Reaction synthesis and characterisation of lanthanum silicon nitride

Combustion synthesis of LaSi3N5:Eu2+ phosphor powders

“…The diffraction peaks assigned to LaSi 3 N 5 were a combination of the peaks listed in JCPDS Powder Diffraction File No. 42-1144 and the peaks calculated by Lenčéš et al 17 However, in the XRD patterns of samples Si-1, Si-2 and Si-3, besides the peaks of LaSi 3 N 5 , peaks of Si and LaSi appeared. As shown in Figs.…”

“…Our previous study showed that LaSi 3 N 5 could be synthesized by a slow nitridation method according to the following general reaction: 17 LaSi…”

“…17 In the present study, the design of starting compositions was based on the above-mentioned reaction, and Eu 2 O 3 was added into the starting mixtures to introduce an activator. Therefore, the combustion synthesis reaction can be expressed as:…”

“…17 Later, Cai et al reported that a LaSi 3 N 5 :Ce 3+ phosphor could be synthesized by nitridation of a powder mixture of LaSi + CeSi + Si 3 N 4 at 1600 • C for 2 h. 18 On the other hand, recently we succeeded in synthesizing a ␤-SiAlON:Eu 2+ phosphor by a highly efficient combustion synthesis method. 19 Combustion synthesis, also termed self-propagating hightemperature synthesis (SHS), is based on the high exothermic heat of formation of refractory materials.…”

“…Therefore, combustion synthesis is a time-saving and energy-efficient method. Considering the nitridation reactions of both LaSi and Si are exothermic, 17 it would be worth to investigate whether an Eu-doped LaSi 3 N 5 phosphor could be synthesized by the combustion synthesis method.…”