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Hydrothermal synthesis and sol-gel since spread prepared of nano barium ferrite powder

Author: HuangTao
Tutor: HuangYing
School: Northwestern Polytechnical University
Course: Applied Chemistry
Keywords: Ba ferrite nano hydrothermal sol-gel SHS
CLC: TM277
Type: Master's thesis
Year: 2003
Downloads: 468
Quote: 3
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Abstract


Hexa-ferrites have been used widely in the engineering field because of theirs superior performance. Especially, they are characteristic of low price and perfect absorbability, so they can be an important absorbent in Radar Absorbing Materials. Hexa-ferrites are characteristic of ferromagnetism and conductance, so that they can produce magnetic hysteresis loss and electricity loss. Nano-hexa-ferrites are of good absorbents. Because they can not only absorb electromagnetic wave but also deflect and scatter electromagnetic wave, their absorbability was improved. Moreover, the density of nano-hexa-ferrites was reduced, so they are very easily to be applied.The purpose of this paper is to synthesize nano-hexa-ferrites. Comparision with normal materials, Nano-materials have special performance because of their special surface effect, volume effect, and quantum effect. A kind of proper template was found in order to synthesis novel nano-ferrites. Various preparation methods have been used to obtain ferrites. In order to meet the requirement of nano-hexaferrites, hydrothermal method and sol-gel self-propagating high-temperature synthesis method were applied. By studying the effects of different precursors, pH value, temperature and time, the optimum conditions were determined, the structure of crystals was studied by X-diffract aat the same time the morphologic and the diameter of crystals were studied by TEM .

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials
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