Phase diagram and transition temperatures in the system (T-T’) La2-xNdxCuO4 (x ≤ 0.5)

Mohamed Ikbal Houchati (1, 2, 3) , Adnene Midouni (1) , Mondher Yahya (1) , Nassira Chniba-Boudjada (4) , Jean-François Bardeau (5) , Ahmed Hichem Hamzaoui (1)

1 CNRSM - Centre National de Recherches en Sciences des Matériaux [Soliman, Tunisie]
2 Université de Gabès
3 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
4 NEEL - MRS - Matériaux, Rayonnements, Structure
5 IMMM - Institut des Molécules et Matériaux du Mans

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.

Mots clés: Topotactic reaction; Temperature-dependent powder; X-ray diffraction; Phase transition; Calcium hydride; EPR spectroscopy; Raman spectroscopy

Domaines: Chimie-Physique [physics.chem-ph]; Physique Générale [physics.gen-ph]; Matériaux

Mohamed Ikbal Houchati, Adnene Midouni, Mondher Yahya, Nassira Chniba-Boudjada, Jean-François Bardeau, et al.. Phase diagram and transition temperatures in the system (T-T’) La2-xNdxCuO4 (x ≤ 0.5). Inorganic Chemistry Communications, 2021, 132, pp.108845. ⟨10.1016/j.inoche.2021.108845⟩. ⟨hal-03326564⟩