SBIR Phase I: Nanocrystalline Yttrium Iron Garnet (YIG) for Resonance Isolators

这个小企业创新研究第一阶段项目描述了纳米晶钇铁石榴石（YIG）的合成和巩固。YIG是许多高科技设备的重要材料。YIG已广泛应用于多晶、单晶和薄膜形式。其晶体结构为石榴石矿物Mn3Al2Si3O12。Si和Mn被Y和Fe取代，得到Y3Fe5O13。YIG具有有史以来最低的共振线宽，这一特性使其具有重要的商业意义。孔隙、非磁性杂质和微观结构不均匀性的存在使共振线宽变宽，使性能变差。纳米颗粒具有高矫顽力和高饱和磁化强度。它们还提供了比微米级粉末密度更高的能力。Materials Modification, Inc. （MMI）提出合成纳米级YIG粉末，并使用等离子体压力巩固（P2C）技术将其快速固化成完全致密的形状。YIG适用于高频微波应用，如滤波器、振荡器、倍增器、检测器、谐振隔离器和旋转器。

This Small Business Innovative Research Phase I project describes the synthesis and consolidation of nanocrystalline yttrium iron garnet (YIG). YIG is an important material for many high-technology devices. YIG has been used extensively in the polycrystalline, single crystal, and thin film forms. Its crystal structure is that of the garnet mineral Mn3Al2Si3O12. Si and Mn are substituted by Y and Fe to obtain Y3Fe5O13. YIG has the lowest resonance linewidth ever observed, and this property makes it commercially significant. The presence of pores, nonmagnetic impurities and microstructural inhomogeneities broaden the resonance linewidth and deteriorate the properties. Nanoparticles have high coercive force and high saturation magnetization. They also offer the ability to be consolidated into higher densities than micron sized powders. Materials Modification, Inc. (MMI) proposes to synthesize nanosized powders of YIG and rapidly consolidate them using a Plasma Pressure Consolidation (P2C) technique into fully dense shapes.YIG is applicable to high frequency microwave applications such as filters, oscillators, multipliers, detectors, resonance isolators and gyrators.