). ● Development of lead-free PTC thermistors for heaters (JP 2007-001821, Appl. Phys. Lett. 87, 102104, 2005, ibid. 91, 162904, 2007).
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.