Ammonia Nitridation Synthesis and Structural Change of Strontium Cyanamide Polymorphs

Abstract

Two strontium cyanamide polymorphs trigonal low temperature phase and orthorhombic high temperature phase were prepared by firing strontium acetate in ammonia flowing at 600-850? C. Trigonal low temperature phase irreversibly changed to orthorhombic high temperature phase by post annealing. The two structures differed in SrN 6 octahedon linkage and NCN 2 arrangement. The structural change was discussed in relation to repulsion between strontium cations and SrN 6 octahedron linkage by corner or edge sharing.

Effect of cationic substitutions on the photoluminescence properties of Eu2+ doped SrCN2 prepared by a facile C3N4 based synthetic approach

“…The sample heated at 800 • C exhibit at first glance phase-pure α-SrCN 2 , however a closer look at the XRD patterns reveals the presence of two extra peak shoulders at ∼ 17.69 • and 28.54 • in 2θ attributed to β-SrCN 2 phase. Such results are in good agreement with the literature which refers to a β → α phase transition between 620 and 700 • C [16,18]. Nevertheless, β-SrCN 2 remains difficult to stabilize without α-SrCN 2 contamination [4,16].…”

Synthesis of perovskite-type oxynitrides SrNb(O,N)3 and CaTa(O,N)3 using carbon nitride

“…In some studies, SrCN2 has been obtained from SrCO3 by heating in a flow of gaseous ammonia at 700 °C. However, the synthesis of phase-pure CaCN2 from CaCO3 under ammonia is challenging, suggesting that the formation of CaCN2 is more difficult than that of SrCN2 [14][15][16]. Because of the presence of SrCN2 as an intermediate, the perovskite phase could be obtained at 800 °C when synthesizing SrTaO2N [8] and SrNb(O,N)3.…”

Reduction of foodborne pathogens during cattle manure composting with addition of calcium cyanamide

“…CaCN 2 has been mainly used as a fertilizer for a long time (Oh et al 2006;Takeda et al 2007;Soltys et al 2011). However, in recent years, several studies reported its fungicidal effect on the pathogens of the soilborne diseases (Bourbos et al 1997;Shi et al 2009).…”