Abstract
The reactions and behavior of La1-xNdxSrCoO4 Ruddlesden-Popper phases were investigated under vacuum and hydrogen atmospheres with varying Nd content (x = 0, 0.25, 0.5, 0.75, 1) and temperatures ranging from 250 to 720°C. Under vacuum (total pressure between 4 and 5 ×10-3 mbar, pO2 = 10-3 mbar), linear thermal expansion is observed up to around 450°C, followed by continuous formation of La1-xNdxSrCoO4-δ phases up to about 700°C, where decomposition into individual oxides (La2O3, Nd2O3, SrO) and Co occurs. La1-xNdxSrCoO4-δ formation starts at lower temperatures with increasing Nd content, and contrary to LaSrCoO4, with addition of Nd, La1-xNdxSrCoO4-δ formation completes before phase decomposition occurs. Under hydrogen atmosphere (5%H2-95%Ar), the reduction reaction La1-xNdxSrCoO4 + δ H2(g) = La1-xNdxSrCoO4-δ + δ H2O(g) initiates at about 300°C and completes around 400°C, yielding the La1-xNdxSrCoO3.5 phase, with higher reactivity observed for x = 0.5 among different Nd contents.
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