Utilizing various methods to grow bulk single crystals of functional inorganic materials!
Manufacturing (Saitama University Research Seed Collection 2025-27 p.44)
Keywords: inorganic materials, bulk single crystals, crystal engineering, Czochralski method, Bridgman method, floating zone melting method, flux method, optical materials
In a certain substance, a state where atoms are arranged in a regular periodic manner in three dimensions is called a crystal, while compounds without periodicity are referred to as amorphous (such as glass). Furthermore, a substance is only called a "material" when it is used for human purposes. Our research group focuses on functional inorganic materials such as oxides and halides (especially iodides), conducting research on "bulk single crystals" where the periodic arrangement of atoms is organized over millimeters to centimeters. We primarily engage in the growth of bulk single crystals of inorganic materials with electrical and optical functions, as well as crystal structure analysis, physical property evaluation, and characterization. By using bulk single crystals, it is possible to exhibit special functions that reflect the crystal structure or evaluate physical properties unique to single crystals. The lineup of crystal growth methods is also diverse, allowing for the selection of appropriate growth methods based on the chemical properties, melting points, and sizes of the substances (two Czochralski furnaces, two vertical Bridgman furnaces, one floating zone melting method, one resistance heating micro-pulling furnace, and flux slow-cooling method).
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Shohei Kodama, Assistant Professor Graduate School of Science and Engineering, Department of Materials Science, Fundamental Materials Area 【Recent Research Themes】 ● Development of near-infrared emitting oxide scintillators ● Material exploration for high light output oxide neutron scintillators ● Crystal growth of ultra-high melting point oxides using the Czochralski method ● Development of optically anisotropic crystals based on real gemstones
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【Appeal Points to the Industry】 ● We can compare various crystal growth methods for testing. ● We have a setup that allows for the evaluation of mechanical, electrical, and optical properties. ● We are exploring optimal crystals through crystal structure analysis and various property evaluations. ● Through research on scintillators (materials for radiation sensors), we are also collaborating with the radiation and nuclear power fields. 【Examples of Practical Applications, Case Studies, and Utilization】 ● Development of red-emitting scintillators for monitoring at the Fukushima Daiichi Nuclear Power Plant. ● Flux growth of silicate single crystals for neutron detection. ● Establishment of low-cost and simple raw material powder pretreatment technology.
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Red-emitting halide crystals grown by the vertical Bridgman method.
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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.