Study of the effect of synthesis temperature and thermal aging on structural, dielectric properties and phase composition in NiO/NiAl2O4 composite ceramics

In modern materials science, a considerable amount of research is focused on obtaining new ceramic materials to create efficient functional elements. Acquiring highly efficient and stable ceramic catalysts for alternative energy is an important task that demands an urgent solution. Solving this prob...

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Bibliographic Details
Published in:Materials research express 2024-07, Vol.11 (7), p.075507
Main Authors: Shakirzyanov, Rafael I, Borgekov, Daryn B, Garanin, Yuriy A, Kozlovskiy, Artem L, Volodina, Natalia O, Shlimas, Dmitriy I, Zdorovets, Maxim V
Format: Article
Language:English
Subjects:
Aging
Catalysts
Ceramics
Chemical synthesis
Composition effects
crystalline properties
Dielectric loss
Dielectric properties
efficient functional elements
Grain size
High temperature
high-temperature aging
Materials science
Microstructure
Nickel oxides
NiO/NiAl2O4 ceramics
Parameters
Phase composition
Phase transitions
Renewable energy
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Summary:In modern materials science, a considerable amount of research is focused on obtaining new ceramic materials to create efficient functional elements. Acquiring highly efficient and stable ceramic catalysts for alternative energy is an important task that demands an urgent solution. Solving this problem as fast as possible is essential, as it will facilitate the development of new technologies that can prevent future energy crises. Nickel oxide (NiO) and spinel with the composition NiAl2O4 are excellent candidates as high temperature catalysts used in alternative energy applications. This paper studies the synthesis of NiO/NiAl2O4 composite ceramics and the effect of high-temperature aging on their phase composition, crystalline properties, and dielectric characteristics. The study found that the phase composition and microstructure of the ceramics remain unchanged after several thermal aging cycles at 700 °C. However, the crystalline parameters and low-frequency dielectric characteristics may fluctuate significantly depending on the duration of aging. The observed variations were predominantly influenced by the microstructural features of the composite ceramics. As the average grain size increased and the phase transformations were completed, the crystalline parameters and low-frequency dielectric characteristics reached a stable state without further alteration. For NiO/NiAl2O4 ceramics with a sintering temperature of 1500 °C, the highest shrinkage, low dielectric loss values and acceptable hardness were observed, indicating that the fabricated ceramics are suitable for mechanical processing. In general, the obtained composite ceramics show high temperature stability and are well-suited for use as functional elements in hydrogen energy applications.
ISSN:2053-1591
DOI:10.1088/2053-1591/ad62bf