Perovskite-type oxynitrides

The choice of conducting substrate becomes more difficult when postdeposition high-temperature treatments are necessary. This is often the case for complex oxides, such as perovskites or oxynitrides [9], which may require firing at temperatures above 600°C in order to obtain the desired crystalline phase. This prohibits the use of float glass, which softens above 550°C. Certain types of borosilicate glass can be used up to 650 C, while fused silica or sapphire can withstand continuous exposure to temperatures up to 950°C. Unfortunately, the conductivity of ITO films quickly decreases above 350°C. FTO and ITO/FTO coatings are stable up to 600-700 C [2,10], and may still have acceptable conductivities at higher temperatures provided... 

Perovskite-type LaTi02N oxynitrides for solar water splitting influence of the synthesis conditions. Energy Procedia, 22, 61-66. 

Formation of rare-earth-containing oxynitride perovskites AB03 rNx must, after introduction of R atoms in site A, comply with the relation a + i = 6+x, in which a and h are the respective charges of A- and B-type atoms. It can be seen that the sum (a + b), which can range in a continuous way between 6 and 9, allows various possibilities of substitution. These are discussed in the following paragraphs. 

RTi02N (R = La, Nd), RTaON2 (R=La-Dy) and LaNbON2 oxynitrides (Marchand et al. 1991b) were prepared at 950°C by reaction between ammonia and the corresponding ternary oxides, and were characterized as orthorhombic perovskites of the GdFe03-type (Muller and Roy 1974). The slight deformation, which induces the loss of cubic... 

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