Low temperature in situ formation of cobalt in silicon nitride toward functional nitride nanocomposites †

Shotaro Tada , Maira Debarba Mallmann , Haruna Takagi , Junya Iihama , Norifumi Asakuma , Toru Asaka , Yusuke Daiko , Sawao Honda , Rafael Kenji Nishihora , Ricardo Antonio Francisco Machado , Samuel Bernard (1) , Yuji Iwamoto

1 IRCER-AXE4 - IRCER - Axe 4 : céramiques sous contraintes environnementales

This work highlights the first demonstration of a low-temperature in situ formation of Co nanocrystallites embedded within an amorphous silicon nitride matrix through careful control of the chemistry behind material design using perhydropolysilazane (PHPS) as a Si3N4 precursor further coordinated with CoCl2 and ammonia as a pyrolysis atmosphere. The Co nucleation was allowed to proceed at temperatures as low as 400 8C via thermal decomposition of Co2N pre-formed in situ by the reaction of CoCl2 with the Si centers of PHPS at the early stage of pyrolysis (220-350 8C).

Domaines: Chimie

Shotaro Tada, Maira Debarba Mallmann, Haruna Takagi, Junya Iihama, Norifumi Asakuma, et al.. Low temperature in situ formation of cobalt in silicon nitride toward functional nitride nanocomposites †. Chemical Communications, 2021, 57 (16), pp.2057-2060. ⟨10.1039/d0cc07366k⟩. ⟨hal-03157706⟩