OXINITRIDED COMPOSITION BASED ON AN ALKALINE EARTH AND TANTALUM OR ON AN ALKALINE EARTH AND NIOBIUM, PREPARATION METHODS AND USE AS DYEING PIGMENT

摘要

The invention concerns an oxinitrided composition based on an alkaline earth and at least one element selected between tantalum and niobium, characterised in that it has a global composition corresponding to formula (1): A1+yM1-yO¿(7-3y-6x)/2?N2x in which A represents an alkaline earth, M represents tantalum or niobium or one of these two elements partially substituted by the other and y and x verify the following equations: 0.33≤y≤0.5 and 0∫x≤(7-3y)/6. The invention also concerns a composition based on strontium and tantalum and/or niobium characterised in that it has a global composition corresponding to formula (2): Sr1+yM1-yO¿(7-3y)/2? in which M is defined as above and 0.33∫y∫0.5. The oxinitrided composition can be used as dyeing pigment.