English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this work, the quasi-spherical β-Si 3 N 4 powders were synthesized via an efficient direct nitridation strategy with CaF 2 as the catalytic material under NH 3 atmosphere. The effect of CaF 2 on phase composition and crystalline morphology was studied. CaF 2 additive can accelerate the nitridation of silicon powders, and the particles of nitridation products tend to have an equiaxed structure with the CaF 2 additive increasing. When 4 wt% CaF 2 additive or more was added, submicron β-Si 3 N 4 particles with quasi-spherical morphology and eminent crystal integrity were obtained. In contrast, irregular α-Si 3 N 4 particles appear as the main phase with less than 4 wt% CaF 2 additive. The growth mechanism of Si 3 N 4 particles was also discussed. CaxSiyOz liquid phase is crucial in the nitridation of silicon powders with CaF 2 additive.

Direct Nitridation Synthesis of Quasi-Spherical β-Si3N4 Powders with CaF2 Additive