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

这个小型企业创新研究第一阶段项目描述了纳米晶Y铁石榴石(YIG)的合成和固结。YIG是许多高科技器件的重要材料。YIG已被广泛应用于多晶、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拥有迄今观察到的最低共振线宽，这一特性使其具有重要的商业意义。气孔、非磁性杂质和微结构不均匀的存在加宽了共振线宽，使性能变差。纳米颗粒具有高的矫顽力和高的饱和磁化强度。它们还提供了固化成比微米级粉末更高密度的能力。材料改性公司(MMI)建议合成YIG纳米粉末，并使用等离子体压力固结(P2C)技术将其快速固结为完全致密的形状。YIG适用于高频微波应用，如滤波器、振荡器、倍增器、探测器、谐振器和回转器。

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.