Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydrogen annealing modified lanthanum-substituted W-type barium ferrite as well as preparation method and application thereof
The invention discloses hydrogen annealing modified lanthanum-substituted W-type barium ferrite as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing lanthanum-substituted W-type barium ferrite, and carrying out secondary annealing heat treatment on the lanthanum-substituted W-type barium ferrite in a hydrogen-rich atmosphere at the annealing temperature of 100-1000 DEG C for 0.5-10 hours. In the annealing process, on one hand, lattice distortion caused by lanthanum ion substitution can be intensified by high temperature, on the other hand, nickel and oxygen in a part of lattices can be reduced by hydrogen, lattice defects are further intensified, polarization loss of the material to electromagnetic waves can be improved due to generation and intensification of the defects, and the wave absorbing performance of the material is improved; due to the generation of nickel and oxygen vacancies attached to the crystal, the conductivity of the material is enhanced to a certain extent, and the conductivity loss capability of the material to electromagnetic waves is enhanced, so that the loss absorption capability of the W-type barium ferrite (Ba0. 8La. 2Ni2Fe15. 4O27) to the electromagnetic waves can be enhanced by secondary annealing treatment under the hydrogen atmosphere.
本发明公开了一种氢气退火改性镧取代W型钡铁氧体及其制备方法与应用，包括如下步骤：制备镧取代W型钡铁氧体，将镧取代W型钡铁氧体在富氢气气氛下进行二次退火热处理，退火温度为100‑1000℃，退火时间为0.5‑10h。在退火过程中，一方面，高温会加剧由于镧离子取代造成的晶格畸变，另一方面，氢气也会还原一部分晶格中的镍和氧，进一步加剧了晶格缺陷，缺陷的产生和加剧会提高材料对电磁波的极化损耗，提高材料的吸波性能，附在晶体上的镍和氧空位的产生在一定程度上也增强了材料的导电性，对电磁波的电导损耗能力增强，因此氢气气氛下二次退火处理可以增强W型钡铁氧体(Ba0.8La 0.2Ni2Fe15.4O27)对电磁波的损耗吸收能力。
Hydrogen annealing modified lanthanum-substituted W-type barium ferrite as well as preparation method and application thereof
The invention discloses hydrogen annealing modified lanthanum-substituted W-type barium ferrite as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing lanthanum-substituted W-type barium ferrite, and carrying out secondary annealing heat treatment on the lanthanum-substituted W-type barium ferrite in a hydrogen-rich atmosphere at the annealing temperature of 100-1000 DEG C for 0.5-10 hours. In the annealing process, on one hand, lattice distortion caused by lanthanum ion substitution can be intensified by high temperature, on the other hand, nickel and oxygen in a part of lattices can be reduced by hydrogen, lattice defects are further intensified, polarization loss of the material to electromagnetic waves can be improved due to generation and intensification of the defects, and the wave absorbing performance of the material is improved; due to the generation of nickel and oxygen vacancies attached to the crystal, the conductivity of the material is enhanced to a certain extent, and the conductivity loss capability of the material to electromagnetic waves is enhanced, so that the loss absorption capability of the W-type barium ferrite (Ba0. 8La. 2Ni2Fe15. 4O27) to the electromagnetic waves can be enhanced by secondary annealing treatment under the hydrogen atmosphere.
本发明公开了一种氢气退火改性镧取代W型钡铁氧体及其制备方法与应用，包括如下步骤：制备镧取代W型钡铁氧体，将镧取代W型钡铁氧体在富氢气气氛下进行二次退火热处理，退火温度为100‑1000℃，退火时间为0.5‑10h。在退火过程中，一方面，高温会加剧由于镧离子取代造成的晶格畸变，另一方面，氢气也会还原一部分晶格中的镍和氧，进一步加剧了晶格缺陷，缺陷的产生和加剧会提高材料对电磁波的极化损耗，提高材料的吸波性能，附在晶体上的镍和氧空位的产生在一定程度上也增强了材料的导电性，对电磁波的电导损耗能力增强，因此氢气气氛下二次退火处理可以增强W型钡铁氧体(Ba0.8La 0.2Ni2Fe15.4O27)对电磁波的损耗吸收能力。
Hydrogen annealing modified lanthanum-substituted W-type barium ferrite as well as preparation method and application thereof
一种氢气退火改性镧取代W型钡铁氧体及其制备方法与应用
ZENG ZHIHUI (Autor:in) / WANG LONG (Autor:in) / LIU JIURONG (Autor:in) / LIU WEI (Autor:in) / WU NA (Autor:in)
23.02.2024
Patent
Elektronische Ressource
Chinesisch
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