The paper presents for the first time a new version of the solution combustion synthesis with applications in the CaO·6Al₂O₃ direct formation, without any additional thermal treatments. The starting point was the premise - confirmed in our previous results - that there is a predilection of metal nitrates with respect to certain fuels.

The used raw materials were: Ca(NO₃)₂·4H₂O, Al(NO₃)₃·9H₂O, urea, glycine and β-alanine. The experimental determinations evidenced that glycine or β-alanine lead to the formation of an amorphous reaction product, whereas urea leads to the formation of a phase mixture consisting of CaO·6Al₂O₃ and α-Al₂O₃.

On the other hand, the use of a stoechiometric fuel mixture containing urea and β-alanine alongside the desired metal nitrates ensures the straight formation of a pure, well-crystallized CaO·6Al₂O₃, without any subsequent calcination step. The experimental results prove that the version we suggested - the use of a fuel mixture - is definitely better than the traditional version of the combustion synthesis, based on using a single fuel.

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