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VOLUME 120 (2024) | ISSUE 1 |
PAGE 49
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Structural and magnetic transformations from CuCl to Cu2Cl(OH)3 induced by H2O and CuCl2
D. P. Pimentel
Institute of Physics Gleb Wataghin (IFGW), University of Campinas (UNICAMP), 13083-859 Campinas, Sao Paulo, Brazil Federal Institute of Maranh o, IFMA-PPGEM, Avenida Getúlio Vargas, 4, CEP 65030-005 Sao Luis, MA, Brazil PPGCM-Materials Science and Engineering Graduate Program, UFPI-Federal University of Piaui, 64049-550 Teresina, PI, Brazil
Abstract
This study explores the oxidation dynamics of "pure" CuCl during prolonged
environmental exposure through X-ray diffraction and temperature-dependent
magnetization assessments. While CuCl is traditionally considered diamagnetic, our
investigation reveals the emergence of an antiferromagnetic transition at 4.7 K. This
anomaly is potentially induced by the integration of water molecules into the CuCl
matrix. The hydration process initiates a series of oxidation reactions, ultimately
transmuting CuCl into Cu2Cl(OH)3. Over time, the distinctive diffractogram peaks
corresponding to CuCl diminish, concurrently with the appearance and intensification of
those ascribed to Cu2Cl(OH)3, culminating in a complete phase transition as confirmed
by X-ray analysis. Correspondingly, magnetization measurements clearly discern
magnetic transitions at 6.4 and 16 K, intensifying with the sample's exposure
duration. These findings illuminate the stark potential for probing the magnetic
intricacies of Cu2Cl(OH)3, a subject that remains a compelling and unresolved intrigue
within the field.
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