Preparation, stability and structure of Nd2Cu2O5
Abstract
Nd2Cu2O5 has been synthesized by solid-state reaction of Nd2O3 and CuO at 1010 °C for 4 days. It is thermodynamically stable over a very narrow temperature range, 1002–1012 °C. At higher temperatures, it melts incongruently to Nd2CuO4+ liquid. At lower temperatures, it decomposes to give a mixture of Nd2CuO4 and CuO. Nd2Cu2O5 is isostructural with the stable monoclinic polymorph of La2Cu2O5, as confirmed by partial Rietveld refinement of X-ray powder diffraction data, a= 13.728(2)Å, b= 3.6566(2)Å, c= 27.549(3)Å, β= 105.19(1)°, space group C2/c.
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