|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Powder and Ceramic Materials Science
||Containerless Processing and Characterization of Potential Host Crystals for Photorefractive Devices
||Elizabeth Hodges, Michael Sansoucie, Robert Hyers
|On-Site Speaker (Planned)
Photorefractive materials have a refractive index changed by exposure to light. Such devices allow control of light by light, enabling new kinds of photonic devices ranging from holographic storage to adaptive optics. Photorefractivity is characteristic of materials that are both photoconductive (light excites mobile charge carriers) and electro-optic (the index of refraction changes under an electric field). Two of the most promising host materials for these devices are Bismuth Sillenite (Bi12SiO20, BSO) and Bismuth Germanate (Bi12GeO20, BGO). It is theorized that the photorefractive properties are caused by a particular crystallographic defect, the Bi on Si antisite defect arising from the formation of metastable clusters in the molten material during the growth of the crystals. Containerless processing of these materials in Electrostatic Levitation (ESL) has allowed the characterization of surface tension, viscosity, density, and phase selection for these materials, for use in improving the quality of crystals that can be grown.