Strontium ferrites

Considering the high solubility of strontium hydroxide in water. Fang et al. [304] developed a two-microemulsion method for the synthesis of strontium ferrite. 

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Flexible Magnets. Flexible magnets are made by embedding ferrimagnetic ceramics in a polymer matrix, such as barium ferrite or strontium ferrite in nylon or... 

Using high levels (90% by weight) of magnetic strontium ferrite filler particles in a polyamide 6 matrix, procedures have been described for structuring the... 

Although the dioxide FcOa has not been isolated with certainty, derivatives such as strontium ferrite,4 Sr0.Fe02, and barium ferrite, UaO.Fo()a, are known, corresponding to the manganites. Ferrates,5 corresponding in composition to the manganates, have also been obtained, the most stable of which is the barium salt, BaFe04. 

For magnetic applications, the use of strontium ferrite powder has been characterised (234). The use of barium ferrite has been optimised (362). 

Strontium ferrite perovskite. The nonstoiehiometric strontium ion oxide SrFeOx (2.5solid state electrolyte itself, doped with rare earths or transition metals, it forms materials, whieh exhibit even greater ionie conductivity. These oxides are used as materials for self-supported oxygen conduetivity membranes. 

Made from barium ferrite, BaO Fe203, or strontium ferrite, SrO- Fe203 Used as refrigerator magnets brittle, relatively lightweight, and inexpensive... 

Typical fillers carbon black, calcium carbonate, dolomite, clays, calcinated clays, talc, soapstone, zinc oxide, filmed silica, borates, iron oxide, zinc oxide, magnesium carbonate, pulverized polyurethane foam, barium and strontium ferrites, magnesium aluminum silicate, nylon fibers, quartz in EMI shielding field silver plated aluminum, silver plated nickel, silver coated glass spheres, silver plated copper, silver, nickel and carbon black... 

Typical concentration range carbon black - 20-30 wt%, calcium carbonate, quartz, talc - 15-25 wt%, silica - 15-30 wt%, titanium dioxide - 5 wt%, zinc oxide - 3-5 wt%, magnesium aluminum silicate - 20-40 wt%, barium or strontium ferrite (magnetic fillers) - 15-35 wt%. pulverized polyurethane foam -15-30 wt%... 

In general, it can be concluded that all modified and thin film samples prevent rapid recombination, while CB-Ti02 films and ri02/strontium ferrite samples have the advantage of easy separation because of their fixation on the support. 

W. Fu, H. Yang, L. Chang, H-Bala, M. Li, G. Zou, Anatase Ti02 nanolayer coating on strontium ferrite nanoparticles for magnetic photocatalyst , CoUoids and Surfaces A Physicochemical Engineering Aspects, 289, 47-52, (2006). 

It has been established that the introduction of small amounts (0.5-2 wt%) of a ferromagnetic matter (barium ferrite or strontium ferrite powder) significantly intensifies the saturation of Cl in the polymer matrix. With this aim, extruded hose filled with the ferrite is treated in the contact zone... 

Strontium ferrite SrO-6Fe2O3 doped with various oxides was studied. The oxides were added in order to control calcination processes and to fabricate the magnetic material with required structure and morphology of grains. However, besides of the introduced oxides the target sample can contain some impurities, which occur in the feed stock, e.g. in kaolin. According to emission analysis the... 

Synthesis of ultrafine particles of strontium ferrite by chemical coprecipitation with sodium hydroxide. In Advances in Ferrites Proceedings of... 

Fan, X. Matijevic, E. (1988). Preparation of uniform colloidal strontium ferrite particles. Journal of the American Ceramic Society, 71, C-60-2. 

Chen, D.H., Chen, Y.Y. Synthesis of strontium ferrite nanoparticles by coprecipitation in the presence of polyacrylic acid. Mater. Res. BuU. 37, 801-810 (2002)... 

D. H. Chen and Y. Y. Chen, Synthesis of strontium ferrite ultrafine particles using microemulsion... 

Thermal conductivity studies have been conducted on a wide range of filled polymers and composites including carbon-fibres [2,37-43], aluminium powder [40], aluminium nitride [41], magnetite, barite, talc, copper, strontium, ferrite [42], glass fibre filled PP [44] and manganese and/or iron filled polyaniline [42]. 

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