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

Environmentally Benign Synthesis and Color Tuning of Strontium–Tantalum Perovskite Oxynitride and Its Solid Solutions

“…Preparation of metal oxynitrides through nitridation of a metal oxide precursor using solid nitriding agents, such as C 3 N 4 and urea, is reportedly a safe and simple method that does not use gaseous NH 3 . Masubuchi et al reported on the preparation of perovskite oxynitrides using C 3 N 4 . , Giordano et al reported on the synthesis of tantalum oxynitrides and nitrides by a Ca-assisted urea method . Gomathi and Rao reported the preparation of various metal oxynitrides through a urea-based route .…”

“…Masubuchi et al reported on the preparation of perovskite oxynitrides using C 3 N 4 . 47,48 Giordano et al reported on the synthesis of tantalum oxynitrides and nitrides by a Ca-assisted urea method. 49 Gomathi and Rao reported the preparation of various metal oxynitrides through a urea-based route.…”

Non-ammonolysis synthesis and characterisation of environmentally benign yellow pigments based on calcium–tantalum perovskite oxynitrides

“…It should be noted that the generation of CaCN 2 was not observed under any conditions in a previous study of the preparation of CaTa(O,N) 3 by using C 3 N 4 . 36 Both are methods for the preparation of oxynitrides by using solid nitriding agents, but the nitridation processes with C 3 N 4 and urea presumably differ. The colour of this product was pale yellow (Fig.…”

“…In the context of these circumstances, several approaches for eliminating the use of toxic NH 3 gas by using solid nitriding agents for metal oxynitride synthesis have been proposed. [31][32][33][34][35][36][37][38] We recently developed a urea-nitriding method for synthesizing metal oxynitrides, namely GaN : ZnO and LaTiO 2 N, and the nitriding mechanisms were elucidated. 39,40 The shorter heat-treatment duration compared with those in processes that involve ammonolysis achieved a reduction in energy consumption and enabled the formation of finer sample powders.…”

“…There have been several reports on the synthesis of CaTa(O,N) 3 through a non-ammonolysis process, e.g., calcination of CaCO 3 and TaON, 31 and nitridation of Ca 2 Ta 2 O 7 with C 3 N 4 . 36 However, because of the presence of raw material residues and the generation of by-products, single-phase synthesis of calciumtantalum perovskite oxynitrides has not been achieved. In addition, a detailed colour evaluation of the products was not carried out in either of these reports.…”