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article
Phase diagram and transition temperatures in the system (T-T’) La2-xNdxCuO4 (x ≤ 0.5)
Abstract
La2-xNdxCuO3.5 (x ≤ 0.5) compounds have been synthesized by a topotactic reduction reaction with calcium hydride at 280 °C for 48 h. Structural, thermal, vibrational and magnetic properties of La2-xNdxCuO3.5 (x ≤ 0.5) were studied by X-ray powder diffraction (XRD), by differential thermal analysis (DTA) and temperature dependent powder X ray diffraction (TDXD), by Raman spectroscopy and by electronic paramagnetic resonance. The oxidation of the compounds La2-xNdxCuO3.5 (x ≤ 0.5) at 400 °C for 24 h kinetically stabilizes the compounds La2-xNdxCuO4 (x ≤ 0.5) with an I4/mmm type structure. The phase relationship between T’ and T, ensured at high temperature, was followed and discussed by thermal and structural analysis.