The metal oxides MgO, BaO, Al2O3, SiO2, MgO-Al2O3, CaO-Al2O3, SrO-Al2O3, BaO-Al2O3 and MgO-SiO2 have been coated onto ribbons of the Fe-based amorphous alloy Metglas 2605S3A using a set-gel process. The effects of the surface coating on the magnetic properties of the alloy are investigated. The d.c. hysteresis loop for ribbons coated with MgO and MgO-Al2O3 is more square shaped than that for the uncoated ribbon. For ribbons coated with BaO, SrO-Al2O3 and BaO-Al2O3 it is more inclined than for the uncoated ribbon. Significant differences in the frequency dependence of the effective permeability are observed that depend on the nature of the coated oxides. The core loss is also affected by the coating. These results may be explained in terms of a stress induced by the coating and the modification of the domain structure via elastic and/or magnetoelastic interactions. It is thought from the magnetoelastic interactions that the MgO and MgO-Al2O3 coatings induce tensile stresses whilst those of BaO, SrO-Al2O3 and BaO-Al2O3 induce compressive stresses.
An alkali metal-containing, organometallic product, which is hydrocarbon-soluble, is prepared by reacting an organo-alkali metal reactant in which the alkali metal atom is bonded to a carbon atom, e.g. cyclohexyl-lithium, with a di(organooxy)-alkaline earth metal reactant, e.g. di-n-butoxy-magnesium, in an organic solvent at about -20.degree. to +120.degree.C. The organo-alkali metal reactant can be prepared by reacting an organo halide with an alkali metal, and this can be done in situ, i.e. in the presence of the di(organooxy)-alkaline earth metal reactant. The organometallic product has approximately the same chemical reactivity as the organo-alkali metal reactant from which it is prepared, but is more soluble in hydrocarbon solvents.
PhasepureBa(Mg13Ta23O3 (BMT) powders were prepared using Ba metal, Mg(OC2H5)2, and Ta(OC2H5)5 as metal-organic precursors. Thinfilms of BMT were spin coated onto Pt-coated Si(100) substrates using the prepared solution and then fired at various temperatures. The X-ray diffraction patterns show that the films crystallize to a single disordered perovskite phase on Si (100) at ~600 °C. Scanning electron
使用 Ba 金属、Mg(OC2H5)2 和 Ta(OC2H5)5 作为金属有机前驱体制备相纯 Ba(Mg13Ta23O3 (BMT) 粉末。使用 BMT 薄膜旋涂到 Pt 涂层的 Si(100) 基板上制备的溶液,然后在不同温度下烧制。X 射线衍射图表明,薄膜在~600 °C 下在 Si (100) 上结晶成单一无序钙钛矿相。扫描电子显微镜显示薄膜厚度为 0.3 μm,并且大约 0.1 μm 的晶粒尺寸基本无裂纹。