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Published on: May 12, 2023
La3Pd2NaO9: A High-Valent Insulating Palladate
Qingqing Yang1, Ning Guo2, Tieyan Chang3
1Institute of Crystal Materials, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China.
Abstract:
A high-valent palladate, La3Pd2NaO9, has been synthesized for the first time. Single crystals with dimensions of 20 μm on the edge were successfully grown using the flux method at 420 °C and 70 bar oxygen pressure. Energy dispersive spectroscopy (EDS) and inductively coupled plasma mass spectroscopy (ICP) measurements show that the atomic ratio of La: (Pd + Na) is 3:3 and Pd: Na is 2:1. X-ray photoelectron spectroscopy (XPS) measurements show that the oxidation state of Pd is dominated by the +4. Synchrotron X-ray single-crystal diffraction measurements revealed that this material crystallizes in the monoclinic P21/c space group with charge ordering of Na and Pd. Real-space imaging via scanning transmission electron microscopy (STEM) confirmed the crystal structure and revealed excellent sample homogeneity. Electrical resistivity measurements show an insulating behavior. Magnetic measurements show an unexpected paramagnetic behavior, which probably originates from a small fraction of high-spin Pd2+ evidenced by XPS. The successful growth of La3Pd2NaO9 single crystals with a high-valent oxidation state of Pd offers an approach for exploring interesting palladates, including potential bilayer Ruddlesden-Popper palladates analogous to the high temperature superconducting La3Ni2O7.
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