Oxygen Reduction Effect on T’-Pr2-xCexCuO4 Nanopowders in the Underdoped Regime Studied by X-Ray Absorption near Edge Structure

Resky Irfanita; Putu Eka Dharma Putra; Triono Bambang; Chatree Saiyasombat; Kamonsuangkasem Krongthong; Malik Anjelh Baqiya; Darminto Darminto

doi:10.4028/www.scientific.net/MSF.936.93

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Oxygen Reduction Effect on T’-Pr_2-_xCe_xCuO₄ Nanopowders in the Underdoped Regime Studied by X-Ray Absorption near Edge Structure

Abstract:

This research is aimed to examine oxidation state of Copper (Cu) in both as-synthesized and reduced T’-Pr_2-_xCe_xCuO₄ (T’-PCCO) with x = 0, 0.10, and 0.15 using Cu K-edge x-ray absorption near edge structure (XANES). The T‘-PCCO nanopowders were successfully synthesized by the chemically dissolved method with HNO₃ as a dissolving agent continued by calcination at 1000°C for 15 h. The reduced T’-PCCO nanopowders were obtained by reduction annealing process at 700°C for 5 h under Ar gas atmosphere. The analyses of XANES spectra show that oxidation states of the Cu ions in all of the T'-PCCO nanopowders have values between +1 and +2. This indicates the existence of electron doping in the CuO₂ planes, even in the undoped T’-structure. It is found that the oxidation states of the Cu ions change after reduction annealing depending on the existence of apical oxygen in the T'-structure. Based on the XANES analyses, it is revealed that the change of oxidation state is influenced by the presence of both electron and hole carriers in the two-carrier model of T’-structure.