Zol-gel synthesis of SiAlON materials dopped by rare-earth elements

Fourth interdisciplinary scientific forum with international participation "New materials and promising technologies"

Ivicheva, S.N.^1 ; Lysenkov, A.S.^1 ; Ovsyannikov, N.A.^1 ; Kargin, Yu F^1

Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences, Leninskii pr., Moscow

119334, 49, Russia^1

关键词: Aluminum alkoxides;    Chi phase;    Crystalline particles;    Firing temperature;    Gel synthesis;    Hexagonal crystal structure;    Monoclinic structures;    Morphological features;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012084/pdf
DOI  :  10.1088/1757-899X/525/1/012084

来源: IOP

【 摘 要 】

The phase composition and morphological features of i-sialons doped with REE (Eu, Tb, Ce) were studied by nitriding the mixed sol prepared on the basis of silicon and aluminum alkoxides without introducing the corresponding nitrides. It was established that as a result of nitriding of a doped REE mixed Si-Al sol at 1650 °C, the β-SiAlON phases with a hexagonal crystal structure corresponding to β-Si3Al3O3N5 are formed. At a firing temperature of 1700 °C crystalline sialon types corresponding to the χ-phase with a monoclinic structure (Si2Al3O7N and Si6Al10O21N4) are formed. The effect of the addition of red-earth elements on the morphology of crystalline particles of the resulting sialon phases is shown.