%0 Journal Article
%T Impact of Heat Treatments and Hole Density  (p) on the Structural, Electrical, and Superconducting Properties of LnSrBaCu<sub>3</sub>O<sub>6+z</sub> (Ln = Eu, Sm, Nd) Compounds
%A Mohammed Bellioua
%A Mohamed Id El Amel
%A Fatima Bouzit
%A Mohamed Errai
%A Driss Soubane
%A Aderrahim Ait Khlifa
%A Mohammed Khenfouch
%A Issam Mouhti
%A Ahmed Tirbiyine
%A Essediq Youssef El Yakoubi
%A Abdelhakim Nafidi
%J Communications and Network
%P 83-97
%@ 1947-3826
%D 2023
%I Scientific Research Publishing
%R 10.4236/cn.2023.154006
%X In this study, we thoroughly examined the impact of heat treatments and hole count (p) on the properties of LnSrBaCu<sub>3</sub>O<sub>6+z</sub> (Ln = Eu, Sm, Nd) compounds. We focused on preparation, X-ray diffraction with Rietveld refinement, AC susceptibility, DC resistivity measurements, and heat treatment effects. Two heat treatment types were applied: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. As the rare earth Ln¡¯s ionic radius increased, certain parameters notably changed. Specifically, c parameter, surface area S, and volume V increased, while critical temperature Tc and holes (p) in the CuO<sub>2</sub> plane decreased. The evolution of these parameters with rare earth Ln¡¯s ionic radius in [AO] heat treatment is linear. Regardless of the treatment, the structure is orthorhombic for Ln = Eu, tetragonal for Ln = Nd, orthorhombic for Ln = Sm [AO], and pseudo-tetragonal for Sm [O]. The highest critical temperature is reached with Ln = Eu (Tc [AO] = 87.1 K). Notably, for each sample, Tc [AO] surpasses Tc [O]. Observed data stems from factors including rare earth ionic size, improved cationic and oxygen chain order, holes count p in Cu(2)O<sub>2</sub> planes, and in-phase purity of [AO] samples. Our research strives to clearly demonstrate that the density of holes (p) within the copper plane stands as a determinant impacting the structural, electrical, and superconducting properties of these samples. Meanwhile, the other aforementioned parameters contribute to shaping this density (p).
%K High-Tc Superconductors
%K Heat Treatments
%K Hole Density (p)
%K Tc
%K Parameter c
%K Surface ab
%K Electrical Resistance
%K X-Ray Diffraction
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=128012